Population I pulsating stars. III - Period-Evolutionary mass(-colour) relations

Details Population I pulsating stars. III - Period-Evolutionary mass(-colour) relations Population I pulsating stars. III - Period-Evolutionary mass(-colour) relations

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ap%26ss.128..319t&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 128, no. 2, Dec. 1986, p. 319-339.

Astronomy and Astrophysics

Astrophysics

9

Stellar Color, Stellar Evolution, Stellar Mass, Stellar Oscillations, Cepheid Variables, Mass Ratios

Scientific paper

Evolutionary masses of Population I pulsating stars (89 Delta Scuti variables and 155 classical Cepheids are investigated in Iben's and Paczynski's systems of tracks. The evolutionary masses are larger in the latter system than in the former. The uncertainty of the evolutionary mass of a star is estimated, when various evolutionary phases are possible for this star (a smaller evolutionary mass corresponds to a later phase). Semi-empirical period-evolutionary mass-color (P-Me-C) and period-evolutionary mass (P-Me) relations are derived for various modes, groups of stars, color indices (and effective temperature), and evolutionary phases. For Delta Scuti stars, the uncertainty of evolutionary masses calculated from the P-Me relations for different modes, is estimated. The improvement of the evolutionary mass accuracy is estimated, when a P-Me-C relation is used instead of the corresponding P-Me relation. The theoretical and semi-empirical period ratios of radial pulsations derived from the P-Me relations for Delta Scuti stars, are compared. There is relatively good agreement between the P-Me relations for the two types of Population I pulsating stars, but a 'gap' exists between them.

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