A new hot DA white dwarf in a region of exceptionally low HI density

Barstow, Martin A.; Wesemael, F.; Holberg, J.B.; Buckley, David A.H.; Stobie, Robert S.; Mittaz, J.P.D.; Fontaine, Gilles; Rosen, Simon R.; Demers, Serge; Lamontagne, R.; Irwin, Michael John; Bergeron, Pierre; Kepler, Souza Oliveira; Vennes, S.

dc.contributor.author	Barstow, Martin A.	pt_BR
dc.contributor.author	Wesemael, F.	pt_BR
dc.contributor.author	Holberg, J.B.	pt_BR
dc.contributor.author	Buckley, David A.H.	pt_BR
dc.contributor.author	Stobie, Robert S.	pt_BR
dc.contributor.author	Mittaz, J.P.D.	pt_BR
dc.contributor.author	Fontaine, Gilles	pt_BR
dc.contributor.author	Rosen, Simon R.	pt_BR
dc.contributor.author	Demers, Serge	pt_BR
dc.contributor.author	Lamontagne, R.	pt_BR
dc.contributor.author	Irwin, Michael John	pt_BR
dc.contributor.author	Bergeron, Pierre	pt_BR
dc.contributor.author	Kepler, Souza Oliveira	pt_BR
dc.contributor.author	Vennes, S.	pt_BR
dc.date.accessioned	2014-03-21T01:48:49Z	pt_BR
dc.date.issued	1994	pt_BR
dc.identifier.issn	0035-8711	pt_BR
dc.identifier.uri	http://hdl.handle.net/10183/88728	pt_BR
dc.description.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 60 700 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 x 1O 17 atom cm-².	en
dc.format.mimetype	application/pdf	pt_BR
dc.language.iso	eng	pt_BR
dc.relation.ispartof	Monthly Notices of the Royal Astronomical Society. London. Vol. 267, no. 3 (Apr. 1994), p. 647-652	pt_BR
dc.rights	Open Access	en
dc.subject	Astrofisica estelar	pt_BR
dc.subject	Stars: atmospheres	en
dc.subject	Stars: individual: RE 0457- 281	en
dc.subject	Astrofísica	pt_BR
dc.subject	Abundancia	pt_BR
dc.subject	White dwarfs	en
dc.subject	Anãs brancas	pt_BR
dc.subject	ISM: abundances	en
dc.subject	Ultraviolet: stars	en
dc.title	A new hot DA white dwarf in a region of exceptionally low HI density	pt_BR
dc.type	Artigo de periódico	pt_BR
dc.identifier.nrb	000220166	pt_BR
dc.type.origin	Estrangeiro	pt_BR

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