Chemical fingerprints of He-sdO stars

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...

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Autores principales: Schindewolf, Markus, Németh, Peter, Heber, Ulrich, Battich, Tiara, Miller Bertolami, Marcelo Miguel, Latour, Marilyn
Formato: Articulo
Lenguaje:Inglés
Publicado: 2018
Materias:
Astronomía
subdwarfs
abundances
He-sdO
hot flasher
slow merger
atmospheric parameters
stellar atmospheres
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/78622
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-78622
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Astronomía
subdwarfs
abundances
He-sdO
hot flasher
slow merger
atmospheric parameters
stellar atmospheres
spellingShingle Astronomía
subdwarfs
abundances
He-sdO
hot flasher
slow merger
atmospheric parameters
stellar atmospheres
Schindewolf, Markus
Németh, Peter
Heber, Ulrich
Battich, Tiara
Miller Bertolami, Marcelo Miguel
Latour, Marilyn
Chemical fingerprints of He-sdO stars
topic_facet Astronomía
subdwarfs
abundances
He-sdO
hot flasher
slow merger
atmospheric parameters
stellar atmospheres
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.
format Articulo
Articulo
author Schindewolf, Markus
Németh, Peter
Heber, Ulrich
Battich, Tiara
Miller Bertolami, Marcelo Miguel
Latour, Marilyn
author_facet Schindewolf, Markus
Németh, Peter
Heber, Ulrich
Battich, Tiara
Miller Bertolami, Marcelo Miguel
Latour, Marilyn
author_sort Schindewolf, Markus
title Chemical fingerprints of He-sdO stars
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
publishDate 2018
url http://sedici.unlp.edu.ar/handle/10915/78622
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AT nemethpeter chemicalfingerprintsofhesdostars
AT heberulrich chemicalfingerprintsofhesdostars
AT battichtiara chemicalfingerprintsofhesdostars
AT millerbertolamimarcelomiguel chemicalfingerprintsofhesdostars
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