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RS Cha, a spectroscopic binary system as a test of stellar physics modeling during the pre-main sequence phase
Alecian, E.; Catala, C.; Goupil, Marie-José et al.
2005In SF2A-2005: Semaine de l'Astrophysique Francaise
 

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Abstract :
[en] New spectra of the PMS eclipsing binary RS Cha obtained with the GIRAFFE spectrograph at the SAAO, allowed us to measure the metallicity and new masses of both components of RS Cha. The system is therefore observationally well constrained, and modelling both stars (both with masses around 1.8 M[SUB]o[/SUB]) at the same (young) age is a severe challenge for stellar evolutionary codes. We find no evidence that our models are deficient. However accurate detection of modes and measurements of periods of the recently discovered pulsations in both components are required to constrain more severely the physical description of PMS stellar models.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Alecian, E.
Catala, C.
Goupil, Marie-José
Lebreton, Y.
Dupret, Marc-Antoine ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique
Language :
English
Title :
RS Cha, a spectroscopic binary system as a test of stellar physics modeling during the pre-main sequence phase
Publication date :
01 December 2005
Audience :
International
Main work title :
SF2A-2005: Semaine de l'Astrophysique Francaise
Pages :
299
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since 11 November 2010

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