Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...222..541h&link_type=abstract
Astrophysical Journal, Part 1, vol. 222, June 1, 1978, p. 541-546.
Astronomy and Astrophysics
Astronomy
4
Early Stars, Planetary Nebulae, Stellar Coronas, Stellar Spectra, Stellar Winds, Ultraviolet Astronomy, Far Ultraviolet Radiation, O Stars, Oao 3, Satellite Observation, Stellar Atmospheres, Stellar Evolution
Scientific paper
Copernicus UV observations of O VI in early-type stars are used to infer the existence of coronae or hot stellar winds. Attention is given to the optical doublet of O VI at wavelengths 3811 and 3834, which is seen in the spectra of some central stars in planetary nebulae, and taken to be evidence of a coronal wind. It is noted (from observations of NGC 6751) that hot gas in the coronal model produces radiation at energies above 54 eV, which can affect He II Zanstra temperatures. He(+) ionizing radiation in population I early-type stars is also taken as an indication of hot winds.
Hartmann Lee
Raymond John C.
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