ORBi: Noels-Grötsch Arlette - Calibration of the Alpha Centauri system

Reference : Calibration of the Alpha Centauri system - Metallicity and age


	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
	To cite this reference:	http://hdl.handle.net/2268/41067

Title :	Calibration of the Alpha Centauri system - Metallicity and age
Language :	English
Author, co-author :	Noels-Grötsch, Arlette [Université de Liège - ULg > 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 - ULg > 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]
Publication date :	1-Jul-1991
Journal title :	Astronomy and Astrophysics
Publisher :	EDP Sciences
Volume :	247
Pages :	91-94
Audience :	International
ISSN :	0004-6361
e-ISSN :	1432-0746
City :	Les Ulis
Country :	France
Keywords :	[en] 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.
Permalink :	http://hdl.handle.net/2268/41067
Other URL :	http://adsabs.harvard.edu/abs/1991A%26A...247...91N
Mentions required by the publisher for OA :	The authors thank EDP Sciences for their deposit authorization.

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