Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...247..941s&link_type=abstract
Astrophysical Journal, Part 1, vol. 247, Aug. 1, 1981, p. 941-948.
Astronomy and Astrophysics
Astrophysics
17
Blue Stars, Giant Stars, Stellar Models, Stellar Oscillations, Variable Stars, Light Curve, Lyra Constellation, Opacity, Stellar Luminosity, Stellar Mass, Stellar Motions, Stellar Temperature
Scientific paper
The full-amplitude behaviour of theoretical models of RR Lyr stars pulsating in the fundamental mode has been explored with the use of Carson's radiative opacities. A detailed comparison of the models with metal-poor RR Lyr stars of Bailey types a and b suggests that these stars have properties that lie somewhere in the following ranges: mass/solar mass = 0.55-0.65, Y = 0.2 0.3, and log (luminosity/solar luminosity) = 1.6-1.7. In obtaining these results, the only data that are used are velocity curves and light curves. Independent information, however, seems to corroborate the values found here. The use of Los Alamos opacities gives somewhat similar results, although the derived masses are smaller by about 20%.
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