IUE and Voyager observations of very hot O-type subdwarfs

Details IUE and Voyager observations of very hot O-type subdwarfs IUE and Voyager observations of very hot O-type subdwarfs

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349..249d&link_type=abstract

In NASA. Goddard Space Flight Center Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 249-253 (SEE N85-20961 1

Astronomy and Astrophysics

Astronomy

O Stars, Stellar Composition, Stellar Temperature, Subdwarf Stars, Ultraviolet Spectra, Carbon, Helium, Hertzsprung-Russell Diagram, Hydrogen, Iue, Nitrogen, Spaceborne Astronomy, Stellar Evolution, Voyager 1 Spacecraft

Scientific paper

Twelve newly-discovered subdwarf O stars were observed with IUE and complementary observations of two of these were obtained with Voyager 1. It was found that these stars all have effective temperatures of at least 60,000 K and that they occupy a region in the H-R diagram between the hottest white dwarfs and the central stars of planetary nebulae, i.e., that they are the hottest known O-type subdwarfs. Evidence that the abundances of H, He, C, N, and possibly Fe vary widely from star to star is presented. It is believed that these stars represent the state of evolution immediately preceding the white dwarf state, and that the abundance differences are due to diffusion and convective mixing in surface layers.

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