Physics
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...239..186d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 239, no. 1-2, Nov. 1990, p. 186-192. Research supported by SNSF.
Physics
31
Early Stars, Stellar Oscillations, Stellar Physics, Variable Stars, Abundance, Astronomical Photometry, Interstellar Extinction, Metallicity
Scientific paper
On the basis of the Walraven VBLUW photometry data reported by Diethelm (1986) on 57 pulsating variables with periods between one and three days, primary parameters (metallicity, log g, Teff, and the amount of reddening) were deduced for 11 of these stars, using a semiempirical approach based on model atmosphere calculations. Results indicate that both the C-delta and the SA-class of the pulsating variables are young stars of the disc-population pulsating either in the fundamental (C-delta) or in the first overtone mode (SA). The AHB1 stars, which showed a marked deficiency in metal abundance, are members of the halo populaton. The stars of the AHB2 and AHB3 groups, which show an intermediate metallicity, must be considered as members of an intermediate stellar population.
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