Analysis of IUE spectra of helium-rich white dwarf stars
Autor(a) principal: | |
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Data de Publicação: | 2006 |
Outros Autores: | , , |
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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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 info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
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 |
identifier_str_mv |
0004-6361 000558558 |
url |
http://hdl.handle.net/10183/98974 |
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 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
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Repositório Institucional da UFRGS |
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Repositório Institucional da UFRGS |
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