J/ApJ/743/138 Spectroscopic survey of bright white dwarfs (Gianninas+, 2011)
A spectroscopic survey and analysis of bright, hydrogen-rich white dwarfs.
Gianninas A., Bergeron P., Ruiz M.T.
<Astrophys. J., 743, 138 (2011)>
=2011ApJ...743..138G 2011ApJ...743..138G
ADC_Keywords: Stars, white dwarf ; Spectral types ; Effective temperatures ;
Surveys ; Spectroscopy
Keywords: binaries: spectroscopic - stars: fundamental parameters - surveys -
techniques: spectroscopic - white dwarfs
Abstract:
We have conducted a spectroscopic survey of over 1300 bright
(V≤17.5), hydrogen-rich white dwarfs based largely on the last
published version of the McCook & Sion (1999ApJS..121....1M 1999ApJS..121....1M, Cat.
III/235) catalog. The complete results from our survey, including the
spectroscopic analysis of over 1100 DA white dwarfs, are presented.
High signal-to-noise ratio optical spectra were obtained for each star
and were subsequently analyzed using our standard spectroscopic
technique where the observed Balmer line profiles are compared to
synthetic spectra computed from the latest generation of model
atmospheres appropriate for these stars. First, we present the
spectroscopic content of our sample, which includes many
misclassifications as well as several DAB, DAZ, and magnetic white
dwarfs. Next, we look at how the new Stark broadening profiles affect
the determination of the atmospheric parameters. When necessary,
specific models and analysis techniques are used to derive the most
accurate atmospheric parameters possible. In particular, we employ M
dwarf templates to obtain better estimates of the atmospheric
parameters for those white dwarfs that are in DA+dM binary systems.
Description:
The goal of our survey was to observe all the white dwarfs listed as
DA in McCook & Sion (1999ApJS..121....1M 1999ApJS..121....1M, Cat. III/235), including all
subtypes (DAB, DAH/P, DAO, DAZ, DA+dM), with a visual magnitude
V≤17.5. After nearly 8 years of observing, and a total of 19
observing runs in both the northern and southern hemispheres, we
succeeded in securing spectra for 1360 of the 1503 white dwarfs we had
selected.
726 spectra were obtained specifically for the purposes of this survey
since it began in 2003. Of those 726 spectra, 568 were obtained
between 2003 September and 2011 April at Steward Observatory's 2.3m
telescope equipped with the Boller & Chivens spectrograph (spectral
coverage from about 3000 to 5250Å at a resolution of ∼6Å (FWHM)).
An additional 18 spectra were obtained in 2006 April and 2007 January
at the 1.6m telescope of the Observatoire du Mont-Megantic.
Furthermore, a total of 140 spectra from the southern hemisphere were
secured during the course of two observing runs in 2007 March and 2007
October, respectively, at ESO's 3.6m telescope and at Carnegie
Observatories' 2.5m Irenee du Pont Telescope. There are also 169
spectra that were kindly provided by C. Moran (1999, private comm.).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 46 68 Misclassified objects
table3.dat 50 13 Parameters for magnetic white dwarfs
table4.dat 51 10 Parameters for cool white dwarfs
table5.dat 80 1265 Atmospheric parameters of DA white dwarfs from
McCook & Sion (1999ApJS..121....1M 1999ApJS..121....1M, Cat. III/235)
refs.dat 69 32 References
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See also:
III/235 : Spectroscopically Identified White Dwarfs (McCook+, 2008)
III/137 : Spectroscopically Identified Hot Subdwarf Stars (Kilkenny+ 1988)
II/207 : Palomar-Green catalog UV-excess stellar objects (Green+ 1986)
J/ApJS/204/5 : SDSS DR7 white dwarf catalog (Kleinman+, 2013)
J/ApJ/730/128 : Spectroscopy of DA WD from the SDSS-DR4 (Tremblay+, 2011)
J/ApJS/197/38 : The WIRED survey. II. (Debes+, 2011)
J/ApJ/712/585 : Apparent velocity measurements of DA WDs (Falcon+, 2010)
J/ApJ/714/1037 : White dwarfs from the Kiso survey (Limoges+, 2010)
J/ApJ/723/1072 : The ELM survey. I. Low-mass white dwarfs (Brown+, 2010)
J/ApJS/190/77 : Detailed analysis of cool WDs in the SDSS (Kilic+, 2010)
J/A+A/496/191 : Spectral analysis of 636 SDSS WD-M binaries (Heller+, 2009)
J/A+A/505/441 : UVES/VLT spectra of white dwarfs (Koester+, 2009)
J/AJ/135/1239 : Spectral distances to DA white dwarfs (Holberg+, 2008)
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/A+A/448/579 : Sample of confirmed WDs in GSC-II survey (Carollo+, 2006)
J/ApJ/643/402 : Cool white dwarfs in the solar neighborhood (Kawka+, 2006)
J/ApJ/631/1100 : Atmospheric parameters of DA white dwarfs (Gianninas+, 2005)
J/ApJS/161/394 : Low-luminosity companions to white dwarfs (Farihi+, 2005)
J/A+A/430/223 : Parameters of cool companions of sdB stars (Lisker+, 2005)
J/ApJS/156/47 : DA white dwarfs from the Palomar Green Survey (Liebert+, 2005)
J/AJ/130/734 : Magnetic WDs from SDSS DR2 and DR3 (Vanlandingham+, 2005)
J/ApJ/607/426 : Catalog of white dwarfs in SDSS-DR1 (Kleinman+, 2004)
J/ApJS/147/145 : IUE low-dispersion spectra of white dwarfs (Holberg+, 2003)
J/ApJS/133/413 : BVRIJHK photometry of cool white dwarfs (Bergeron+, 2001)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- WD Object name (HHMM+DDM.N)
12- 30 A19 --- OName Other designation
32- 36 A5 --- OSpT McCook & Sion (1999ApJS..121....1M 1999ApJS..121....1M,
Cat. III/235) spectral type
38- 43 A6 --- SpT New spectral type from this work
45- 46 I2 --- Ref Reference (see refs.dat file)
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- WD Object name (HHMM+DDM)
10- 23 A14 --- OName Other name
25- 30 F6.1 hT Bp Magnetic field strength (assuming a magnetic
dipole), in MGauss (106Gauss) = 100Teslas
32- 36 I5 K Teff Effective temperature
38- 41 F4.2 [cm/s2] logg ? Log of the surface gravity
43- 50 A8 --- Ref Reference(s) to the original analyses (see
refs.dat file)
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Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- WD Object name (HHMM+DDMA)
11- 13 A3 --- f_WD DAZ indication for WD 1729+371
15- 23 A9 --- OName Other name
25- 29 I5 K Teff Effective temperature
31- 34 F4.2 [cm/s2] logg ? Log of the surface gravity
36- 39 F4.2 Msun Mass ? Mass of the white dwarf
41- 45 F5.2 mag VMag ? Absolute visual magnitude
47- 51 A5 --- Ref Reference(s) (see refs.dat file)
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Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- WD Coordinate based identifier (HHMM+DDM.N)
12- 26 A15 --- OName Other name
28- 33 A6 --- SpT Spectral type
35- 40 I6 K Teff Effective temperature
42- 45 I4 K e_Teff Uncertainty in Teff
47- 50 F4.2 [cm/s2] logg Log of the surface gravity
52- 55 F4.2 [cm/s2] e_logg Uncertainty in logg
57- 60 F4.2 Msun Mass Mass of the white dwarf
62- 65 F4.2 Msun e_Mass Uncertainty in Mass
67- 71 F5.2 mag VMag Absolute V band magnitude
73- 76 I4 pc Dist Distance
78- 80 A3 --- Notes Notes (1)
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Note (1): Notes numbered as follows:
1 = Photometrically constant;
2 = DA+dM binary;
3 = ZZ Ceti;
4 = Balmer-line problem;
5 = based on non-magnetic models;
6 = DA+DC binary;
7 = DA+DB binary;
8 = Suffers from interstellar reddening.
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Byte-by-byte Description of file: refs.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Ref Reference code
4- 22 A19 --- BibCode Bibcode
24- 49 A26 --- Aut Author's name(s)
51- 69 A19 --- Comm Comment
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 07-May-2013