Nature of blackbody stars

Autores
Serenelli, Aldo; Rohrmann, Rene Daniel; Fukugita, Masataka
Año de publicación
2019
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
A selection of 17 stars in the Sloan Digital Sky Survey, previously identified as DC-class white dwarfs (WDs), has been reported to show spectra very close to blackbody radiation in the wavelength range from ultraviolet to infrared. Because of the absence of lines and other details in their spectra, the surface gravity of these objects has previously been poorly constrained, and their effective temperatures have been determined by fits to the continuum spectrum using pure helium atmosphere models. We computed model atmospheres with pure helium and H/He mixtures and used Gaia DR2 parallaxes that are available for 16 of the 17 selected stars to analyze their physical properties.We find that the atmospheres of the selected stars are very probably contaminated with a trace amount of hydrogen of -6 ≤ log (NH/NHe) ≤ -5.4. For the 16 stars with Gaia parallaxes, we calculate a mean stellar mass 0.606 ± 0.076 M⊙, which represents typical mass values and surface gravities (7.8 < log g < 8.3) for WDs.
Fil: Serenelli, Aldo. Universitat Autònoma de Barcelona; España. Consejo Superior de Investigaciones Científicas; España
Fil: Rohrmann, Rene Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio. Universidad Nacional de San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio; Argentina
Fil: Fukugita, Masataka. Institute For Advanced Studies; Estados Unidos
Materia
OPACITY
STARS: ATMOSPHERES
STARS: EVOLUTION
WHITE DWARFS
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/124772
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Nature of blackbody starsSerenelli, AldoRohrmann, Rene DanielFukugita, MasatakaOPACITYSTARS: ATMOSPHERESSTARS: EVOLUTIONWHITE DWARFShttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1A selection of 17 stars in the Sloan Digital Sky Survey, previously identified as DC-class white dwarfs (WDs), has been reported to show spectra very close to blackbody radiation in the wavelength range from ultraviolet to infrared. Because of the absence of lines and other details in their spectra, the surface gravity of these objects has previously been poorly constrained, and their effective temperatures have been determined by fits to the continuum spectrum using pure helium atmosphere models. We computed model atmospheres with pure helium and H/He mixtures and used Gaia DR2 parallaxes that are available for 16 of the 17 selected stars to analyze their physical properties.We find that the atmospheres of the selected stars are very probably contaminated with a trace amount of hydrogen of -6 ≤ log (NH/NHe) ≤ -5.4. For the 16 stars with Gaia parallaxes, we calculate a mean stellar mass 0.606 ± 0.076 M⊙, which represents typical mass values and surface gravities (7.8 < log g < 8.3) for WDs.Fil: Serenelli, Aldo. Universitat Autònoma de Barcelona; España. Consejo Superior de Investigaciones Científicas; EspañaFil: Rohrmann, Rene Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio. Universidad Nacional de San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio; ArgentinaFil: Fukugita, Masataka. Institute For Advanced Studies; Estados UnidosEDP Sciences2019-03info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/124772Serenelli, Aldo; Rohrmann, Rene Daniel; Fukugita, Masataka; Nature of blackbody stars; EDP Sciences; Astronomy and Astrophysics; 623; 3-2019; 1-70004-6361CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201834032info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2019/03/aa34032-18/aa34032-18.htmlinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T11:10:07Zoai:ri.conicet.gov.ar:11336/124772instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-10-22 11:10:08.039CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Nature of blackbody stars
title Nature of blackbody stars
spellingShingle Nature of blackbody stars
Serenelli, Aldo
OPACITY
STARS: ATMOSPHERES
STARS: EVOLUTION
WHITE DWARFS
title_short Nature of blackbody stars
title_full Nature of blackbody stars
title_fullStr Nature of blackbody stars
title_full_unstemmed Nature of blackbody stars
title_sort Nature of blackbody stars
dc.creator.none.fl_str_mv Serenelli, Aldo
Rohrmann, Rene Daniel
Fukugita, Masataka
author Serenelli, Aldo
author_facet Serenelli, Aldo
Rohrmann, Rene Daniel
Fukugita, Masataka
author_role author
author2 Rohrmann, Rene Daniel
Fukugita, Masataka
author2_role author
author
dc.subject.none.fl_str_mv OPACITY
STARS: ATMOSPHERES
STARS: EVOLUTION
WHITE DWARFS
topic OPACITY
STARS: ATMOSPHERES
STARS: EVOLUTION
WHITE DWARFS
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv A selection of 17 stars in the Sloan Digital Sky Survey, previously identified as DC-class white dwarfs (WDs), has been reported to show spectra very close to blackbody radiation in the wavelength range from ultraviolet to infrared. Because of the absence of lines and other details in their spectra, the surface gravity of these objects has previously been poorly constrained, and their effective temperatures have been determined by fits to the continuum spectrum using pure helium atmosphere models. We computed model atmospheres with pure helium and H/He mixtures and used Gaia DR2 parallaxes that are available for 16 of the 17 selected stars to analyze their physical properties.We find that the atmospheres of the selected stars are very probably contaminated with a trace amount of hydrogen of -6 ≤ log (NH/NHe) ≤ -5.4. For the 16 stars with Gaia parallaxes, we calculate a mean stellar mass 0.606 ± 0.076 M⊙, which represents typical mass values and surface gravities (7.8 < log g < 8.3) for WDs.
Fil: Serenelli, Aldo. Universitat Autònoma de Barcelona; España. Consejo Superior de Investigaciones Científicas; España
Fil: Rohrmann, Rene Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio. Universidad Nacional de San Juan. Instituto de Ciencias Astronómicas, de la Tierra y del Espacio; Argentina
Fil: Fukugita, Masataka. Institute For Advanced Studies; Estados Unidos
description A selection of 17 stars in the Sloan Digital Sky Survey, previously identified as DC-class white dwarfs (WDs), has been reported to show spectra very close to blackbody radiation in the wavelength range from ultraviolet to infrared. Because of the absence of lines and other details in their spectra, the surface gravity of these objects has previously been poorly constrained, and their effective temperatures have been determined by fits to the continuum spectrum using pure helium atmosphere models. We computed model atmospheres with pure helium and H/He mixtures and used Gaia DR2 parallaxes that are available for 16 of the 17 selected stars to analyze their physical properties.We find that the atmospheres of the selected stars are very probably contaminated with a trace amount of hydrogen of -6 ≤ log (NH/NHe) ≤ -5.4. For the 16 stars with Gaia parallaxes, we calculate a mean stellar mass 0.606 ± 0.076 M⊙, which represents typical mass values and surface gravities (7.8 < log g < 8.3) for WDs.
publishDate 2019
dc.date.none.fl_str_mv 2019-03
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/124772
Serenelli, Aldo; Rohrmann, Rene Daniel; Fukugita, Masataka; Nature of blackbody stars; EDP Sciences; Astronomy and Astrophysics; 623; 3-2019; 1-7
0004-6361
CONICET Digital
CONICET
url http://hdl.handle.net/11336/124772
identifier_str_mv Serenelli, Aldo; Rohrmann, Rene Daniel; Fukugita, Masataka; Nature of blackbody stars; EDP Sciences; Astronomy and Astrophysics; 623; 3-2019; 1-7
0004-6361
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201834032
info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2019/03/aa34032-18/aa34032-18.html
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
_version_ 1846781458905038848
score 12.982451

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