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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 (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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 83 539 Magnetic white dwarf stars
See also: J/A+A/506/1341 : Magnetic fields in white dwarfs (Kuelebi+, 2009) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 19 A19 --- SDSS SDSS name ( 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 MG BHa ? Hα magnetic field 45- 48 F4.1 MG 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
Note (1): *: SDSS J125044.43+154957.36 is a Porb = 86 min binary (Breedt et al., 2012MNRAS.423.1437B). For those spectra we quote only their field determinations, as they fit the whole spectrum, keeping logg=8.0.
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 28-Jul-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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