J/AJ/135/1239 Spectral distances to DA white dwarfs (Holberg+, 2008)
Precise estimates of the synthetic spectral distances to DA white dwarfs.
Holberg J.B., Bergeron P., Gianninas A.
<Astron. J., 135, 1239-1248 (2008)>
=2008AJ....135.1239H 2008AJ....135.1239H
ADC_Keywords: Effective temperatures ; Parallaxes, trigonometric ; Spectroscopy
Photometry, SDSS ; Photometry, UBVRI ; Stars, white dwarf ;
Stars, distances
Keywords: stars: distances - white dwarfs - techniques: photometric
Abstract:
Using recent photometric calibrations, we develop greatly improved
distance estimates for DA white dwarfs using multi-band synthetic
photometry based on spectroscopic temperatures and gravities. Very
good correlations are shown to exist between our spectroscopically
based photometric distance estimates and those derived from
trigonometric parallaxes. We investigate the uncertainties involved in
our distance estimates, as well as discuss the circumstances where
such techniques are most likely to fail. We apply our techniques to
the large sample of Sloan Digital Sky Survey DA white dwarfs where
automated fitting of HI Balmer profiles yields spectrometric
temperatures and gravities. We determine simple empirical corrections
to these temperatures and gravities with respect to published slit
spectroscopy. After applying these Teff-logg corrections as well as
appropriate interstellar extinction corrections, where necessary, we
derive spectroscopically based photometric distances for 7062 DA stars
from this sample.
Description:
In Table 3, we provide our spectroscopic determinations of Teff and
logg, the uncertainty of these parameters, together with the UBVRI
magnitudes and uncertainties for a total of 26 parallaxes for 20
individual stars. For the most part, the spectroscopic determinations
have been taken from a consistent re-analysis of the stellar spectra.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 40 64 Trigonometric parallaxes
table3.dat 97 26 Johnson-Kron-Cousins UBVRI photometry
table4.dat 99 38 ugriz photometry
table5.dat 56 26 Distances from UBVRI photometry
table6.dat 65 38 Distances from ugriz photometry
table7.dat 82 70 SDSS autofit versus slit spectroscopic parameters
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See also:
J/ApJ/654/499 : H-rich white dwarfs spectropolarimetric survey (Kawka+, 2007)
J/A+A/466/627 : Parameters of DA white dwarfs in SDSS-DR1 (Hu+, 2007)
J/ApJS/167/40 : SDSS4 confirmed white dwarfs catalog (Eisenstein+, 2006)
J/AJ/132/1221 : VJHK and SDSS photometry of DA white dwarfs (Holberg+, 2006)
J/ApJ/643/402 : Cool white dwarfs in the solar neighborhood (Kawka+, 2006)
J/ApJS/156/47 : DA white dwarfs from the Palomar Green Survey (Liebert+, 2005)
J/ApJ/607/426 : Catalog of white dwarfs in SDSS-DR1 (Kleinman+, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [WD]
3- 10 A8 --- WD WD designation (HHMM+DDM, B1950)
12- 22 A11 --- OName Other name
24- 30 F7.5 arcsec pi Trigonometric parallaxe
32- 38 F7.5 arcsec e_pi pi uncertainty
40 I1 --- r_pi [1/2] Parallaxe reference (1)
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Note (1): References as follows:
1 = Van Altena et al. (1994, The Yale General Catalog of Trigonometric
Stellar Parallaxes);
2 = Perryman (1997, The Hipparcos catalog of trigonometric parallaxes,
Cat. I/239)
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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- 2 A2 --- --- [WD]
3- 10 A8 --- WD WD designation (HHMM+DDM, B1950)
12- 16 I5 K Teff Effective temperature
18- 20 I3 K e_Teff Temperature uncertainty
22- 26 F5.3 cm/s2 logg Surface gravity
28- 32 F5.3 cm/s2 e_logg logg uncertainty
34- 39 F6.3 mag Umag U band magnitude (1)
41- 45 F5.3 mag e_Umag Umag uncertainty
47- 52 F6.3 mag Bmag B band magnitude (1)
54- 58 F5.3 mag e_Bmag Bmag uncertainty
60- 65 F6.3 mag Vmag V band magnitude (1)
67- 71 F5.3 mag e_Vmag Vmag uncertainty
73- 78 F6.3 mag Rmag R band magnitude (1)
80- 84 F5.3 mag e_Rmag Rmag uncertainty
86- 91 F6.3 mag Imag I band magnitude (1)
93- 97 F5.3 mag e_Imag Imag uncertainty
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Note (1): The UBVRI magnitudes are taken from Table 11 of Holberg &
Bergeron, 2006, Cat. J/AJ/132/1221.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [WD]
3- 12 A10 --- WD WD designation (HHMM+DDM.N, B1950)
14- 18 I5 K Teff Effective temperature
20- 22 I3 K e_Teff Temperature uncertainty
24- 28 F5.3 cm/s2 logg Surface gravity
30- 34 F5.3 cm/s2 e_logg logg uncertainty
36- 41 F6.3 mag umag SDSS-DR5 u band magnitude
43- 47 F5.3 mag e_umag umag uncertainty
49- 54 F6.3 mag gmag SDSS-DR5 g band magnitude
56- 60 F5.3 mag e_gmag gmag uncertainty
62- 67 F6.3 mag rmag SDSS-DR5 r band magnitude
69- 73 F5.3 mag e_rmag rmag uncertainty
75- 80 F6.3 mag imag SDSS-DR5 i band magnitude
82- 86 F5.3 mag e_imag imag uncertainty
88- 93 F6.3 mag zmag SDSS-DR5 z band magnitude
95- 99 F5.3 mag e_zmag zmag uncertainty
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [WD]
3- 10 A8 --- WD WD designation (HHMM+DDM, B1950)
12- 16 F5.2 pc r(U) U-band heliocentric distance
18- 22 F5.2 pc r(B) B-band heliocentric distance
24- 28 F5.2 pc r(V) V-band heliocentric distance
30- 34 F5.2 pc r(R) R-band heliocentric distance
36- 40 F5.2 pc r(I) I-band heliocentric distance
42- 46 F5.2 pc r Mean heliocentric distance
48- 51 F4.2 pc e_r Mean distance uncertainty
53- 56 F4.2 pc Sdev Standard deviation of distance fit
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [WD]
3- 12 A10 --- WD WD designation (HHMM+DDM.N, B1950)
14- 19 F6.2 pc r(u) u-band heliocentric distance
21- 26 F6.2 pc r(g) g-band heliocentric distance
28- 33 F6.2 pc r(r) r-band heliocentric distance
35- 40 F6.2 pc r(i) i-band heliocentric distance
42- 47 F6.2 pc r(z) z-band heliocentric distance
49- 54 F6.2 pc r Mean heliocentric distance
56- 59 F4.2 pc e_r Mean distance uncertainty
61- 65 F5.2 pc Sdev Standard deviation of distance fit
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [WD]
3- 12 A10 --- WD WD designation (HHMM+DDM.N, B1950)
14- 17 A4 --- --- [SDSS]
19- 37 A19 --- SDSS SDSS designation (JHHMMSS.ss+DDMMSS.s)
39- 44 I6 K Teff1 Effective temperature from SDSS spectroscopy
46- 49 I4 K e_Teff1 Uncertainty on Teff1
51- 54 F4.2 [cm/s2] logg1 Surface gravity from SDSS spectroscopy
56- 60 F5.3 [cm/s2] e_logg1 Uncertainty on logg1
62- 66 I5 K Teff2 Effective temperature from slit spectroscopy
68- 71 I4 K e_Teff2 Uncertainty on Teff2
73- 76 F4.2 [cm/s2] logg2 Surface gravity from slit spectroscopy
78- 82 F5.3 [cm/s2] e_logg2 Uncertainty on logg2
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 05-Jul-2010