J/ApJ/631/1100 Atmospheric parameters of DA white dwarfs (Gianninas+, 2005)
Toward an empirical determination of the ZZ Ceti instability strip.
Gianninas A., Bergeron P., Fontaine G.
<Astrophys. J., 631, 1100-1112 (2005)>
=2005ApJ...631.1100G 2005ApJ...631.1100G
ADC_Keywords: Stars, white dwarf ; Effective temperatures ; Stars, masses
Keywords: stars: individual (G232-38) - stars: oscillations - white dwarfs
Abstract:
We present atmospheric parameters for a large sample of DA white
dwarfs that are known to be photometrically constant. For each star,
we determine the effective temperature and surface gravity by
comparing high signal-to-noise ratio optical spectra to the
predictions of detailed model atmosphere calculations. We also report
the successful prediction and detection of photometric variability in
G232-38 based on similar Teff and logg determinations. The
atmospheric parameters derived for this sample of constant stars, as
well as those for the known sample of bright ZZ Ceti stars (now
boosted to a total of 39), have been obtained in a highly homogeneous
way.
Description:
Our sample of photometrically constant DA stars is composed of 121
objects gathered from various sources.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 66 121 Atmospheric parameters of photometrically
constant DA white dwarfs
table2.dat 48 4 Atmospheric Parameters of ZZ Ceti stars
refs.dat 166 14 References
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See also:
III/235 : Spectroscopically Identified White Dwarfs (McCook+, 2006)
J/ApJS/156/47 : DA white dwarfs from Palomar Green Survey (Liebert+, 2005)
J/MNRAS/335/673 : DA white dwarfs in 2dF QSO Redshift Survey (Vennes+, 2002)
Byte-by-byte Description of file: table?.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- WD WD designation (HHMM+DDd, B1950)
9 A1 --- n_WD [abcd] Note on WD (1)
11- 24 A14 --- Name Other Name
26- 30 I5 K Teff Effective temperature
31 A1 --- u_Teff Uncertainty flag on Teff
33- 36 F4.2 [cm/s2] logg Surface gravity
37 A1 --- u_logg Uncertainty flag on logg
39- 42 F4.2 solMass Mass Stellar Mass
44- 48 F5.2 mag VMAG Absolute visual magnitude
50- 66 A17 --- Ref References
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Note (1): Notes as follows:
a = Double degenerate
b = Composite spectrum
c = Magnetic
d = Based on a new spectroscopic observation
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode BibCode
24- 48 A25 --- Aut Author's name
51-168 A118 --- Com Comments
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 11-Sep-2006