A New Hot DA White Dwarf in a Region of Exeptionally Low HI Density

Details A New Hot DA White Dwarf in a Region of Exeptionally Low HI Density A New Hot DA White Dwarf in a Region of Exeptionally Low HI Density

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.267..647b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 267, NO. 3/APR1, P. 647, 1994

Astronomy and Astrophysics

Astronomy

17

Stars: Atmospheres - Stars: Individual: Re 0457-281 - White Dwarfs - Ism: Abundances - Ultraviolet: Stars

Scientific paper

We report the discovery of the hot DA white dwarf RE 0457-281 which has the lowest line-of-sight neutral hydrogen column density yet measured. The star was found independently by the ROSAT EUV, Montreal-Cambridge-Tololo and Edinburgh-Cape surveys. With an effective temperature of 60700 K and very soft EUV spectrum, this white dwarf resembles the well-studied hot DA white dwarf G 191-B2B. A follow-up observation made using the Voyager 2 UV spectrometer reveals a strong continuum shortward of the 912-Å Lyman limit from which we deduce that the neutral hydrogen column density is 1.3 × 1017 atom cm-2.

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