A new hot DA white dwarf in a region of exeptionally low H I density
Open Access
- 1 April 1994
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 267 (3) , 647-652
- https://doi.org/10.1093/mnras/267.3.647
Abstract
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.Keywords
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