Abstract 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 912Å Lyman limit from which we deduce that the neutral hydrogen column densities are 1.3 × 1017 and 2.0 × 1017 atoms cm −2.
Two new hot white dwarfs in a region of exceptionally low hi density
Advances in Space Research ; 13 , 12 ; 281-285
1993-01-01
5 pages
Article (Journal)
Electronic Resource
English
Two New Hot White Dwarfs in a Region of Exceptionally Low HI Density
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