Abundance analyses of three helium-rich sdB stars

N. Naslim; C. S. Jeffery; A. Ahmad; N. Behara; T. Şahìn

doi:10.1007/s10509-010-0334-x

Abundance analyses of three helium-rich sdB stars

N. Naslim, C. S. Jeffery, A. Ahmad, N. Behara, T. Şahìn

Research output: Contribution to journal › Article › peer-review

Abstract

As part of an extended study of the surface abundances of extremely helium-rich hot subdwarfs, high-resolution optical échelle spectra of the three helium-rich subdwarf B stars LB 1766, SB 21 and BPS 22940-0009 are presented. Opacity-sampled line-blanketed model atmospheres have been used to derive atmospheric properties and surface abundances. All three stars are moderately metal-poor compared with the Sun ([Fe/H]≈-0. 4). The first two stars are nitrogen-rich He-sdBs, while the third is a carbon-rich He-sdB. The surface composition and locus of single N-rich He-sdBs are currently best explained by the merger of two helium white dwarfs. C-rich He-sdBs require further investigation.

Original language	English
Pages (from-to)	119-125
Number of pages	7
Journal	Astrophysics and Space Science
Volume	329
Issue number	1
DOIs	https://doi.org/10.1007/s10509-010-0334-x
Publication status	Published - 2010
Externally published	Yes

Keywords

Abundances
Atmospheric parameters
Evolution
Helium-rich subdwarfs

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1007/s10509-010-0334-x

Cite this

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title = "Abundance analyses of three helium-rich sdB stars",

abstract = "As part of an extended study of the surface abundances of extremely helium-rich hot subdwarfs, high-resolution optical {\'e}chelle spectra of the three helium-rich subdwarf B stars LB 1766, SB 21 and BPS 22940-0009 are presented. Opacity-sampled line-blanketed model atmospheres have been used to derive atmospheric properties and surface abundances. All three stars are moderately metal-poor compared with the Sun ([Fe/H]≈-0. 4). The first two stars are nitrogen-rich He-sdBs, while the third is a carbon-rich He-sdB. The surface composition and locus of single N-rich He-sdBs are currently best explained by the merger of two helium white dwarfs. C-rich He-sdBs require further investigation.",

keywords = "Abundances, Atmospheric parameters, Evolution, Helium-rich subdwarfs",

author = "N. Naslim and Jeffery, {C. S.} and A. Ahmad and N. Behara and T. {\c S}ah{\`i}n",

year = "2010",

doi = "10.1007/s10509-010-0334-x",

language = "English",

volume = "329",

pages = "119--125",

journal = "Astrophysics and Space Science",

issn = "0004-640X",

publisher = "Springer Netherlands",

number = "1",

}

TY - JOUR

T1 - Abundance analyses of three helium-rich sdB stars

AU - Naslim, N.

AU - Jeffery, C. S.

AU - Ahmad, A.

AU - Behara, N.

AU - Şahìn, T.

PY - 2010

Y1 - 2010

N2 - As part of an extended study of the surface abundances of extremely helium-rich hot subdwarfs, high-resolution optical échelle spectra of the three helium-rich subdwarf B stars LB 1766, SB 21 and BPS 22940-0009 are presented. Opacity-sampled line-blanketed model atmospheres have been used to derive atmospheric properties and surface abundances. All three stars are moderately metal-poor compared with the Sun ([Fe/H]≈-0. 4). The first two stars are nitrogen-rich He-sdBs, while the third is a carbon-rich He-sdB. The surface composition and locus of single N-rich He-sdBs are currently best explained by the merger of two helium white dwarfs. C-rich He-sdBs require further investigation.

AB - As part of an extended study of the surface abundances of extremely helium-rich hot subdwarfs, high-resolution optical échelle spectra of the three helium-rich subdwarf B stars LB 1766, SB 21 and BPS 22940-0009 are presented. Opacity-sampled line-blanketed model atmospheres have been used to derive atmospheric properties and surface abundances. All three stars are moderately metal-poor compared with the Sun ([Fe/H]≈-0. 4). The first two stars are nitrogen-rich He-sdBs, while the third is a carbon-rich He-sdB. The surface composition and locus of single N-rich He-sdBs are currently best explained by the merger of two helium white dwarfs. C-rich He-sdBs require further investigation.

KW - Abundances

KW - Atmospheric parameters

KW - Evolution

KW - Helium-rich subdwarfs

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U2 - 10.1007/s10509-010-0334-x

DO - 10.1007/s10509-010-0334-x

M3 - Article

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SN - 0004-640X

VL - 329

SP - 119

EP - 125

JO - Astrophysics and Space Science

JF - Astrophysics and Space Science

IS - 1

ER -

Abundance analyses of three helium-rich sdB stars

Abstract

Keywords

ASJC Scopus subject areas

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