GU Monocerotis: A high-mass eclipsing overcontact binary in the young open cluster Dolidze 25
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Título: | GU Monocerotis: A high-mass eclipsing overcontact binary in the young open cluster Dolidze 25 |
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Autor/es: | Lorenzo Espinosa, Javier | Negueruela, Ignacio | Vilardell Sallés, Francesc | Simón Díaz, Sergio | Pastor Seva, Pedro | Méndez Majuelos, Manuel |
Grupo/s de investigación o GITE: | Astrofísica Estelar (AE) |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal |
Palabras clave: | Stars: distances | Binaries: spectroscopic | Stars: fundamental parameters | Binaries: eclipsing | Binaries: close |
Área/s de conocimiento: | Astronomía y Astrofísica |
Fecha de publicación: | 10-may-2016 |
Editor: | EDP Sciences |
Cita bibliográfica: | Astronomy & Astrophysics. 2016, 590: A45. doi:10.1051/0004-6361/201628224 |
Resumen: | Context. The eclipsing binary GU Mon is located in the star-forming cluster Dolidze 25, which has the lowest metallicity measured in a Milky Way young cluster. Aims. GU Mon has been identified as a short-period eclipsing binary with two early B-type components. We set out to derive its orbital and stellar parameters. Methods. We present a comprehensive analysis, including B and V light curves and 11 high-resolution spectra, to verify the orbital period and determine parameters. We used the stellar atmosphere code FASTWIND to obtain stellar parameters and create templates for cross-correlation. We obtained a model to fit the light and radial-velocity curves using the Wilson-Devinney code iteratively and simultaneously. Results. The two components of GU Mon are identical stars of spectral type B1 V with the same mass and temperature. The light curves are typical of an EW-type binary. The spectroscopic and photometric analyses agree on a period of 0.896640 ± 0.000007 d. We determine a mass of 9.0 ± 0.6 M⊙ for each component and for temperatures of 28 000 ± 2000 K. Both values are consistent with the spectral type. The two stars are overfilling their respective Roche lobes, sharing a common envelope and, therefore the orbit is synchronised and circularised. Conclusions. The GU Mon system has a fill-out factor above 0.8, containing two dwarf B-type stars on the main sequence. The two stars are in a very advanced stage of interaction, with their extreme physical similarity likely due to the common envelope. The expected evolution of such a system very probably leads to a merger while still on the main sequence. |
Patrocinador/es: | This research is partially supported by the Spanish Ministerio de Economía y Competitividad under grants AYA2012-39364-C02-01/02 and AYA2015-68012-C2-1/2, and the European Union. |
URI: | http://hdl.handle.net/10045/54867 |
ISSN: | 0004-6361 (Print) | 1432-0746 (Online) |
DOI: | 10.1051/0004-6361/201628224 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © ESO 2016 |
Revisión científica: | si |
Versión del editor: | http://dx.doi.org/10.1051/0004-6361/201628224 |
Aparece en las colecciones: | INV - Astrofísica Estelar - Artículos de Revistas |
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2016_Lorenzo_etal_A&A.pdf | 869,42 kB | Adobe PDF | Abrir Vista previa | |
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