Population I pulsating stars. II - Period-age (-colour) relations

Details Population I pulsating stars. II - Period-age (-colour) relations Population I pulsating stars. II - Period-age (-colour) relations

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ap%26ss.127..219t&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 127, no. 2, Nov. 1986, p. 219-247.

Astronomy and Astrophysics

Astrophysics

11

Pre-Main Sequence Stars, Stellar Evolution, Stellar Oscillations, Variable Stars, Cepheid Variables, Color-Magnitude Diagram, Magnetohydrodynamic Stability, Stellar Mass, Stellar Temperature

Scientific paper

Ages corresponding to various evolutionary phases of population I pulsating stars (89 Delta Scuti variables and 155 classical cepheids) are interpolated in the evolutionary track systems of Iben (1967) and Paczynski (1970). The stellar ages are considerably less in the latter system than in the former one. The undertainty of the age of a star is estimated when various evolutionary phases are possible for this star (a greater age corresponds to a later phase). Semiempirical period-age-color (P-t-C) and period-age (P-1) relations are derived for various modes, groups of stars, color indices (and effective temperature), and evolutionary phases. For Delta Scuti stars, the uncertainty of ages calculated from the P-t relations for different modes, is estimated. Theoretical P-t-C and P-t relations for Delta Scuti stars are obtained and compared with semiempirical relations (such a comparison of P-t relations is performed for classical cepheids too). The improvement of the age accuracy is estimated when a P-t-C relation is used instead of the corresponding P-t relation. The theoretical and semiempirical period ratios of radial pulsations, derived from the P-t relations for Delta Scuti stars, are compared. There is relatively good agreement between the P-t relations for the two types of population I pulsating stars, but a 'gap' exists between them.

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