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dc.contributor.authorCastanheira, Bárbara Garciapt_BR
dc.contributor.authorKepler, Souza Oliveirapt_BR
dc.contributor.authorHandler, Geraldpt_BR
dc.contributor.authorKoester, Detlevpt_BR
dc.date.accessioned2014-07-31T02:05:08Zpt_BR
dc.date.issued2006pt_BR
dc.identifier.issn0004-6361pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/98974pt_BR
dc.description.abstractWe studied the class of DB white dwarf stars, using re-calibrated UV spectra for thirty four DBs obtained with the IUE satellite. By comparing the observed energy distributions with model atmospheres, we simultaneously determine spectroscopic distances (d), effective temperature (Teff), and surface gravities (log g). Using parallax measurements and previous determinations of Teff and log g from optical spectra, we can study whether the atmospheres of eleven DB stars are consistent with pure He or have a small amount of H contamination. We also report on our observations of seventeen stars with Teff close to the DB instability strip through time series photometry and found them to be non variable within our detection limits.en
dc.format.mimetypeapplication/pdf
dc.language.isoengpt_BR
dc.relation.ispartofAstronomy and astrophysics. Vol. 450, no. 1 (Apr. IV 2006), p. 331-337pt_BR
dc.rightsOpen Accessen
dc.subjectStars: white dwarfsen
dc.subjectAstronomiapt_BR
dc.subjectStars: variables: generalen
dc.subjectStars: oscillationsen
dc.subjectUltraviolet: starsen
dc.titleAnalysis of IUE spectra of helium-rich white dwarf starspt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000558558pt_BR
dc.type.originEstrangeiropt_BR


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