Using nonradial pulsations to determine the envelope composition of very evolved stars
Conference
·
OSTI ID:6753195
Recent observational and theoretical studies of the ZZ Ceti variables (DA degenerate dwarfs), the DBV variables (DB degenerate dwarfs), and the GW Vir variables (DO degenerate dwarfs) have shown them to be pulsating in nonradial g/sup +/-modes. The pulsation mechanism has been identified for each class of variable star and, in all cases, involves predictions of the stars envelope composition. The ZZ Ceti variables must have pure hydrogen surface layers, the DBV stars must have pure helium surface layers, and the GW Vir stars must have carbon and oxygen rich surface layers. 44 refs.
- Research Organization:
- Los Alamos National Lab., NM (USA); Joint Inst. for Lab. Astrophysics, Boulder, CO (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6753195
- Report Number(s):
- LA-UR-86-3684; CONF-860793-4; ON: DE87001982
- Country of Publication:
- United States
- Language:
- English
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