Chemical fingerprints of He-sdO stars

Autores
Schindewolf, Markus; Németh, Peter; Heber, Ulrich; Battich, Tiara; Miller Bertolami, Marcelo Miguel; Latour, Marilyn
Año de publicación
2018
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The chemical composition of helium-rich hot subluminous O stars plays an important role to understand and model their formation history. We present a spectroscopic analysis of four He-sdO stars,CD-31∘ 4800, [CW83] 0904- 02, LSS 1274 and LS IV +10∘ 9. The analysis is based on archival optical and UV high-resolution spectra. We used Tlusty200/Synspec48 to compute line blanketed non-LTE model atmospheres and their corresponding synthetic spectra and derive the atmospheric parameters as well as the abundances of the most prominent elements. All stars have helium-dominated atmospheres with hardly any hydrogen and temperatures between 42000 K and 47000 K while their surface gravity spans between log g = 5.4 and 5.7. CD-31∘ 4800 shows an enrichment of nitrogen and the characteristic pattern of hydrogen burning via the CNO-cycle, while the rest of the elements have about the solar abundance. This points to the slow merger of two helium white dwarfs as the most likely origin for this system. The other three stars are enriched in carbon, nitrogen and neon while their intermediate mass element’s abundance scatters around the solar value. They were possibly formed in the deep mixing late hot flasher scenario.
Facultad de Ciencias Astronómicas y Geofísicas
Materia
Astronomía
subdwarfs
abundances
He-sdO
hot flasher
slow merger
atmospheric parameters
stellar atmospheres
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-nd/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/78622

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network_name_str SEDICI (UNLP)
spelling Chemical fingerprints of He-sdO starsSchindewolf, MarkusNémeth, PeterHeber, UlrichBattich, TiaraMiller Bertolami, Marcelo MiguelLatour, MarilynAstronomíasubdwarfsabundancesHe-sdOhot flasherslow mergeratmospheric parametersstellar atmospheresThe chemical composition of helium-rich hot subluminous O stars plays an important role to understand and model their formation history. We present a spectroscopic analysis of four He-sdO stars,CD-31∘ 4800, [CW83] 0904- 02, LSS 1274 and LS IV +10∘ 9. The analysis is based on archival optical and UV high-resolution spectra. We used Tlusty200/Synspec48 to compute line blanketed non-LTE model atmospheres and their corresponding synthetic spectra and derive the atmospheric parameters as well as the abundances of the most prominent elements. All stars have helium-dominated atmospheres with hardly any hydrogen and temperatures between 42000 K and 47000 K while their surface gravity spans between log g = 5.4 and 5.7. CD-31∘ 4800 shows an enrichment of nitrogen and the characteristic pattern of hydrogen burning via the CNO-cycle, while the rest of the elements have about the solar abundance. This points to the slow merger of two helium white dwarfs as the most likely origin for this system. The other three stars are enriched in carbon, nitrogen and neon while their intermediate mass element’s abundance scatters around the solar value. They were possibly formed in the deep mixing late hot flasher scenario.Facultad de Ciencias Astronómicas y Geofísicas2018-02info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf27-34http://sedici.unlp.edu.ar/handle/10915/78622enginfo:eu-repo/semantics/altIdentifier/issn/2543-6376info:eu-repo/semantics/altIdentifier/doi/10.1515/astro-2018-0010info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-nd/4.0/Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:14:13Zoai:sedici.unlp.edu.ar:10915/78622Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:14:13.793SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Chemical fingerprints of He-sdO stars
title Chemical fingerprints of He-sdO stars
spellingShingle Chemical fingerprints of He-sdO stars
Schindewolf, Markus
Astronomía
subdwarfs
abundances
He-sdO
hot flasher
slow merger
atmospheric parameters
stellar atmospheres
title_short Chemical fingerprints of He-sdO stars
title_full Chemical fingerprints of He-sdO stars
title_fullStr Chemical fingerprints of He-sdO stars
title_full_unstemmed Chemical fingerprints of He-sdO stars
title_sort Chemical fingerprints of He-sdO stars
dc.creator.none.fl_str_mv Schindewolf, Markus
Németh, Peter
Heber, Ulrich
Battich, Tiara
Miller Bertolami, Marcelo Miguel
Latour, Marilyn
author Schindewolf, Markus
author_facet Schindewolf, Markus
Németh, Peter
Heber, Ulrich
Battich, Tiara
Miller Bertolami, Marcelo Miguel
Latour, Marilyn
author_role author
author2 Németh, Peter
Heber, Ulrich
Battich, Tiara
Miller Bertolami, Marcelo Miguel
Latour, Marilyn
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Astronomía
subdwarfs
abundances
He-sdO
hot flasher
slow merger
atmospheric parameters
stellar atmospheres
topic Astronomía
subdwarfs
abundances
He-sdO
hot flasher
slow merger
atmospheric parameters
stellar atmospheres
dc.description.none.fl_txt_mv The chemical composition of helium-rich hot subluminous O stars plays an important role to understand and model their formation history. We present a spectroscopic analysis of four He-sdO stars,CD-31∘ 4800, [CW83] 0904- 02, LSS 1274 and LS IV +10∘ 9. The analysis is based on archival optical and UV high-resolution spectra. We used Tlusty200/Synspec48 to compute line blanketed non-LTE model atmospheres and their corresponding synthetic spectra and derive the atmospheric parameters as well as the abundances of the most prominent elements. All stars have helium-dominated atmospheres with hardly any hydrogen and temperatures between 42000 K and 47000 K while their surface gravity spans between log g = 5.4 and 5.7. CD-31∘ 4800 shows an enrichment of nitrogen and the characteristic pattern of hydrogen burning via the CNO-cycle, while the rest of the elements have about the solar abundance. This points to the slow merger of two helium white dwarfs as the most likely origin for this system. The other three stars are enriched in carbon, nitrogen and neon while their intermediate mass element’s abundance scatters around the solar value. They were possibly formed in the deep mixing late hot flasher scenario.
Facultad de Ciencias Astronómicas y Geofísicas
description The chemical composition of helium-rich hot subluminous O stars plays an important role to understand and model their formation history. We present a spectroscopic analysis of four He-sdO stars,CD-31∘ 4800, [CW83] 0904- 02, LSS 1274 and LS IV +10∘ 9. The analysis is based on archival optical and UV high-resolution spectra. We used Tlusty200/Synspec48 to compute line blanketed non-LTE model atmospheres and their corresponding synthetic spectra and derive the atmospheric parameters as well as the abundances of the most prominent elements. All stars have helium-dominated atmospheres with hardly any hydrogen and temperatures between 42000 K and 47000 K while their surface gravity spans between log g = 5.4 and 5.7. CD-31∘ 4800 shows an enrichment of nitrogen and the characteristic pattern of hydrogen burning via the CNO-cycle, while the rest of the elements have about the solar abundance. This points to the slow merger of two helium white dwarfs as the most likely origin for this system. The other three stars are enriched in carbon, nitrogen and neon while their intermediate mass element’s abundance scatters around the solar value. They were possibly formed in the deep mixing late hot flasher scenario.
publishDate 2018
dc.date.none.fl_str_mv 2018-02
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
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://sedici.unlp.edu.ar/handle/10915/78622
url http://sedici.unlp.edu.ar/handle/10915/78622
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/2543-6376
info:eu-repo/semantics/altIdentifier/doi/10.1515/astro-2018-0010
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-nd/4.0/
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
dc.format.none.fl_str_mv application/pdf
27-34
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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