Discovery of oxygen in the PG 1159 degenerate stars - A direct evolutionary link to O VI planetary nebula nuclei and confirmation of pulsation theory

Details Discovery of oxygen in the PG 1159 degenerate stars - A direct evolutionary link to O VI planetary nebula nuclei and confirmation of pulsation theory Discovery of oxygen in the PG 1159 degenerate stars - A direct evolutionary link to O VI planetary nebula nuclei and confirmation of pulsation theory

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...292..471s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 292, May 15, 1985, p. 471-476.

Astronomy and Astrophysics

Astrophysics

50

Oxygen Spectra, Planetary Nebulae, Stellar Composition, Stellar Evolution, Stellar Oscillations, Stellar Spectra, White Dwarf Stars, Absorption Spectra, Emission Spectra, Stellar Envelopes, Stellar Luminosity, Stellar Mass, Stellar Temperature

Scientific paper

The discovery of strong O VI absorption/emission lines in five members of the PG 1159 degenerate stars is reported. It is shown that the optical spectra are dominated by C IV, O VI, and He II, with no detectable N lines. It is confirmed that the planetary nebula-central star, K1-16, which is found to be a pulsating star by Grauer and Bond (1984), is a member of the spectroscopic group. The detection of strong oxygen features in the photospheres of the objects provides support of the prediction of Starrfield et al. (1984). The properties of the PG 1159 stars are compared with the so-called O VI central stars of planetary nebulae and both groups of stars are found to have similar spectral features, temperatures, and luminosities. The implications of the O VI/PG 1159 evolutionary link are assessed.

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