J/AJ/132/1221 VJHK and SDSS photometry of DA white dwarfs (Holberg+, 2006)
Calibration of synthetic photometry using DA white dwarfs.
Holberg J.B., Bergeron P.
<Astron. J., 132, 1221-1233 (2006)>
=2006AJ....132.1221H 2006AJ....132.1221H
ADC_Keywords: Stars, white dwarf ; Photometry, SDSS ; Photometry, infrared
Keywords: standards - stars: fundamental parameters - stars: individual (Vega) -
techniques: photometric - white dwarfs
Abstract:
We have calibrated four major ground-based photometric systems with
respect to the Hubble Space Telescope (HST) absolute flux scale, which
is defined by Vega and four fundamental DA white dwarfs. These
photometric systems include the Johnson-Kron-Cousins UBVRI, the
Stroemgren uvby filters, the Two Micron All Sky Survey JHKs, and the
Sloan Digital Sky Survey ugriz filters. Synthetic magnitudes are
calculated from model white dwarf spectra folded through the published
filter response functions; these magnitudes in turn are absolutely
calibrated with respect to the HST flux scale. Effective
zero-magnitude fluxes and zero-point offsets of each system are
determined. In order to verify the external observational consistency,
as well as to demonstrate the applicability of these definitions, the
synthetic magnitudes are compared with the respective observed
magnitudes of larger sets of DA white dwarfs that have well-determined
effective temperatures and surface gravities and span a wide range in
both of these parameters.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table13.dat 53 188 Observed 2MASS Magnitudes and Model Input Parameters
table14.dat 60 175 Observed SDSS Magnitudes and Model Input Parameters
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
http://www.sdss.org/ : SDSS Home Page
Byte-by-byte Description of file: table13.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- WD White dwarf identification
14- 18 I5 K Teff Effective temperature
20- 23 F4.2 [cm/s2] log(g) Log of the surface gravity
25- 30 F6.3 mag Vmag The V band magnitude
32- 37 F6.3 mag Jmag 2MASS J band magnitude
39- 44 F6.3 mag Hmag ? 2MASS H band magnitude
46- 51 F6.3 mag Kmag ? 2MASS K band magnitude
53 A1 --- Note [*] Correction of WD0134+883 into WD0134+833
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Byte-by-byte Description of file: table14.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- WD White dwarf identification
14- 19 I6 K Teff Effective temperature
21- 25 F5.3 [cm/s2] log(g) Log of the surface gravity
27- 32 F6.3 mag umag SDSS u band magnitude
34- 39 F6.3 mag gmag SDSS g band magnitude
41- 46 F6.3 mag rmag SDSS r band magnitude
48- 53 F6.3 mag imag SDSS i band magnitude
55- 60 F6.3 mag zmag SDSS z band magnitude
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 25-Apr-2008