Analysis of IUE spectra of helium-rich white dwarf stars

Detalhes bibliográficos
Autor(a) principal: Castanheira, Bárbara Garcia
Data de Publicação: 2006
Outros Autores: Kepler, Souza Oliveira, Handler, Gerald, Koester, Detlev
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFRGS
Texto Completo: http://hdl.handle.net/10183/98974
Resumo: We 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.
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spelling Castanheira, Bárbara GarciaKepler, Souza OliveiraHandler, GeraldKoester, Detlev2014-07-31T02:05:08Z20060004-6361http://hdl.handle.net/10183/98974000558558We 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.application/pdfengAstronomy and astrophysics. Vol. 450, no. 1 (Apr. IV 2006), p. 331-337AstronomiaStars: white dwarfsStars: variables: generalStars: oscillationsUltraviolet: starsAnalysis of IUE spectra of helium-rich white dwarf starsEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000558558.pdf000558558.pdfTexto completo (inglês)application/pdf296996http://www.lume.ufrgs.br/bitstream/10183/98974/1/000558558.pdf5007134665023870d6147dbfab34a21aMD51TEXT000558558.pdf.txt000558558.pdf.txtExtracted Texttext/plain29562http://www.lume.ufrgs.br/bitstream/10183/98974/2/000558558.pdf.txtf4b20c40d908ef755315e2e14cab4df8MD52THUMBNAIL000558558.pdf.jpg000558558.pdf.jpgGenerated Thumbnailimage/jpeg2185http://www.lume.ufrgs.br/bitstream/10183/98974/3/000558558.pdf.jpg2be06a75a84fabcd16f155a80b98774cMD5310183/989742018-10-22 08:18:33.793oai:www.lume.ufrgs.br:10183/98974Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2018-10-22T11:18:33Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv Analysis of IUE spectra of helium-rich white dwarf stars
title Analysis of IUE spectra of helium-rich white dwarf stars
spellingShingle Analysis of IUE spectra of helium-rich white dwarf stars
Castanheira, Bárbara Garcia
Astronomia
Stars: white dwarfs
Stars: variables: general
Stars: oscillations
Ultraviolet: stars
title_short Analysis of IUE spectra of helium-rich white dwarf stars
title_full Analysis of IUE spectra of helium-rich white dwarf stars
title_fullStr Analysis of IUE spectra of helium-rich white dwarf stars
title_full_unstemmed Analysis of IUE spectra of helium-rich white dwarf stars
title_sort Analysis of IUE spectra of helium-rich white dwarf stars
author Castanheira, Bárbara Garcia
author_facet Castanheira, Bárbara Garcia
Kepler, Souza Oliveira
Handler, Gerald
Koester, Detlev
author_role author
author2 Kepler, Souza Oliveira
Handler, Gerald
Koester, Detlev
author2_role author
author
author
dc.contributor.author.fl_str_mv Castanheira, Bárbara Garcia
Kepler, Souza Oliveira
Handler, Gerald
Koester, Detlev
dc.subject.por.fl_str_mv Astronomia
topic Astronomia
Stars: white dwarfs
Stars: variables: general
Stars: oscillations
Ultraviolet: stars
dc.subject.eng.fl_str_mv Stars: white dwarfs
Stars: variables: general
Stars: oscillations
Ultraviolet: stars
description We 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.
publishDate 2006
dc.date.issued.fl_str_mv 2006
dc.date.accessioned.fl_str_mv 2014-07-31T02:05:08Z
dc.type.driver.fl_str_mv Estrangeiro
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status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10183/98974
dc.identifier.issn.pt_BR.fl_str_mv 0004-6361
dc.identifier.nrb.pt_BR.fl_str_mv 000558558
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dc.language.iso.fl_str_mv eng
language eng
dc.relation.ispartof.pt_BR.fl_str_mv Astronomy and astrophysics. Vol. 450, no. 1 (Apr. IV 2006), p. 331-337
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eu_rights_str_mv openAccess
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