Detection of an extremely faint emission nebula surrounding the hot white dwarf PG 0108+101

Details Detection of an extremely faint emission nebula surrounding the hot white dwarf PG 0108+101 Detection of an extremely faint emission nebula surrounding the hot white dwarf PG 0108+101

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...315..234r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 315, April 1, 1987, p. 234-238.

Astronomy and Astrophysics

Astronomy

27

Faint Objects, Hot Stars, Planetary Nebulae, Subdwarf Stars, White Dwarf Stars, Emission Spectra, Energy Distribution, H Alpha Line, H Ii Regions, O Stars, Sky Surveys (Astronomy), Stellar Spectra, Stellar Temperature

Scientific paper

A high-sensitivity search was made for H-alpha emission enhancements around nine very hot low-mass stars that have no associated emission nebulosity visible on the Palomar Sky Surveys prints (i.e., emission measures less than about 60 cm exp -6 pc). The observations reveal that one of the stars, the 15th mag DO white dwarf PG 0108+101, is surrounded by an H II region about 1.6 deg in diameter with an emission measure of 1 cm exp -6 pc, a radius of 2.5-5 pc, and an rms electron density of 0.3-0.5/cu cm. The H-alpha flux provides a Zanstra temperature of 71,000-86,000 K for PG 0108+101, which is consistent with the effective temperature of the star deduced by Wesemael et al. (1985) from its UV energy distribution and spectral features. It is not clear whether this emission region is an extremely evolved planetary nebula or ionized ambient interstellar gas. No H-alpha intensity enhancements were found around the other stars, indicating low (less than about 0.2-0.8/cu cm) densities for the surrounding gas.

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