Non-LTE analysis of four PG1159 stars

Details Non-LTE analysis of four PG1159 stars Non-LTE analysis of four PG1159 stars

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...244..437w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 244, no. 2, April 1991, p. 437-461.

Astronomy and Astrophysics

Astrophysics

153

Nonequilibrium Thermodynamics, Photosphere, Spectrum Analysis, Stellar Atmospheres, White Dwarf Stars, Carbon, Helium, Hot Stars, Oxygen, Radiative Transfer, Stellar Composition

Scientific paper

A spectral analysis of four members of the PG1159 class is performed. These stars are believed to be very hot pre-White Dwarf stars. It is shown that the photospheres of PG1159 stars are dominated by helium and carbon and that a significant amount of oxygen is present. It is also found that the nonradial pulsations observed in some PG1159 stars are driven by the cyclic ionization of carbon and oxygen.

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