A NLTE model atmosphere analysis of the pulsating sdO star SDSS J1600+0748

M. Latour; G. Fontaine; P. Brassard; P. Chayer; E. M. Green

doi:10.1007/s10509-010-0343-9

A NLTE model atmosphere analysis of the pulsating sdO star SDSS J1600+0748

M. Latour, G. Fontaine, P. Brassard, P. Chayer, E. M. Green

Steward Observatory

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

5 Scopus citations

Abstract

We started a program to construct several grids of suitable model atmospheres and synthetic spectra for hot subdwarf O stars computed, for comparative purposes, in LTE, NLTE, with and without metals. For the moment, we use our grids to perform fits on our spectrum of SDSS J160043. 6+074802. 9 (J1600+0748 for short), this unique pulsating sdO star. Our best fit is currently obtained with NLTE model atmospheres including carbon, nitrogen and oxygen in solar abundances, which leads to the following parameters for SDSS J1600+0748: T_eff=69060±2080 K, log g=6. 00±0. 09 and log N(He)/N(H)=-0. 61±0. 06. Improvements are needed, however, particularly for fitting the available He ii lines. It is hoped that the inclusion of Fe will help remedy the situation.

Original language	English (US)
Pages (from-to)	141-144
Number of pages	4
Journal	Astrophysics and Space Science
Volume	329
Issue number	1
DOIs	https://doi.org/10.1007/s10509-010-0343-9
State	Published - 2010

Keywords

Hot subdwarfs stars
Model atmospheres
SDSS J160043.6+074802.9

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1007/s10509-010-0343-9

Cite this

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title = "A NLTE model atmosphere analysis of the pulsating sdO star SDSS J1600+0748",

abstract = "We started a program to construct several grids of suitable model atmospheres and synthetic spectra for hot subdwarf O stars computed, for comparative purposes, in LTE, NLTE, with and without metals. For the moment, we use our grids to perform fits on our spectrum of SDSS J160043. 6+074802. 9 (J1600+0748 for short), this unique pulsating sdO star. Our best fit is currently obtained with NLTE model atmospheres including carbon, nitrogen and oxygen in solar abundances, which leads to the following parameters for SDSS J1600+0748: Teff=69060±2080 K, log g=6. 00±0. 09 and log N(He)/N(H)=-0. 61±0. 06. Improvements are needed, however, particularly for fitting the available He ii lines. It is hoped that the inclusion of Fe will help remedy the situation.",

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AU - Latour, M.

AU - Fontaine, G.

AU - Brassard, P.

AU - Chayer, P.

AU - Green, E. M.

PY - 2010

Y1 - 2010

N2 - We started a program to construct several grids of suitable model atmospheres and synthetic spectra for hot subdwarf O stars computed, for comparative purposes, in LTE, NLTE, with and without metals. For the moment, we use our grids to perform fits on our spectrum of SDSS J160043. 6+074802. 9 (J1600+0748 for short), this unique pulsating sdO star. Our best fit is currently obtained with NLTE model atmospheres including carbon, nitrogen and oxygen in solar abundances, which leads to the following parameters for SDSS J1600+0748: Teff=69060±2080 K, log g=6. 00±0. 09 and log N(He)/N(H)=-0. 61±0. 06. Improvements are needed, however, particularly for fitting the available He ii lines. It is hoped that the inclusion of Fe will help remedy the situation.

AB - We started a program to construct several grids of suitable model atmospheres and synthetic spectra for hot subdwarf O stars computed, for comparative purposes, in LTE, NLTE, with and without metals. For the moment, we use our grids to perform fits on our spectrum of SDSS J160043. 6+074802. 9 (J1600+0748 for short), this unique pulsating sdO star. Our best fit is currently obtained with NLTE model atmospheres including carbon, nitrogen and oxygen in solar abundances, which leads to the following parameters for SDSS J1600+0748: Teff=69060±2080 K, log g=6. 00±0. 09 and log N(He)/N(H)=-0. 61±0. 06. Improvements are needed, however, particularly for fitting the available He ii lines. It is hoped that the inclusion of Fe will help remedy the situation.

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KW - Model atmospheres

KW - SDSS J160043.6+074802.9

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A NLTE model atmosphere analysis of the pulsating sdO star SDSS J1600+0748

Abstract

Keywords

ASJC Scopus subject areas

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