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Population and Evolution of Pulsating A-F Stars

Published online by Cambridge University Press:  07 August 2017

Jiang Shiyang
Affiliation:
Beijing Astronomical Observatory, Beijing, 100080, China
Liu Yanying
Affiliation:
Beijing Astronomical Observatory, Beijing, 100080, China

Extract

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Pulsating A-F variables include all the stellar types listed in teh Table, as well as the pulsating white dwarfs. Stars near the zero-age-main-sequence have faster rotation velocity, which slows as expected with age (Villata 1992) and a smaller amplitude of light variation, so we suggest that rotation velocity be considered in Population classifications. Also, in the Galaxy, the galactic rotation constant A is related to stellar age T by: A(kms−1kpc−1) = (−2.4±0.8)T(109yr) + (32±2) (Kharchenko 1992). The linear rotation velocity is also a function of the Z coordinate of the object inside the Galaxy: the mean Z-gradient is −10kms−1kpc−1 (Malakhova & Petrovskaya, 1992). Thus the population is strongly correlated with the rotation velocity and the evolutionary age.

Type
Poster Papers
Copyright
Copyright © Kluwer 1995 

References

Villata, M., 1992, MNRAS 258, 107 Google Scholar
Kharchenko, N.V., 1992, Kinematics Phys. Celest. Bodies, 8, 8 Google Scholar
Malakhova, Yu. N. and Petrovskaya, I.V., 1992, Kinematics Phys. Celest. Bodies, 8, 8 Google Scholar