The Evolutionary Status of β Cephei Stars.
Abstract
Use is made of the evolutionary tracks for stars of 10.1 and 15. SM presented at this Meeting by Demarque, Morris, and Percy. Following Schmalberger (Astrophys. J. 132, 591, 1960), the coincidence in the H-R diagram of the phase of hydrogen exhaustion in the core and the position of the p Cephei stars is emphasized. The effective ratio of specific heats in our models is found to be close to but somewhat below the value of 1.6 found by Chandrasekhar and Lebovitz (Astrophys. J. 136, 1105, 1962) to explain the nonradial pulsation models of p Canis Majoris. Changes in the period of adiabatic pulsation with time are also investigated and compared with observation.
- Publication:
-
The Astronomical Journal
- Pub Date:
- 1965
- DOI:
- 10.1086/109638
- Bibcode:
- 1965AJ.....70S.136D