Calibration of the Alpha Centauri system - Metallicity and age

Details Calibration of the Alpha Centauri system - Metallicity and age Calibration of the Alpha Centauri system - Metallicity and age

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...247...91n&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 247, no. 1, July 1991, p. 91-94.

Astronomy and Astrophysics

Astrophysics

33

Metallicity, Solar Neighborhood, Stellar Evolution, Abundance, Binary Stars, Hertzsprung-Russell Diagram, Milky Way Galaxy

Scientific paper

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.

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