CALIBRATION OF THE ALPHA-CENTAURI SYSTEM - METALLICITY AND AGE

被引：0

作者：

NOELS, A ^{[1
]}

GREVESSE, N ^{[1
]}

MAGAIN, P ^{[1
]}

NEUFORGE, C ^{[1
]}

BAGLIN, A ^{[1
]}

LEBRETON, Y ^{[1
]}

机构：

[1] OBSERV MEUDON, DASGAL, F-92190 MEUDON, FRANCE

来源：

ASTRONOMY & ASTROPHYSICS | 1991年 / 247卷 / 01期

关键词：

GALAXY; (THE); SOLAR NEIGHBORHOOD; STARS; ABUNDANCES; EVOLUTION; HR DIAGRAM; ALPHA-CEN; STANDARD SOLAR MODEL; OSCILLATION;

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The binary system alpha Cen A and B, with its well known parallaxe, 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. We computed evolutionary sequences for 1.085 M(.) and 0.9 M(.) with different values of Z, Y and alpha-( = l/Hp). Adopting luminosities and effective temperatures as derived from the observations, we find Z = 0.04, Y = 0.32, alpha = 1.6 and t = 5 Gyr. We also show that the Z-value derived from evolutionary sequences is very sensitive to the difference in effective temperature between the two components.

引用

页码：91 / 94

页数：4

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