J/MNRAS/429/2934 SDSS magnetic white dwarf stars (Kepler+, 2013)
Magnetic white dwarf stars in the Sloan Digital Sky Survey.
Kepler S.O., Pelisoli I., Jordan S., Kleinman S.J., Koester D., Kulebi B.,
Pecanha V., Castanheira B.G., Nitta A., Costa J.E.S., Winget D.E.,
Kanaan A., Fraga L.
<Mon. Not. R. Astron. Soc., 429, 2934-2944 (2013)>
=2013MNRAS.429.2934K 2013MNRAS.429.2934K (SIMBAD/NED BibCode)
ADC_Keywords: Stars, white dwarf ; Magnetic fields
Keywords: stars: magnetic field - white dwarfs
Abstract:
To obtain better statistics on the occurrence of magnetism among white
dwarfs, we searched the spectra of the hydrogen atmosphere white dwarf
stars (DAs) in the Data Release 7 of the Sloan Digital Sky Survey
(SDSS) for Zeeman splittings and estimated the magnetic fields. We
found 521 DAs with detectable Zeeman splittings, with fields in the
range from around 1 to 733MG, which amounts to 4% of all DAs
observed. As the SDSS spectra have low signal-to-noise ratios, we
carefully investigated by simulations with theoretical spectra how
reliable our detection of magnetic field was.
Description:
We classified more than 48000 spectra, selected as possible white
dwarf stars from the SDSS DR7 by their colours, through visual
inspection and detected Zeeman splittings in 521 DA stars. Table 1
shows the estimated values for the magnetic fields for the 521 spectra
we measured.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 83 539 Magnetic white dwarf stars
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See also:
J/A+A/506/1341 : Magnetic fields in white dwarfs (Kuelebi+, 2009)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- SDSS SDSS name (HHMMSS.ss+DDMMSS.s)
20 A1 --- n_SDSS [*] Note on SDSS (1)
22- 25 I4 --- Plate SDSS Plate identifier
26 A1 --- --- [-]
27- 31 I5 d MJD SDSS MJD identifier
32 A1 --- --- [-]
33- 35 I3 --- Fiber SDSS Fiber identifier
37- 38 A2 --- l_BHa [≤ ] Limit flag on BHa
39- 43 F5.1 Mgauss BHa ? Hα magnetic field
45- 48 F4.1 Mgauss BHb ?=- Hβ magnetic field
49 A1 --- n_BHb [K] K for measured by Kuelebi et al. (2009,
Cat. J/A+A/506/1341)
51- 55 F5.2 --- S/N ? Signal-to-noise ratio
57- 61 F5.2 mag gmag ? SDSS g magnitude
63- 67 I5 K Teff ? Effective temperature
69- 72 I4 K e_Teff ? rms uncertainty on Teff
74- 78 F5.2 [cm/s2] logg ? Surface gravity
80- 83 F4.2 [cm/s2] e_logg ? rms uncertainty on logg
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Note (1): *: SDSS J125044.43+154957.36 is a Porb = 86 min binary (Breedt et al.,
2012MNRAS.423.1437B 2012MNRAS.423.1437B). For those spectra we quote only their field
determinations, as they fit the whole spectrum, keeping logg=8.0.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 28-Jul-2017