Article (Scientific journals)
Calibration of the Alpha Centauri system - Metallicity and age
Noels-Grötsch, Arlette; Grevesse, Nicolas; Magain, Pierre et al.
1991In Astronomy and Astrophysics, 247, p. 91-94
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Keywords :
METALLICITY; SOLAR NEIGHBORHOOD; STELLAR EVOLUTION; ABUNDANCE; BINARY STARS; HERTZSPRUNG-RUSSELL DIAGRAM; MILKY WAY GALAXY
Abstract :
[en] The binary system Alpha Cen A and B, with its well known parallax, its high quality orbit and the reasonable hypothesis of a common origin and age for both components, is a useful test of stellar evolution models. Evolutionary sequences are computed for 1.085 and 0.9 solar masses with different values of Z, Y and alpha (= l/Hp). Adopting luminosities and effective temperatures as derived from the observations, Z = 0.04, Y = 0.32, alpha = 1.6 and t = 5 Gyr. The Z-value derived from evolutionary sequences is very sensitive to the difference in effective temperature between the two components.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Noels-Grötsch, Arlette ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Grevesse, Nicolas ;  Département d'astrophys., géophysique et océanographie (AGO)
Magain, Pierre  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Neuforge, Corinne
Baglin, A.;  Meudon, Observatoire, France
Lebreton, Y.;  Meudon, Observatoire, France
Language :
English
Title :
Calibration of the Alpha Centauri system - Metallicity and age
Publication date :
01 July 1991
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
247
Pages :
91-94
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 04 March 2010

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