Using nonradial pulsations to determine the envelope composition of very evolved stars

Details Using nonradial pulsations to determine the envelope composition of very evolved stars Using nonradial pulsations to determine the envelope composition of very evolved stars

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ana..work..163s&link_type=abstract

Presented at the 2nd IAP Recontre on Nuclear Astrophysics, Paris, France, 7 Jul. 1986

Astronomy and Astrophysics

Astrophysics

Dwarf Stars, Late Stars, Stellar Envelopes, Stellar Evolution, Carbon, Helium, Hydrogen, Oxygen, Unsteady Flow

Scientific paper

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 (+)-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.

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