LP 400-22, A Very Low Mass and High-Velocity White Dwarf

Adela Kawka; Stephane Vennes; Terry D. Oswalt; J. Allyn Smith; Nicole M. Silvestri

doi:10.1086/505143

LP 400-22, A Very Low Mass and High-Velocity White Dwarf

Adela Kawka, Stephane Vennes, Terry D. Oswalt, J. Allyn Smith, Nicole M. Silvestri

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

Abstract

We report the identification of LP 400-22 (WD 2234 + 222) as a very low mass and high-velocity white dwarf. The ultraviolet GALEX and optical photometric colors and a spectral line analysis of LP 400-22 show this star to have an effective temperature of 11,080 ± 140 K and a surface gravity of log g p 6.32 ± 0.08. Therefore, this is a helium-core white dwarf with a mass of 0.17 M _Ꙩ . The tangential velocity of this white dwarf is 414 ± 43 km s ^-1 , making it one of the fastest moving white dwarfs known. We discuss probable evolutionary scenarios for this remarkable object.

Original language	American English
Journal	The Astrophysical Journal
Volume	643
DOIs	https://doi.org/10.1086/505143
State	Published - Jun 1 2006
Externally published	Yes

Keywords

stars: atmospheres
stars: individual (LP 400-22)
white dwarfs

Disciplines

Stars, Interstellar Medium and the Galaxy

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10.1086/505143License: CC BY

LP 400-22 A Very Low Mass and High-Velocity White DwarfFinal published version, 683 KBLicense: CC BY

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@article{2b092df98e5c423e97f76f2ee2df0116,

title = "LP 400-22, A Very Low Mass and High-Velocity White Dwarf",

abstract = " We report the identification of LP 400-22 (WD 2234 + 222) as a very low mass and high-velocity white dwarf. The ultraviolet GALEX and optical photometric colors and a spectral line analysis of LP 400-22 show this star to have an effective temperature of 11,080 ± 140 K and a surface gravity of log g p 6.32 ± 0.08. Therefore, this is a helium-core white dwarf with a mass of 0.17 M Ꙩ . The tangential velocity of this white dwarf is 414 ± 43 km s -1 , making it one of the fastest moving white dwarfs known. We discuss probable evolutionary scenarios for this remarkable object.",

keywords = "stars: atmospheres, stars: individual (LP 400-22), white dwarfs",

author = "Adela Kawka and Stephane Vennes and Oswalt, {Terry D.} and Smith, {J. Allyn} and Silvestri, {Nicole M.}",

year = "2006",

month = jun,

day = "1",

doi = "10.1086/505143",

language = "American English",

volume = "643",

journal = "The Astrophysical Journal",

}

TY - JOUR

T1 - LP 400-22, A Very Low Mass and High-Velocity White Dwarf

AU - Kawka, Adela

AU - Vennes, Stephane

AU - Oswalt, Terry D.

AU - Smith, J. Allyn

AU - Silvestri, Nicole M.

PY - 2006/6/1

Y1 - 2006/6/1

N2 - We report the identification of LP 400-22 (WD 2234 + 222) as a very low mass and high-velocity white dwarf. The ultraviolet GALEX and optical photometric colors and a spectral line analysis of LP 400-22 show this star to have an effective temperature of 11,080 ± 140 K and a surface gravity of log g p 6.32 ± 0.08. Therefore, this is a helium-core white dwarf with a mass of 0.17 M Ꙩ . The tangential velocity of this white dwarf is 414 ± 43 km s -1 , making it one of the fastest moving white dwarfs known. We discuss probable evolutionary scenarios for this remarkable object.

AB - We report the identification of LP 400-22 (WD 2234 + 222) as a very low mass and high-velocity white dwarf. The ultraviolet GALEX and optical photometric colors and a spectral line analysis of LP 400-22 show this star to have an effective temperature of 11,080 ± 140 K and a surface gravity of log g p 6.32 ± 0.08. Therefore, this is a helium-core white dwarf with a mass of 0.17 M Ꙩ . The tangential velocity of this white dwarf is 414 ± 43 km s -1 , making it one of the fastest moving white dwarfs known. We discuss probable evolutionary scenarios for this remarkable object.

KW - stars: atmospheres

KW - stars: individual (LP 400-22)

KW - white dwarfs

UR - https://commons.erau.edu/publication/890

U2 - 10.1086/505143

DO - 10.1086/505143

M3 - Article

VL - 643

JO - The Astrophysical Journal

JF - The Astrophysical Journal

ER -

LP 400-22, A Very Low Mass and High-Velocity White Dwarf

Abstract

Keywords

Disciplines

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