Ground-based observation of ZZ Ceti stars and the discovery of four new variables
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/205543 |
Resumo: | We perform ground-based photometric observations of 22 DA white dwarf stars, 10 already known ZZ Cetis and 12 candidates with atmospheric parameters inside the classical instability strip. We report on the discovery of four new variable DA white dwarf stars. Two objects are near the middle of the instability strip, SDSS J082804.63+094956.6 and SDSS J094929.09+101918.8, and two red edge pulsators, GD 195 and L495−82. In addition, we classified four objects as possible variables, since evidence of variability was detected in the light curve, but the signal-to-noise ratio was not sufficient to establish a definite detection. Follow-up observations were performed for 10 known ZZ Ceti stars to verify period stability and search for new periodicities. For each confirmed variable, we perform a detailed asteroseismological fit and compare the structural parameters obtained from the best-fitting models with those obtained from spectroscopy and photometry from Gaia. Finally we present a study of the asteroseismological properties of a sample of 91 ZZ Ceti stars. |
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Romero, Alejandra DanielaAmaral, Larissa AntunesKlippel, Theylor SchumacherSanmartim, DavidFraga, LucianoOurique, GustavoPelisoli, Ingrid DomingosRamos, Gabriel LaufferKepler, Souza OliveiraKoester, Detlev2020-02-06T04:18:05Z20190035-8711http://hdl.handle.net/10183/205543001107924We perform ground-based photometric observations of 22 DA white dwarf stars, 10 already known ZZ Cetis and 12 candidates with atmospheric parameters inside the classical instability strip. We report on the discovery of four new variable DA white dwarf stars. Two objects are near the middle of the instability strip, SDSS J082804.63+094956.6 and SDSS J094929.09+101918.8, and two red edge pulsators, GD 195 and L495−82. In addition, we classified four objects as possible variables, since evidence of variability was detected in the light curve, but the signal-to-noise ratio was not sufficient to establish a definite detection. Follow-up observations were performed for 10 known ZZ Ceti stars to verify period stability and search for new periodicities. For each confirmed variable, we perform a detailed asteroseismological fit and compare the structural parameters obtained from the best-fitting models with those obtained from spectroscopy and photometry from Gaia. Finally we present a study of the asteroseismological properties of a sample of 91 ZZ Ceti stars.application/pdfengMonthly notices of the royal astronomical society. Oxford. Vol. 490, no. 2 (Dec. 2019), p. 1803–1820Anãs brancasEvolucao estelarEstrelas ZZ CetiStars: evolutionStars: variables: generalWhite dwarfGround-based observation of ZZ Ceti stars and the discovery of four new variablesEstrangeiroinfo: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:UFRGSTEXT001107924.pdf.txt001107924.pdf.txtExtracted Texttext/plain83328http://www.lume.ufrgs.br/bitstream/10183/205543/2/001107924.pdf.txtdbe7efce677bac6087310908a47aaf30MD52ORIGINAL001107924.pdfTexto completo (inglês)application/pdf2139817http://www.lume.ufrgs.br/bitstream/10183/205543/1/001107924.pdf5e4b26836b1d9aa27ea0743bebc86a23MD5110183/2055432023-05-14 03:24:59.48121oai:www.lume.ufrgs.br:10183/205543Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-05-14T06:24:59Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Ground-based observation of ZZ Ceti stars and the discovery of four new variables |
title |
Ground-based observation of ZZ Ceti stars and the discovery of four new variables |
spellingShingle |
Ground-based observation of ZZ Ceti stars and the discovery of four new variables Romero, Alejandra Daniela Anãs brancas Evolucao estelar Estrelas ZZ Ceti Stars: evolution Stars: variables: general White dwarf |
title_short |
Ground-based observation of ZZ Ceti stars and the discovery of four new variables |
title_full |
Ground-based observation of ZZ Ceti stars and the discovery of four new variables |
title_fullStr |
Ground-based observation of ZZ Ceti stars and the discovery of four new variables |
title_full_unstemmed |
Ground-based observation of ZZ Ceti stars and the discovery of four new variables |
title_sort |
Ground-based observation of ZZ Ceti stars and the discovery of four new variables |
author |
Romero, Alejandra Daniela |
author_facet |
Romero, Alejandra Daniela Amaral, Larissa Antunes Klippel, Theylor Schumacher Sanmartim, David Fraga, Luciano Ourique, Gustavo Pelisoli, Ingrid Domingos Ramos, Gabriel Lauffer Kepler, Souza Oliveira Koester, Detlev |
author_role |
author |
author2 |
Amaral, Larissa Antunes Klippel, Theylor Schumacher Sanmartim, David Fraga, Luciano Ourique, Gustavo Pelisoli, Ingrid Domingos Ramos, Gabriel Lauffer Kepler, Souza Oliveira Koester, Detlev |
author2_role |
author author author author author author author author author |
dc.contributor.author.fl_str_mv |
Romero, Alejandra Daniela Amaral, Larissa Antunes Klippel, Theylor Schumacher Sanmartim, David Fraga, Luciano Ourique, Gustavo Pelisoli, Ingrid Domingos Ramos, Gabriel Lauffer Kepler, Souza Oliveira Koester, Detlev |
dc.subject.por.fl_str_mv |
Anãs brancas Evolucao estelar Estrelas ZZ Ceti |
topic |
Anãs brancas Evolucao estelar Estrelas ZZ Ceti Stars: evolution Stars: variables: general White dwarf |
dc.subject.eng.fl_str_mv |
Stars: evolution Stars: variables: general White dwarf |
description |
We perform ground-based photometric observations of 22 DA white dwarf stars, 10 already known ZZ Cetis and 12 candidates with atmospheric parameters inside the classical instability strip. We report on the discovery of four new variable DA white dwarf stars. Two objects are near the middle of the instability strip, SDSS J082804.63+094956.6 and SDSS J094929.09+101918.8, and two red edge pulsators, GD 195 and L495−82. In addition, we classified four objects as possible variables, since evidence of variability was detected in the light curve, but the signal-to-noise ratio was not sufficient to establish a definite detection. Follow-up observations were performed for 10 known ZZ Ceti stars to verify period stability and search for new periodicities. For each confirmed variable, we perform a detailed asteroseismological fit and compare the structural parameters obtained from the best-fitting models with those obtained from spectroscopy and photometry from Gaia. Finally we present a study of the asteroseismological properties of a sample of 91 ZZ Ceti stars. |
publishDate |
2019 |
dc.date.issued.fl_str_mv |
2019 |
dc.date.accessioned.fl_str_mv |
2020-02-06T04:18:05Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
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info:eu-repo/semantics/publishedVersion |
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article |
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publishedVersion |
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http://hdl.handle.net/10183/205543 |
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0035-8711 |
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001107924 |
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0035-8711 001107924 |
url |
http://hdl.handle.net/10183/205543 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Monthly notices of the royal astronomical society. Oxford. Vol. 490, no. 2 (Dec. 2019), p. 1803–1820 |
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info:eu-repo/semantics/openAccess |
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openAccess |
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