J/ApJ/657/1013 IR photometry of 2MASS/Spitzer white dwarfs (Tremblay+, 2007)
Infrared photometric analysis of white dwarfs from the Two Micron All Sky
Survey and the Spitzer Space Telescope.
Tremblay P.-E., Bergeron P.
<Astrophys. J., 657, 1013-1025 (2007)>
=2007ApJ...657.1013T 2007ApJ...657.1013T
ADC_Keywords: Stars, double and multiple ; Stars, white dwarf ;
Photometry, infrared
Keywords: binaries: general - infrared: stars -
planetary systems: protoplanetary disks -
stars: fundamental parameters - white dwarfs
Abstract:
We review the available near- and mid-infrared photometry for white
dwarfs obtained from the Two Micron All Sky Survey (2MASS) and by the
Spitzer Space Telescope. Both data sets have recently been used to
seek white dwarfs with infrared excesses due to the presence of
unresolved companions or circumstellar disks, and also to derive the
atmospheric parameters of cool white dwarfs. We first attempt to
evaluate the reliability of the 2MASS photometry by comparing it with
an independent set of published JHK CIT magnitudes for 160 cool white
dwarf stars, and also by comparing the data with the predictions of
detailed model atmosphere calculations. The possibility of using 2MASS
to identify unresolved M dwarf companions or circumstellar disks is
then discussed.
Description:
Our photometric sample used to compare against the 2MASS data is drawn
from the detailed photometric and spectroscopic analyses of Bergeron
et al. (1997ApJS..108..339B 1997ApJS..108..339B), Leggett et al. (1998ApJ...497..294L 1998ApJ...497..294L),
and Bergeron et al. (2001, Cat. J/ApJS/133/413), who obtained
improved atmospheric parameters of cool white dwarfs from a comparison
of optical BVRI and infrared JHK photometry with the predictions of
model atmospheres appropriate for these stars. We selected from these
studies 183 cool white dwarfs with infrared JHK magnitudes measured on
the CIT photometric system (with the exception of 0704-508, which
has no K measurement). This sample covers a range of effective
temperatures between and 13000K.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 83 160 Sample of cool white dwarfs with near-infrared
photometry
table3.dat 87 47 Sample of white dwarfs with predicted NIR
photometry
table4.dat 85 57 Sample of massive white dwarfs
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
III/235 : Spectroscopically Identified White Dwarfs (McCook+, 2008)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- WD White Dwarf coordinate identification
11- 21 A11 --- Name White Dwarf name
23- 27 F5.2 mag JmagC The CIT J band magnitude
28- 29 A2 --- f_JmagC [: ] Uncertainty flag on JmagC (1)
31- 35 F5.2 mag HmagC The CIT H band magnitude
36- 37 A2 --- f_HmagC [: ] Uncertainty flag on HmagC (1)
39- 43 F5.2 mag KmagC ? The CIT K band magnitude
44 A1 --- f_KmagC [: ] Uncertainty flag on KmagC (1)
46- 51 F6.3 mag Jmag2 The 2MASS J band magnitude
53- 57 F5.3 mag e_Jmag2 ? Uncertainty in Jmag2 (2)
59- 64 F6.3 mag Hmag2 The 2MASS H band magnitude
66- 70 F5.3 mag e_Hmag2 ? Uncertainty in Hmag2 (2)
72- 77 F6.3 mag Ksmag2 The 2MASS KS band magnitude
79- 83 F5.3 mag e_Ksmag2 ? Uncertainty in Ksmag2 (2)
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Note (1): CIT uncertainties are 5% except for the data marked ':' or
'::', which indicate 10% and 20% uncertainties, respectively.
Note (2): 2MASS magnitudes with blank uncertainties are lower limits.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- WD White Dwarf coordinate identification
10- 14 I5 K Teff Effective temperature (1)
15 A1 --- u_Teff Uncertainty flag on Teff (2)
17- 20 F4.2 [cm/s2] log(g) Log of the surface gravity (1)
21 A1 --- u_log(g) Uncertainty flag on log(g) (2)
23- 27 F5.2 mag Vmag The V band magnitude (3)
29- 34 F6.3 mag JmagP Predicted J band magnitude
36- 41 F6.3 mag HmagP Predicted H band magnitude
43- 48 F6.3 mag KsmagP Predicted KS band magnitude
50- 55 F6.3 mag Jmag2 The 2MASS J band magnitude
57- 61 F5.3 mag e_Jmag2 Uncertainty in Jmag2
63- 68 F6.3 mag Hmag2 The 2MASS H band magnitude
70- 74 F5.3 mag e_Hmag2 Uncertainty in Hmag2
76- 81 F6.3 mag Ksmag2 The 2MASS KS band magnitude
83- 87 F5.3 mag e_Ksmag2 Uncertainty in Ksmag2
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Note (1): Uncertainties of the atmospheric parameters are 1.2% in Teff
and 0.038dex in log(g).
Note (2): Contaminated by the companion in the visible and the
uncertainties are correspondingly larger.
Note (3): The V magnitudes are from various sources in the literature.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- WD White Dwarf coordinate identification (1)
10- 14 I5 K Teff Effective temperature (2)
16- 19 F4.2 solMass Mass Mass in solar units (2)
21- 25 F5.2 mag Vmag ? The V band magnitude
27- 32 F6.3 mag JmagP ? Predicted J band magnitude
34- 39 F6.3 mag HmagP ? Predicted H band magnitude
41- 46 F6.3 mag KsmagP ? Predicted KS band magnitude
48- 53 F6.3 mag Jmag2 The 2MASS J band magnitude
55- 59 F5.3 mag e_Jmag2 Uncertainty in Jmag2
61- 66 F6.3 mag Hmag2 The 2MASS H band magnitude
68- 72 F5.3 mag e_Hmag2 ? Uncertainty in Hmag2 (3)
74- 79 F6.3 mag Ksmag2 The 2MASS KS band magnitude
81- 85 F5.3 mag e_Ksmag2 ? Uncertainty in Ksmag2 (3)
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Note (1): WD 1443+337 identified to WD 1443+336 and
WD 1517+501 identified to WD 1517+502.
Note (2): Mean uncertainties of Teff and Mass are 1.2% and 0.03 solar mass,
respectively.
Note (3): 2MASS magnitudes with blank uncertainties are lower limits.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 08-Jan-2009