A new spectroscopic analysis of the massive O + O type binary HD 54662 AB

HD 54662 AB is one of the three O + OB binaries known so far with orbital period longer than 1000 d, offering the opportunity to test scenarios of massive star formation and models of single stellar evolution. Here, we present a detailed study of this system based on new high-resolution spectra and...

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Autores principales:	Barbá, Rodolfo Héctor, Sabín Sanjulián, C., Arias, Julia Inés, Gamen, Roberto Claudio, Morrell, Nidia Irene, Ferrero Sosa, Gabriel Antonio, Maíz Apellániz, J., Putkuri, Cristina Ester, Simón Díaz, S., Boyajian, Tabetha S., Fullerton, Alexander W., McSwain, M. V.
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2020
Materias:	Astronomía stars: atmospheres binaries: spectroscopic stars: early-type stars: fundamental parameters stars: individual: HD 54662 AB
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/124887
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-124887
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Astronomía stars: atmospheres binaries: spectroscopic stars: early-type stars: fundamental parameters stars: individual: HD 54662 AB
spellingShingle	Astronomía stars: atmospheres binaries: spectroscopic stars: early-type stars: fundamental parameters stars: individual: HD 54662 AB Barbá, Rodolfo Héctor Sabín Sanjulián, C. Arias, Julia Inés Gamen, Roberto Claudio Morrell, Nidia Irene Ferrero Sosa, Gabriel Antonio Maíz Apellániz, J. Putkuri, Cristina Ester Simón Díaz, S. Boyajian, Tabetha S. Fullerton, Alexander W. McSwain, M. V. A new spectroscopic analysis of the massive O + O type binary HD 54662 AB
topic_facet	Astronomía stars: atmospheres binaries: spectroscopic stars: early-type stars: fundamental parameters stars: individual: HD 54662 AB
description	HD 54662 AB is one of the three O + OB binaries known so far with orbital period longer than 1000 d, offering the opportunity to test scenarios of massive star formation and models of single stellar evolution. Here, we present a detailed study of this system based on new high-resolution spectra and data. A disentangling method is used to recover the individual spectra of the primary and secondary components, which are classified as O6.5 V(n)z and O7.5 Vz, respectively. Combining radial velocity measurements and astrometric data, a new absolute orbit with a period of 2113 ± 9 d and an eccentricity of 0.062 ± 0.008 is determined, confirming previous findings. However, absolute masses of 23.8 ± 1.1 M⊙ for the primary and 20.3 ± 1.1 M⊙ for the secondary are obtained, differing from previous determinations but in reasonable agreement with the spectral types of the stars. Primary and secondary components show remarkably different projected rotational velocities (160 and ≲ 40 km s⁻¹, respectively), which is probably related to the formation process of the binary. Contrary to previously interpretations, the star with broader spectral features is the most massive object in the system. Stellar and wind parameters of both stars are derived through quantitative spectroscopic analysis of the disentangled spectra using FASTWIND models, and they are consistent with the current calibrations for O-type stars. Evolutionary masses and ages are also computed with the BONNSAI tool. Ages below 2.5 Ma are obtained, in agreement with the youth expected from their Vz nature.
format	Articulo Articulo
author	Barbá, Rodolfo Héctor Sabín Sanjulián, C. Arias, Julia Inés Gamen, Roberto Claudio Morrell, Nidia Irene Ferrero Sosa, Gabriel Antonio Maíz Apellániz, J. Putkuri, Cristina Ester Simón Díaz, S. Boyajian, Tabetha S. Fullerton, Alexander W. McSwain, M. V.
author_facet	Barbá, Rodolfo Héctor Sabín Sanjulián, C. Arias, Julia Inés Gamen, Roberto Claudio Morrell, Nidia Irene Ferrero Sosa, Gabriel Antonio Maíz Apellániz, J. Putkuri, Cristina Ester Simón Díaz, S. Boyajian, Tabetha S. Fullerton, Alexander W. McSwain, M. V.
author_sort	Barbá, Rodolfo Héctor
title	A new spectroscopic analysis of the massive O + O type binary HD 54662 AB
title_short	A new spectroscopic analysis of the massive O + O type binary HD 54662 AB
title_full	A new spectroscopic analysis of the massive O + O type binary HD 54662 AB
title_fullStr	A new spectroscopic analysis of the massive O + O type binary HD 54662 AB
title_full_unstemmed	A new spectroscopic analysis of the massive O + O type binary HD 54662 AB
title_sort	new spectroscopic analysis of the massive o + o type binary hd 54662 ab
publishDate	2020
url	http://sedici.unlp.edu.ar/handle/10915/124887
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A new spectroscopic analysis of the massive O + O type binary HD 54662 AB

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