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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
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), Leggett et al. (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:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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)
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.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
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
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.
Byte-by-byte Description of file: table4.dat
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)
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.
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 08-Jan-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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