Two new hot white dwarfs in a region of exceptionally low HI density

Details Two new hot white dwarfs in a region of exceptionally low HI density Two new hot white dwarfs in a region of exceptionally low HI density

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13r.281b&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 13, no. 12, p. (12)281-(12)285

Astronomy and Astrophysics

Astronomy

3

Extreme Ultraviolet Radiation, Flux Density, Hydrogen, Particle Density (Concentration), Ultraviolet Astronomy, Ultraviolet Spectra, White Dwarf Stars, Cameras, Interstellar Matter, Rosat Mission, Schmidt Telescopes, Sky Surveys (Astronomy), Ultraviolet Spectrometers, Voyager 2 Spacecraft

Scientific paper

We report the discovery of two hot white dwarfs which have the lowest line-of-sight neutral hydrogen column densities yet measured. The stars were found independently by the ROSAT EUV, Montreal-Cambridge-Tololo, and Edinburgh-Cape surveys. Follow-up observations made using the Voyager 2 ultraviolet spectrometer reveal strong continua shortward of the 912A Lyman limit from which we deduce that the neutral hydrogen column densities are 1.3 x 1017 and 2.0 x 1017 atoms/sq cm.

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