The Secondary Component of the Extremely Low Mass Ratio Massive Binary HD 165246 Revealed by GHOST

Autores: Rodriguez, Cinthya Nazarena; Ansín, Tomás; Ferrero, G. A.; Benvenuto, Omar Gustavo; Gamen, Roberto Claudio; Morrell, Nidia Irene; Arias, J. I.; Higa, Rebeca Elízabeth; Putkuri, Cristina Ester; Johnston, C.; Chiboucas, K.; Deibert, E.; Hayes, C. R.; Heo, J. E.; Jeong, M.; Kalari, V.; Martioli, E.; Placco, V. M.; Venn, K. A.; Xu, S.; Diaz, R.; Gomez Jimenez, M.; Ruiz Carmona, R.; Simpson, C.; McConnachie, A. W.; Pazder, J.; Burley, G.; Berg, T. A. M.; Robertson, J. G.; Labrie, K.; Thomas Osip, J.
Año de publicación: 2025
Idioma: inglés
Tipo de recurso: artículo
Estado: versión publicada
Descripción: In the pursuit of understanding the multiplicity of massive stars, the OWN Survey has undertaken spectroscopic monitoring of hundreds of targets over the past 20 yr. This effort has led to the discovery of new single-lined spectroscopic binaries. Characterizing the unseen companions of these systems is crucial to deriving precise stellar parameters, including the mass of each component, and constraining formation models for massive binary systems. In this paper, we aim to physically and evolutionarily characterize the stellar components of the massive binary HD 165246. We analyzed spectra obtained by the OWN Survey and used Kepler´s second mission (K2) photometry, from which we determined the physical parameters of the system. Thanks to the high-resolution capabilities of the new echelle spectrograph Gemini/GHOST, we could directly detect spectral features of the secondary component for the first time. A very low mass ratio for the system is confirmed (q ~ 0.16), making this binary one of the few extremely low mass ratio systems known. The primary star has a mass of Ma = 22 ± 1 M⊙ and a radius of Ra = 7.0 ± 0.1 R⊙, while the secondary star has a mass of Mb = 3.4 ± 0.1 M⊙ and a radius of Rb = 2.22 ± 0.02 R⊙. Stellar evolution models indicate that the system has undergone approximately two million years of evolution since its formation. Moreover, the secondary star is identified as a pre-main-sequence object, progressing toward the zero-age main sequence. This paper illustrates the power of high-resolution spectrographs such as GHOST in finding much lower mass, previously unseen stellar components of binary star systems.
Fil: Rodriguez, Cinthya Nazarena. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Ansín, Tomás. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Ferrero, G. A.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Benvenuto, Omar Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Gamen, Roberto Claudio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Morrell, Nidia Irene. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Arias, J. I.. Universidad de La Serena; Chile
Fil: Higa, Rebeca Elízabeth. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Putkuri, Cristina Ester. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Johnston, C.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Chiboucas, K.. Radboud University Nijmegen; Bélgica
Fil: Deibert, E.. International Gemini Observatory; Chile
Fil: Hayes, C. R.. International Gemini Observatory; Chile
Fil: Heo, J. E.. International Gemini Observatory; Chile
Fil: Jeong, M.. International Gemini Observatory; Chile
Fil: Kalari, V.. International Gemini Observatory; Chile
Fil: Martioli, E.. International Gemini Observatory; Chile
Fil: Placco, V. M.. International Gemini Observatory; Chile
Fil: Venn, K. A.. International Gemini Observatory; Chile
Fil: Xu, S.. International Gemini Observatory; Chile
Fil: Diaz, R.. International Gemini Observatory; Chile
Fil: Gomez Jimenez, M.. International Gemini Observatory; Chile
Fil: Ruiz Carmona, R.. International Gemini Observatory; Chile
Fil: Simpson, C.. International Gemini Observatory; Chile
Fil: McConnachie, A. W.. International Gemini Observatory; Chile
Fil: Pazder, J.. International Gemini Observatory; Chile
Fil: Burley, G.. International Gemini Observatory; Chile
Fil: Berg, T. A. M.. International Gemini Observatory; Chile
Fil: Robertson, J. G.. International Gemini Observatory; Chile
Fil: Labrie, K.. International Gemini Observatory; Chile
Fil: Thomas Osip, J.. International Gemini Observatory; Chile
Materia: Massive stars
Early-type stars
Fundamental parameters of stars
Eclipsing binary stars
Nivel de accesibilidad: acceso abierto
Condiciones de uso: https://creativecommons.org/licenses/by/2.5/ar/
Repositorio
Institución: Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador: oai:ri.conicet.gov.ar:11336/290891

Acceder

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spelling	The Secondary Component of the Extremely Low Mass Ratio Massive Binary HD 165246 Revealed by GHOSTRodriguez, Cinthya NazarenaAnsín, TomásFerrero, G. A.Benvenuto, Omar GustavoGamen, Roberto ClaudioMorrell, Nidia IreneArias, J. I.Higa, Rebeca ElízabethPutkuri, Cristina EsterJohnston, C.Chiboucas, K.Deibert, E.Hayes, C. R.Heo, J. E.Jeong, M.Kalari, V.Martioli, E.Placco, V. M.Venn, K. A.Xu, S.Diaz, R.Gomez Jimenez, M.Ruiz Carmona, R.Simpson, C.McConnachie, A. W.Pazder, J.Burley, G.Berg, T. A. M.Robertson, J. G.Labrie, K.Thomas Osip, J.Massive starsEarly-type starsFundamental parameters of starsEclipsing binary starshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1In the pursuit of understanding the multiplicity of massive stars, the OWN Survey has undertaken spectroscopic monitoring of hundreds of targets over the past 20 yr. This effort has led to the discovery of new single-lined spectroscopic binaries. Characterizing the unseen companions of these systems is crucial to deriving precise stellar parameters, including the mass of each component, and constraining formation models for massive binary systems. In this paper, we aim to physically and evolutionarily characterize the stellar components of the massive binary HD 165246. We analyzed spectra obtained by the OWN Survey and used Kepler´s second mission (K2) photometry, from which we determined the physical parameters of the system. Thanks to the high-resolution capabilities of the new echelle spectrograph Gemini/GHOST, we could directly detect spectral features of the secondary component for the first time. A very low mass ratio for the system is confirmed (q ~ 0.16), making this binary one of the few extremely low mass ratio systems known. The primary star has a mass of Ma = 22 ± 1 M⊙ and a radius of Ra = 7.0 ± 0.1 R⊙, while the secondary star has a mass of Mb = 3.4 ± 0.1 M⊙ and a radius of Rb = 2.22 ± 0.02 R⊙. Stellar evolution models indicate that the system has undergone approximately two million years of evolution since its formation. Moreover, the secondary star is identified as a pre-main-sequence object, progressing toward the zero-age main sequence. This paper illustrates the power of high-resolution spectrographs such as GHOST in finding much lower mass, previously unseen stellar components of binary star systems.Fil: Rodriguez, Cinthya Nazarena. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: Ansín, Tomás. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: Ferrero, G. A.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: Benvenuto, Omar Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: Gamen, Roberto Claudio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: Morrell, Nidia Irene. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: Arias, J. I.. Universidad de La Serena; ChileFil: Higa, Rebeca Elízabeth. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: Putkuri, Cristina Ester. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: Johnston, C.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: Chiboucas, K.. Radboud University Nijmegen; BélgicaFil: Deibert, E.. International Gemini Observatory; ChileFil: Hayes, C. R.. International Gemini Observatory; ChileFil: Heo, J. E.. International Gemini Observatory; ChileFil: Jeong, M.. International Gemini Observatory; ChileFil: Kalari, V.. International Gemini Observatory; ChileFil: Martioli, E.. International Gemini Observatory; ChileFil: Placco, V. M.. International Gemini Observatory; ChileFil: Venn, K. A.. International Gemini Observatory; ChileFil: Xu, S.. International Gemini Observatory; ChileFil: Diaz, R.. International Gemini Observatory; ChileFil: Gomez Jimenez, M.. International Gemini Observatory; ChileFil: Ruiz Carmona, R.. International Gemini Observatory; ChileFil: Simpson, C.. International Gemini Observatory; ChileFil: McConnachie, A. W.. International Gemini Observatory; ChileFil: Pazder, J.. International Gemini Observatory; ChileFil: Burley, G.. International Gemini Observatory; ChileFil: Berg, T. A. M.. International Gemini Observatory; ChileFil: Robertson, J. G.. International Gemini Observatory; ChileFil: Labrie, K.. International Gemini Observatory; ChileFil: Thomas Osip, J.. International Gemini Observatory; ChileIOP Publishing2025-02info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/290891Rodriguez, Cinthya Nazarena; Ansín, Tomás; Ferrero, G. A.; Benvenuto, Omar Gustavo; Gamen, Roberto Claudio; et al.; The Secondary Component of the Extremely Low Mass Ratio Massive Binary HD 165246 Revealed by GHOST; IOP Publishing; Astrophysical Journal; 980; 2; 2-2025; 1-120004-637XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://iopscience.iop.org/article/10.3847/1538-4357/ada892info:eu-repo/semantics/altIdentifier/doi/10.3847/1538-4357/ada892info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2026-08-25T14:31:48Zoai:ri.conicet.gov.ar:11336/290891instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982026-08-25 14:31:48.606CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv	The Secondary Component of the Extremely Low Mass Ratio Massive Binary HD 165246 Revealed by GHOST
title	The Secondary Component of the Extremely Low Mass Ratio Massive Binary HD 165246 Revealed by GHOST
spellingShingle	The Secondary Component of the Extremely Low Mass Ratio Massive Binary HD 165246 Revealed by GHOST Rodriguez, Cinthya Nazarena Massive stars Early-type stars Fundamental parameters of stars Eclipsing binary stars
title_short	The Secondary Component of the Extremely Low Mass Ratio Massive Binary HD 165246 Revealed by GHOST
title_full	The Secondary Component of the Extremely Low Mass Ratio Massive Binary HD 165246 Revealed by GHOST
title_fullStr	The Secondary Component of the Extremely Low Mass Ratio Massive Binary HD 165246 Revealed by GHOST
title_full_unstemmed	The Secondary Component of the Extremely Low Mass Ratio Massive Binary HD 165246 Revealed by GHOST
title_sort	The Secondary Component of the Extremely Low Mass Ratio Massive Binary HD 165246 Revealed by GHOST
dc.creator.none.fl_str_mv	Rodriguez, Cinthya Nazarena Ansín, Tomás Ferrero, G. A. Benvenuto, Omar Gustavo Gamen, Roberto Claudio Morrell, Nidia Irene Arias, J. I. Higa, Rebeca Elízabeth Putkuri, Cristina Ester Johnston, C. Chiboucas, K. Deibert, E. Hayes, C. R. Heo, J. E. Jeong, M. Kalari, V. Martioli, E. Placco, V. M. Venn, K. A. Xu, S. Diaz, R. Gomez Jimenez, M. Ruiz Carmona, R. Simpson, C. McConnachie, A. W. Pazder, J. Burley, G. Berg, T. A. M. Robertson, J. G. Labrie, K. Thomas Osip, J.
author	Rodriguez, Cinthya Nazarena
author_facet	Rodriguez, Cinthya Nazarena Ansín, Tomás Ferrero, G. A. Benvenuto, Omar Gustavo Gamen, Roberto Claudio Morrell, Nidia Irene Arias, J. I. Higa, Rebeca Elízabeth Putkuri, Cristina Ester Johnston, C. Chiboucas, K. Deibert, E. Hayes, C. R. Heo, J. E. Jeong, M. Kalari, V. Martioli, E. Placco, V. M. Venn, K. A. Xu, S. Diaz, R. Gomez Jimenez, M. Ruiz Carmona, R. Simpson, C. McConnachie, A. W. Pazder, J. Burley, G. Berg, T. A. M. Robertson, J. G. Labrie, K. Thomas Osip, J.
author_role	author
author2	Ansín, Tomás Ferrero, G. A. Benvenuto, Omar Gustavo Gamen, Roberto Claudio Morrell, Nidia Irene Arias, J. I. Higa, Rebeca Elízabeth Putkuri, Cristina Ester Johnston, C. Chiboucas, K. Deibert, E. Hayes, C. R. Heo, J. E. Jeong, M. Kalari, V. Martioli, E. Placco, V. M. Venn, K. A. Xu, S. Diaz, R. Gomez Jimenez, M. Ruiz Carmona, R. Simpson, C. McConnachie, A. W. Pazder, J. Burley, G. Berg, T. A. M. Robertson, J. G. Labrie, K. Thomas Osip, J.
author2_role	author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author
dc.subject.none.fl_str_mv	Massive stars Early-type stars Fundamental parameters of stars Eclipsing binary stars
topic	Massive stars Early-type stars Fundamental parameters of stars Eclipsing binary stars
purl_subject.fl_str_mv	https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv	In the pursuit of understanding the multiplicity of massive stars, the OWN Survey has undertaken spectroscopic monitoring of hundreds of targets over the past 20 yr. This effort has led to the discovery of new single-lined spectroscopic binaries. Characterizing the unseen companions of these systems is crucial to deriving precise stellar parameters, including the mass of each component, and constraining formation models for massive binary systems. In this paper, we aim to physically and evolutionarily characterize the stellar components of the massive binary HD 165246. We analyzed spectra obtained by the OWN Survey and used Kepler´s second mission (K2) photometry, from which we determined the physical parameters of the system. Thanks to the high-resolution capabilities of the new echelle spectrograph Gemini/GHOST, we could directly detect spectral features of the secondary component for the first time. A very low mass ratio for the system is confirmed (q ~ 0.16), making this binary one of the few extremely low mass ratio systems known. The primary star has a mass of Ma = 22 ± 1 M⊙ and a radius of Ra = 7.0 ± 0.1 R⊙, while the secondary star has a mass of Mb = 3.4 ± 0.1 M⊙ and a radius of Rb = 2.22 ± 0.02 R⊙. Stellar evolution models indicate that the system has undergone approximately two million years of evolution since its formation. Moreover, the secondary star is identified as a pre-main-sequence object, progressing toward the zero-age main sequence. This paper illustrates the power of high-resolution spectrographs such as GHOST in finding much lower mass, previously unseen stellar components of binary star systems. Fil: Rodriguez, Cinthya Nazarena. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina Fil: Ansín, Tomás. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina Fil: Ferrero, G. A.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina Fil: Benvenuto, Omar Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina Fil: Gamen, Roberto Claudio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina Fil: Morrell, Nidia Irene. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina Fil: Arias, J. I.. Universidad de La Serena; Chile Fil: Higa, Rebeca Elízabeth. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina Fil: Putkuri, Cristina Ester. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina Fil: Johnston, C.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina Fil: Chiboucas, K.. Radboud University Nijmegen; Bélgica Fil: Deibert, E.. International Gemini Observatory; Chile Fil: Hayes, C. R.. International Gemini Observatory; Chile Fil: Heo, J. E.. International Gemini Observatory; Chile Fil: Jeong, M.. International Gemini Observatory; Chile Fil: Kalari, V.. International Gemini Observatory; Chile Fil: Martioli, E.. International Gemini Observatory; Chile Fil: Placco, V. M.. International Gemini Observatory; Chile Fil: Venn, K. A.. International Gemini Observatory; Chile Fil: Xu, S.. International Gemini Observatory; Chile Fil: Diaz, R.. International Gemini Observatory; Chile Fil: Gomez Jimenez, M.. International Gemini Observatory; Chile Fil: Ruiz Carmona, R.. International Gemini Observatory; Chile Fil: Simpson, C.. International Gemini Observatory; Chile Fil: McConnachie, A. W.. International Gemini Observatory; Chile Fil: Pazder, J.. International Gemini Observatory; Chile Fil: Burley, G.. International Gemini Observatory; Chile Fil: Berg, T. A. M.. International Gemini Observatory; Chile Fil: Robertson, J. G.. International Gemini Observatory; Chile Fil: Labrie, K.. International Gemini Observatory; Chile Fil: Thomas Osip, J.. International Gemini Observatory; Chile
description	In the pursuit of understanding the multiplicity of massive stars, the OWN Survey has undertaken spectroscopic monitoring of hundreds of targets over the past 20 yr. This effort has led to the discovery of new single-lined spectroscopic binaries. Characterizing the unseen companions of these systems is crucial to deriving precise stellar parameters, including the mass of each component, and constraining formation models for massive binary systems. In this paper, we aim to physically and evolutionarily characterize the stellar components of the massive binary HD 165246. We analyzed spectra obtained by the OWN Survey and used Kepler´s second mission (K2) photometry, from which we determined the physical parameters of the system. Thanks to the high-resolution capabilities of the new echelle spectrograph Gemini/GHOST, we could directly detect spectral features of the secondary component for the first time. A very low mass ratio for the system is confirmed (q ~ 0.16), making this binary one of the few extremely low mass ratio systems known. The primary star has a mass of Ma = 22 ± 1 M⊙ and a radius of Ra = 7.0 ± 0.1 R⊙, while the secondary star has a mass of Mb = 3.4 ± 0.1 M⊙ and a radius of Rb = 2.22 ± 0.02 R⊙. Stellar evolution models indicate that the system has undergone approximately two million years of evolution since its formation. Moreover, the secondary star is identified as a pre-main-sequence object, progressing toward the zero-age main sequence. This paper illustrates the power of high-resolution spectrographs such as GHOST in finding much lower mass, previously unseen stellar components of binary star systems.
publishDate	2025
dc.date.none.fl_str_mv	2025-02
dc.type.none.fl_str_mv	info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo
format	article
status_str	publishedVersion
dc.identifier.none.fl_str_mv	http://hdl.handle.net/11336/290891 Rodriguez, Cinthya Nazarena; Ansín, Tomás; Ferrero, G. A.; Benvenuto, Omar Gustavo; Gamen, Roberto Claudio; et al.; The Secondary Component of the Extremely Low Mass Ratio Massive Binary HD 165246 Revealed by GHOST; IOP Publishing; Astrophysical Journal; 980; 2; 2-2025; 1-12 0004-637X CONICET Digital CONICET
url	http://hdl.handle.net/11336/290891
identifier_str_mv	Rodriguez, Cinthya Nazarena; Ansín, Tomás; Ferrero, G. A.; Benvenuto, Omar Gustavo; Gamen, Roberto Claudio; et al.; The Secondary Component of the Extremely Low Mass Ratio Massive Binary HD 165246 Revealed by GHOST; IOP Publishing; Astrophysical Journal; 980; 2; 2-2025; 1-12 0004-637X CONICET Digital CONICET
dc.language.none.fl_str_mv	eng
language	eng
dc.relation.none.fl_str_mv	info:eu-repo/semantics/altIdentifier/url/https://iopscience.iop.org/article/10.3847/1538-4357/ada892 info:eu-repo/semantics/altIdentifier/doi/10.3847/1538-4357/ada892
dc.rights.none.fl_str_mv	info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/2.5/ar/
eu_rights_str_mv	openAccess
rights_invalid_str_mv	https://creativecommons.org/licenses/by/2.5/ar/
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dc.publisher.none.fl_str_mv	IOP Publishing
publisher.none.fl_str_mv	IOP Publishing
dc.source.none.fl_str_mv	reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas
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repository.mail.fl_str_mv	dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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The Secondary Component of the Extremely Low Mass Ratio Massive Binary HD 165246 Revealed by GHOST

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