Masses and luminosities of population II cepheids.
Abstract
Mean luminosities, effective temperatures, and radii of 11 Population II Cepheids are derived from three color photometry and, in some cases, radial velocities. From a comparison of the observed and the theoretical period-radius relation masses of 0.55 I 0.05 are derived for all Population II Cepheids except the variables No. 1 and 2 in M13, which appear to be less massive and possibly helium-rich. The period-luminosity relation is also discussed. Subject headings: Cepheids and W Virginis stars - globular clusters - luminosities - mass loss
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 1974
- DOI:
- 10.1086/153229
- Bibcode:
- 1974ApJ...194..125B