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J/AJ/130/734  Magnetic white dwarfs from SDSS DR2 and DR3 (Vanlandingham+, 2005)

Magnetic white dwarfs from the SDSS. II. The second and third data releases. Vanlandingham K.M., Schmidt G.D., Eisenstein D.J., Harris H.C., Anderson S.F., Hall P.B., Liebert J., Schneider D.P., Silvestri N.M., Stinson G.S., Wolfe M.A. <Astron. J., 130, 734-741 (2005)> =2005AJ....130..734V
ADC_Keywords: Stars, white dwarf ; Magnetic fields ; Photometry, SDSS Keywords: stars: magnetic fields - white dwarfs Abstract: Fifty-two magnetic white dwarfs have been identified in spectroscopic observations from the Sloan Digital Sky Survey (SDSS) obtained between mid-2002 and the end of 2004, including Data Releases 2 and 3. Although not as numerous or diverse as the discoveries from the first data release, the collection exhibits polar field strengths ranging from 1.5 to ∼1000MG and includes two new unusual atomic DQA examples, a molecular DQ, and five stars that show hydrogen in fields above 500MG. The highest field example, SDSS J2346+3853, may be the most strongly magnetic white dwarf yet discovered. Analysis of the photometric data indicates that the magnetic sample spans the same temperature range as for non-magnetic white dwarfs from the SDSS, and support is found for previous claims that magnetic white dwarfs tend to have larger masses than their non-magnetic counterparts. A glaring exception to this trend is the apparently low-gravity object SDSS J0933+1022, which may have a history involving a close binary companion. Description: We use SDSS data ( Additional optical spectroscopy and spectropolarimetry were obtained during the period 2004 February-December for several unusual and questionable targets. These observations utilized the instrument SPOL attached to the Steward Observatory 2.3m Bok Telescope on Kitt Peak and the 6.5m MMT atop Mount Hopkins. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 108 52 New SDSS magnetic white dwarfs table2.dat 56 52 Photometry of SDSS magnetic white dwarfs
See also: II/259 : The SDSS Photometric Catalog, Release 3 (Abazajian+ 2005) : SDSS Home page Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 19 A19 --- SDSS SDSS designation ( 21- 24 I4 --- Plate SDSS Plate number 25 A1 --- --- [-] 26- 30 I5 --- MJD SDSS MJD number observation date 31 A1 --- --- [-] 32- 34 I3 --- Fiber SDSS Fiber number 36- 45 A10 "YYYY/MM/DD" TAI observation date 47- 51 A5 "h:m" Obs.time TAI time of observation 53- 58 F6.1 hT Bp ?=- Magnetic field strength (in 106G) 59 A1 --- u_Bp [*] * when e_Bp>10% 61- 62 I2 deg i ?=- Inclination angle of the dipole axis, 63 A1 --- u_i [*] * when e_incl>10% 65-108 A44 --- Com Comments
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 19 A19 --- SDSS SDSS designation ( 20 A1 --- n_SDSS [*] Individual note (1) 21- 25 F5.2 mag umag SDSS u magnitude 27- 31 F5.2 mag gmag SDSS g magnitude 33- 37 F5.2 mag rmag SDSS r magnitude 39- 43 F5.2 mag imag SDSS i magnitude 45- 49 F5.2 mag zmag SDSS z magnitude 51- 55 I5 K Teff ?=- Effective temperature (2) 56 A1 --- n_Teff [*] when e_Teff>1000K
Note (1): J095442.91+091352.4 corrected into J095442.91+091354.4 (to fit to table1) Note (2): Temperature based on ugriz fiber magnitudes of 17.40, 17.30, 17.60, 17.88, and 18.21, respectively.
History: From electronic version of the journal References: Schmidt et al., Paper I 2003ApJ...595.1101S
(End) Patricia Vannier [CDS] 09-Oct-2008
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