The brightest pure-H ultracool white dwarf
The brightest pure-H ultracool white dwarf
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最亮的纯H超冷白矮星
DOI:
10.1051/0004-6361/201220191
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发表时间:
2012
影响因子:
6.5
通讯作者:
Catalán S
中科院分区:
文献类型:
--
作者:
Catalán S
We report the identification of LSR J0745+2627 in the United Kingdom InfraRed Telescope Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS) as a cool white dwarf with kinematics and age compatible with the thick-disk/halo population. LSR J0745+2627 has a high proper motion (890 mas/yr) and a high reduced proper motion value in theJband (HJ= 21.87). We show how the infrared-reduced proper motion diagram is useful for selecting a sample of cool white dwarfs with low contamination. LSR J0745+2627 is also detected in the Sloan Digital Sky Survey (SDSS) and the Wide-field Infrared Survey Explorer (WISE). We have spectroscopically confirmed this object as a cool white dwarf using X-Shooter on the Very Large Telescope. A detailed analysis of its spectral energy distribution reveals that its atmosphere is compatible with a pure-H composition model with an effective temperature of 3880 ± 90 K. This object is the brightest pure-H ultracool white dwarf (Teff< 4000 K) ever identified. We have constrained the distance (24–45 pc), space velocities and age considering different surface gravities. The results obtained suggest that LSR J0745+2627 belongs to the thick-disk/halo population and is also one of the closest ultracool white dwarfs.
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DOI:
10.1086/317235
发表时间:
2000
期刊:
The Astrophysical Journal
影响因子:
--
作者:
M. Salaris;E. García–Berro;M. Hernanz;J. Isern;D. S. L. Jmu;Upc Barcelona;IEEC;Vanderbilt University
通讯作者:
Vanderbilt University
DOI:
10.1086/312955
发表时间:
1997
期刊:
The Astrophysical Journal Supplement Series
影响因子:
--
作者:
Pierre Bergeron;M. Ruiz;Sandy Leggett
通讯作者:
Sandy Leggett
DOI:
10.1086/322316
发表时间:
2001
期刊:
The Astrophysical Journal
影响因子:
--
作者:
P. Bergeron
通讯作者:
P. Bergeron
DOI:
10.1088/0004-637x/696/2/2094
发表时间:
2009
期刊:
The Astrophysical Journal
影响因子:
--
作者:
M. Kilic;P. Kowalski;W. Reach;T. von Hippel
通讯作者:
T. von Hippel
DOI:
10.1088/0004-637x/692/2/1506
发表时间:
2008
期刊:
The Astrophysical Journal
影响因子:
--
作者:
N. Lodieu;S. Leggett;P. Bergeron;A. Nitta
通讯作者:
A. Nitta