Catalog of magnetic white dwarfs with hydrogen dominated atmospheres
Autor(a) principal: | |
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Data de Publicação: | 2023 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/257903 |
Resumo: | White dwarfs are excellent research laboratories as they reach temperatures, pressures, and magnetic fields that are unattainable on Earth. To better understand how these three physical parameters interact with each other and with other stellar features, we determined the magnetic field strength for a total of 804 hydrogen-rich white dwarfs (WDs) of which 287 are not in the literature. We fitted the spectra observed with the Sloan Digital Sky Survey using atmospheric models that consider the Zeeman effect due to the magnetic field at each point in the stellar disk. Comparing magnetic and nonmagnetic WDs, the literature already shows that the magnetic ones have on average higher mass than the nonmagnetic. In addition to that, magnetic fields are more common in cooler WDs than in hotter WDs. In consonance, we found that those with higher magnetic field strengths tend to have higher masses, and lower temperatures, for which models indicate the crystallization process has already started. This reinforces the hypothesis that the field is being generated and/or amplified in the cooling process of the white dwarf. Our sample constitutes the largest number of white dwarfs with determined magnetic fields to date. |
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Amorim, Larissa LucianoKepler, Souza OliveiraKulebi, BaybarsJordan, StefanRomero, Alejandra Daniela2023-05-10T03:27:58Z20230004-637Xhttp://hdl.handle.net/10183/257903001165337White dwarfs are excellent research laboratories as they reach temperatures, pressures, and magnetic fields that are unattainable on Earth. To better understand how these three physical parameters interact with each other and with other stellar features, we determined the magnetic field strength for a total of 804 hydrogen-rich white dwarfs (WDs) of which 287 are not in the literature. We fitted the spectra observed with the Sloan Digital Sky Survey using atmospheric models that consider the Zeeman effect due to the magnetic field at each point in the stellar disk. Comparing magnetic and nonmagnetic WDs, the literature already shows that the magnetic ones have on average higher mass than the nonmagnetic. In addition to that, magnetic fields are more common in cooler WDs than in hotter WDs. In consonance, we found that those with higher magnetic field strengths tend to have higher masses, and lower temperatures, for which models indicate the crystallization process has already started. This reinforces the hypothesis that the field is being generated and/or amplified in the cooling process of the white dwarf. Our sample constitutes the largest number of white dwarfs with determined magnetic fields to date.application/pdfengThe astrophysical journal. Bristol. Vol. 944, no. 1 (Feb. 2023), 56, 12 p.Anãs brancasCampos magnéticosCatalogos astronomicosWhite dwarf starsDA starsCatalog of magnetic white dwarfs with hydrogen dominated atmospheresEstrangeiroinfo: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:UFRGSTEXT001165337.pdf.txt001165337.pdf.txtExtracted Texttext/plain42238http://www.lume.ufrgs.br/bitstream/10183/257903/2/001165337.pdf.txte53b52ba1da66c2b30594b8c9c22b06cMD52ORIGINAL001165337.pdfTexto completo (inglês)application/pdf6643315http://www.lume.ufrgs.br/bitstream/10183/257903/1/001165337.pdf35c6d0c94ad6a625f9cd238e55ec5508MD5110183/2579032023-05-14 03:24:49.959047oai:www.lume.ufrgs.br:10183/257903Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-05-14T06:24:49Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Catalog of magnetic white dwarfs with hydrogen dominated atmospheres |
title |
Catalog of magnetic white dwarfs with hydrogen dominated atmospheres |
spellingShingle |
Catalog of magnetic white dwarfs with hydrogen dominated atmospheres Amorim, Larissa Luciano Anãs brancas Campos magnéticos Catalogos astronomicos White dwarf stars DA stars |
title_short |
Catalog of magnetic white dwarfs with hydrogen dominated atmospheres |
title_full |
Catalog of magnetic white dwarfs with hydrogen dominated atmospheres |
title_fullStr |
Catalog of magnetic white dwarfs with hydrogen dominated atmospheres |
title_full_unstemmed |
Catalog of magnetic white dwarfs with hydrogen dominated atmospheres |
title_sort |
Catalog of magnetic white dwarfs with hydrogen dominated atmospheres |
author |
Amorim, Larissa Luciano |
author_facet |
Amorim, Larissa Luciano Kepler, Souza Oliveira Kulebi, Baybars Jordan, Stefan Romero, Alejandra Daniela |
author_role |
author |
author2 |
Kepler, Souza Oliveira Kulebi, Baybars Jordan, Stefan Romero, Alejandra Daniela |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Amorim, Larissa Luciano Kepler, Souza Oliveira Kulebi, Baybars Jordan, Stefan Romero, Alejandra Daniela |
dc.subject.por.fl_str_mv |
Anãs brancas Campos magnéticos Catalogos astronomicos |
topic |
Anãs brancas Campos magnéticos Catalogos astronomicos White dwarf stars DA stars |
dc.subject.eng.fl_str_mv |
White dwarf stars DA stars |
description |
White dwarfs are excellent research laboratories as they reach temperatures, pressures, and magnetic fields that are unattainable on Earth. To better understand how these three physical parameters interact with each other and with other stellar features, we determined the magnetic field strength for a total of 804 hydrogen-rich white dwarfs (WDs) of which 287 are not in the literature. We fitted the spectra observed with the Sloan Digital Sky Survey using atmospheric models that consider the Zeeman effect due to the magnetic field at each point in the stellar disk. Comparing magnetic and nonmagnetic WDs, the literature already shows that the magnetic ones have on average higher mass than the nonmagnetic. In addition to that, magnetic fields are more common in cooler WDs than in hotter WDs. In consonance, we found that those with higher magnetic field strengths tend to have higher masses, and lower temperatures, for which models indicate the crystallization process has already started. This reinforces the hypothesis that the field is being generated and/or amplified in the cooling process of the white dwarf. Our sample constitutes the largest number of white dwarfs with determined magnetic fields to date. |
publishDate |
2023 |
dc.date.accessioned.fl_str_mv |
2023-05-10T03:27:58Z |
dc.date.issued.fl_str_mv |
2023 |
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/10183/257903 |
dc.identifier.issn.pt_BR.fl_str_mv |
0004-637X |
dc.identifier.nrb.pt_BR.fl_str_mv |
001165337 |
identifier_str_mv |
0004-637X 001165337 |
url |
http://hdl.handle.net/10183/257903 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
The astrophysical journal. Bristol. Vol. 944, no. 1 (Feb. 2023), 56, 12 p. |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UFRGS instname:Universidade Federal do Rio Grande do Sul (UFRGS) instacron:UFRGS |
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UFRGS |
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Repositório Institucional da UFRGS |
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Repositório Institucional da UFRGS |
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