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J/ApJS/133/413 BVRIJHK photometry of cool white dwarfs (Bergeron+, 2001)
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Photometric and spectroscopic analysis of cool white dwarfs with
trigonometric parallax measurements.
Bergeron P., Leggett S.K., Ruiz M.T.
<Astrophys. J. Suppl. Ser. 133, 413 (2001)>
=2001ApJS..133..413B
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ADC_Keywords: Stars, white dwarf ; Photometry, UBVRI ; Photometry, infrared ;
Parallaxes, trigonometric
Keywords: stars: abundances - stars: atmospheres - stars: evolution -
stars: fundamental parameters - white dwarfs
Abstract:
A detailed photometric and spectroscopic analysis of cool
(T_eff_<~12000K) white dwarf stars is presented. The sample has been
drawn from the Yale Parallax Catalog and from a proper motion survey
in the southern hemisphere. Optical BVRI and infrared JHK photometry,
as well as spectroscopy at H{alpha}, have been secured for a sample of
152 white dwarfs. The discovery of seven new DA white dwarfs, two new
DQ white dwarfs, one new magnetic white dwarf, and three weak magnetic
white dwarf candidates, is reported. Our sample also identifies 19
known or suspected double degenerates.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 103 152 Observational Results
table2.dat 80 150 Atmospheric Parameters of Cool White Dwarfs
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See also:
III/210 : Spectroscopically Identified White Dwarfs (McCook+, 1999)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- WD White Dwarf number (HHMM+DDd, Cat. III/210)
9 A1 --- m_WD Multiplicity index on WD
11- 21 A11 --- Name White Dwarf name
23- 27 F5.1 mas plx Trigonometric parallax
29- 32 F4.1 mas e_plx Uncertainty in plx
34- 38 F5.2 0.1nm EWHalpha H{alpha} equivalent width in {AA} (1)
40- 44 F5.2 mag Vmag The Cousins V band magnitude (2)
45 A1 --- u_Vmag Indicates a 10% uncertainty in Vmag
47- 51 F5.2 mag B-V ? The Cousins B-V color (2)
52 A1 --- u_B-V Indicates a 10% uncertainty in B-V
54- 58 F5.2 mag V-R ? The Cousins V-R color (2)
59 A1 --- u_V-R Indicates a 10% uncertainty in V-R
61- 65 F5.2 mag V-I ? The Cousins V-I color (2)
66 A1 --- u_V-I Indicates a 10% uncertainty in V-I
68 I1 --- o_Vmag Number of independent BVRI observations
70- 74 F5.2 mag Jmag ? The CIT J band magnitude (2)
75 A1 --- u_Jmag Indicates a 10% uncertainty in Jmag
77- 81 F5.2 mag J-H ? The CIT J-H color (2)
82 A1 --- u_J-H Indicates a 10% uncertainty in J-H
84- 88 F5.2 mag H-K ? The CIT H-K color (2)
89 A1 --- u_H-K Indicates a 10% uncertainty in H-K
91 I1 --- o_Jmag Number of independent JHK observations
93-102 A10 --- n_Name Notes on Name (3)
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Note (1): A value of zero implies a featureless spectrum near the H{alpha}
region; for the magnetic DA stars, the equivalent width is taken as
the sum of the three Zeeman components.
Note (2): The photometric uncertainties are typically 3% at V, R, and I, and
5% elsewhere.
Note (3): Notes:
1 = In common with Bergeron et al. (1997ApJS..108..339B)
2 = plx from Yale Parallax Catalog
3 = Spectrum from Schmidt & Smith (1994ApJ...423L..63S)
4 = Magnetic
5 = In common with Leggett et al. (1998ApJ...497..294L)
6 = Spectrum from Greenstein & McCarthy (1985ApJ...289..732G)
7 = Newly identified DA white dwarf
8 = Vmag and B-V from McCook & Sion (1999, Cat. <III/210>)
9 = plx from Ruiz (1996AJ....111.1267R)
10 = plx from Ruiz et al. (1989, IAU Colloq. 114, 122)
11 = plx from Ruiz et al. (1995ApJ...455L.159R)
12 = plx from Liebert et al. (1988ApJ...332..891L)
13 = Not analyzed (see text)
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- WD White Dwarf number (HHMM+DDd)
9 A1 --- m_WD Multiplicity index on WD
11- 15 I5 K Teff Effective temperature
17- 19 I3 K e_Teff Uncertainty in Teff (1)
21- 24 F4.2 [cm/s2] log(g) Log of the surface gravity
26- 29 F4.2 [cm/s2] e_log(g) Uncertainty in log(g) (2)
31- 32 A2 --- Comp The dominant atmospheric constituent
34- 37 F4.2 solMass Mass Mass in solar units
39- 42 F4.2 solMass e_Mass Uncertainty in Mass (2)
44- 48 F5.2 mag VMag Absolute V band magnitude
50- 53 F4.2 mag e_VMag Uncertainty in VMag (2)
55- 59 F5.2 [solLum] Lum Luminosity (log) in solar units
61- 64 F4.2 [solLum] e_Lum Uncertainty in Lum (2)
66- 69 F4.2 Gyr Age White Dwarf cooling age (3)
71- 74 F4.2 Gyr e_Age Uncertainty in Age (2)
76- 80 A5 --- n_WD Notes on WD (4)
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Note (1): Derived directly from the fits to the energy distributions.
Note (2): Derived by propagating the error of the trigonometric parallax
uncertainty.
Note (3): Does not include the main sequence lifetime.
Note (4):
1 = Energy distribution better reproduced with pure hydrogen models (yet
no H{alpha}
2 = Magnetic
3 = C_2_H star
4 = DQ star
5 = DZ star
6 = Known or suspected double degenerate binary
7 = ZZ Ceti star
8 = Helium solution adopted despite hydrogen-rich atmosphere (see text).
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History:
From electronic version of the journal
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(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 08-Jun-2001