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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/124772
Ver los metadatos del registro completo
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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 Técnicas2025-09-29T09:41:32Zoai: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:34982025-09-29 09:41:33.253CONICET 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 |
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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 |
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1844613311953371136 |
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13.070432 |