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dc.contributor.author Collado, Ana Elisa
dc.contributor.author Gamen, Roberto Claudio
dc.contributor.author Barba, Rodolfo Hector
dc.contributor.author Morrell, Nidia Irene
dc.date.available 2017-02-02T21:54:58Z
dc.date.issued 2015-09
dc.identifier.citation Collado, Ana Elisa; Gamen, Roberto Claudio; Barba, Rodolfo Hector; Morrell, Nidia Irene; A new massive double-lined spectroscopic binary system: The Wolf-Rayet star WR68a; Edp Sciences; Astronomy And Astrophysics; 581; 9-2015; 49-53
dc.identifier.issn 0004-6361
dc.identifier.uri http://hdl.handle.net/11336/12436
dc.description.abstract Double-lined spectroscopic binary systems, containing a Wolf-Rayet and a massive O-type star, are key objects for the study of massive star evolution because these kinds of systems allow the determination of fundamental astrophysical parameters of their components. We have performed spectroscopic observations of the star WR 68a as part of a dedicated monitoring program of WR stars to discover new binary systems. We identified spectral lines of the two components of the system and disentangled the spectra. We measured the radial velocities in the separated spectra and determined the orbital solution. We discovered that WR 68a is a double-lined spectroscopic binary with an orbital period of 5.2207 days, very small or null eccentricity, and inclination ranging between 75 and 85 deg. We classified the binary components as WN6 and O5.5-6. The WN star is less massive than the O-type star with minimum masses of 15 ± 5 M⊙ and 30 ± 4 M⊙, respectively. The equivalent width of the He ii λ4686 emission line shows variations with the orbital phase, presenting a minimum when the WN star is in front of the system. The light curve constructed from available photometric data presents minima in both conjunctions of the system.
dc.format application/pdf
dc.language.iso eng
dc.publisher Edp Sciences
dc.rights info:eu-repo/semantics/openAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject Spectroscopic
dc.subject Wolf-Rayet
dc.subject WR 68a
dc.subject fundamental parameters
dc.subject.classification Astronomía
dc.subject.classification Ciencias Físicas
dc.subject.classification CIENCIAS NATURALES Y EXACTAS
dc.title A new massive double-lined spectroscopic binary system: The Wolf-Rayet star WR68a
dc.type info:eu-repo/semantics/article
dc.type info:ar-repo/semantics/artículo
dc.type info:eu-repo/semantics/publishedVersion
dc.date.updated 2017-01-11T13:26:25Z
dc.journal.volume 581
dc.journal.pagination 49-53
dc.journal.pais Francia
dc.journal.ciudad Les Ulis
dc.description.fil Fil: Collado, Ana Elisa. Consejo Nacional de Investigaciones Cienti­ficas y Tecnicas. Centro Cientifico Tecnologico San Juan. Instituto de Ciencias Astronomicas de la Tierra y del Espacio; Argentina. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Fisicas y Naturales; Argentina
dc.description.fil Fil: Gamen, Roberto Claudio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
dc.description.fil Fil: Barba, Rodolfo Hector. Universidad de la Serena; Chile. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil Fil: Morrell, Nidia Irene. Carnegie Observatories; Chile. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.journal.title Astronomy And Astrophysics
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1051/0004-6361/201424863
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/url/http://www.aanda.org/articles/aa/abs/2015/09/aa24863-14/aa24863-14.html


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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)