A compact planetary nebula around the hot white dwarf EGB 6/PG 0950 + 139

Details A compact planetary nebula around the hot white dwarf EGB 6/PG 0950 + 139 A compact planetary nebula around the hot white dwarf EGB 6/PG 0950 + 139

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...346..251l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 346, Nov. 1, 1989, p. 251-264. Research supported by NSERC.

Astronomy and Astrophysics

Astrophysics

30

Planetary Nebulae, Stellar Evolution, Stellar Spectrophotometry, Ultraviolet Spectra, White Dwarf Stars, Absorption Spectra, Abundance, Brightness Distribution, Emission Spectra, Interstellar Extinction

Scientific paper

The remarkable central star (0950 + 139), a very hot DA/DAO white dwarf, of the planetary nebula EGB 6 is described. Follow-up observations relevant to the analyses of both the nebula and the stellar photosphere are presented. Three kinds of scenarios are discussed to account for the existence of this peculiar nebula, but none appears very promising. The first consideration is that the nebula was ejected from the white dwarf as a discret event. This hypothesis is heavily constrained by the nebular size, density, and expansion rate; by the low luminosity and radius of the star; and by the absence of evidence for variation in density-sensitive forbidden lines from 1978 to 1987. No plausible mechanism can cause the observed amount of mass to be lost directly from a white dwarf in a steady or sporadic wind, at outflow velocities orders of magnitude below the escape velocity. Final consideration is given to the possibility that the gas is lost from a close companion star, but there is no evidence that this is a close binary system.

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