How accurately do we know the parameters of hot DA white dwarfs

R. Napiwotzki; P.J. Green; R. Saffer

How accurately do we know the parameters of hot DA white dwarfs

R. Napiwotzki, P.J. Green, R. Saffer

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Abstract

We present new determinations of effective temperature, surface gravity, and masses for a sample of hot DA white dwarfs selected from the EUVE and ROSAT Wide Field Camera bright source lists in the course of a near-IR survey for low mass companions. Our analysis, based on hydrogen NLTE model atmospheres, provides a map of LTE correction vectors, which allow a thorough comparision with previous LTE studies.We find previous analyses underestimate both the systematic errors and the observational scatter in the determination of white dwarf parameters via fits to model atmospheres.

Original language	English
Title of host publication	In: Procs of the 11th European Workshop on White Dwarfs, ASP Conference Series 169
Publisher	Astronomical Society of the Pacific
Pages	492-8
ISBN (Print)	1-886733-91-0
Publication status	Published - 1999

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@inproceedings{0027c53fa8514f16aa22a800548eb6c5,

title = "How accurately do we know the parameters of hot DA white dwarfs",

abstract = "We present new determinations of effective temperature, surface gravity, and masses for a sample of hot DA white dwarfs selected from the EUVE and ROSAT Wide Field Camera bright source lists in the course of a near-IR survey for low mass companions. Our analysis, based on hydrogen NLTE model atmospheres, provides a map of LTE correction vectors, which allow a thorough comparision with previous LTE studies.We find previous analyses underestimate both the systematic errors and the observational scatter in the determination of white dwarf parameters via fits to model atmospheres.",

author = "R. Napiwotzki and P.J. Green and R. Saffer",

note = "Original paper can be found at: http://www.astrosociety.org/pubs/cs/156-194.html--Copyright Astronomical Society of the Pacific",

year = "1999",

language = "English",

isbn = "1-886733-91-0",

pages = "492--8",

booktitle = "In: Procs of the 11th European Workshop on White Dwarfs, ASP Conference Series 169",

publisher = "Astronomical Society of the Pacific",

address = "United States",

}

TY - GEN

T1 - How accurately do we know the parameters of hot DA white dwarfs

AU - Napiwotzki, R.

AU - Green, P.J.

AU - Saffer, R.

N1 - Original paper can be found at: http://www.astrosociety.org/pubs/cs/156-194.html--Copyright Astronomical Society of the Pacific

PY - 1999

Y1 - 1999

N2 - We present new determinations of effective temperature, surface gravity, and masses for a sample of hot DA white dwarfs selected from the EUVE and ROSAT Wide Field Camera bright source lists in the course of a near-IR survey for low mass companions. Our analysis, based on hydrogen NLTE model atmospheres, provides a map of LTE correction vectors, which allow a thorough comparision with previous LTE studies.We find previous analyses underestimate both the systematic errors and the observational scatter in the determination of white dwarf parameters via fits to model atmospheres.

AB - We present new determinations of effective temperature, surface gravity, and masses for a sample of hot DA white dwarfs selected from the EUVE and ROSAT Wide Field Camera bright source lists in the course of a near-IR survey for low mass companions. Our analysis, based on hydrogen NLTE model atmospheres, provides a map of LTE correction vectors, which allow a thorough comparision with previous LTE studies.We find previous analyses underestimate both the systematic errors and the observational scatter in the determination of white dwarf parameters via fits to model atmospheres.

M3 - Conference contribution

SN - 1-886733-91-0

SP - 492

EP - 498

BT - In: Procs of the 11th European Workshop on White Dwarfs, ASP Conference Series 169

PB - Astronomical Society of the Pacific

ER -

How accurately do we know the parameters of hot DA white dwarfs

Abstract

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