The case of Alpha Centauri - Mass, age and p-mode oscillation spectrum

Details The case of Alpha Centauri - Mass, age and p-mode oscillation spectrum The case of Alpha Centauri - Mass, age and p-mode oscillation spectrum

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...300..773d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 300, Jan. 15, 1986, p. 773-778.

Astronomy and Astrophysics

Astrophysics

60

Binary Stars, Centaurus Constellation, Stellar Evolution, Stellar Mass, Stellar Oscillations, Stellar Structure, Stellar Cores, Stellar Luminosity, Stellar Models, Stellar Parallax, Sun

Scientific paper

The authors have investigated the astrometric and physical properties of the α Centauri system, a nearby visual binary which shares a common space motion with the nearest star Proxima Cen. First, the parallax of the binary system is estimated to be 0arcsec.7506±0arcsec.0046 (s.e.). Using this absolute parallax, the masses of α Cen A and B are respectively 1.09±0.01 and 0.90±0.01 M_sun;. Second, the evolutionary status of α Cen A and B is determined with the help of theoretical stellar models. Evolutionary tracks yield the age of the α Cen system as a function of metallicity. The discussion points to a consistent model with an age in the vicinity of 4 - 4.5×109yr. Third, the nonradial oscillations of α Cen A are considered. The p-mode spectrum of the models of α Cen A is compared to that of the Sun and to the observations of Fossat et al. It is concluded that Fossat et al.'s observations are inconsistent with p-mode spectra constructed from standard theoretical models.

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