J/MNRAS/455/3413 New white dwarf and subdwarf stars in SDSS DR12 (Kepler+, 2016)
New white dwarf and subdwarf stars in the Sloan Digital Sky Survey
Data Release 12.
Kepler S.O., Pelisoli I., Koester D., Ourique G., Romero A.D., Reindl N.,
Kleinman S.J., Eisenstein D.J., Valois A.D.M., Amaral L.A.
<Mon. Not. R. Astron. Soc., 455, 3413-3423 (2016)>
=2016MNRAS.455.3413K 2016MNRAS.455.3413K (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Stars, white dwarf ; Effective temperatures
Keywords: catalogues - stars: magnetic field - subdwarfs; white dwarfs
Abstract:
We report the discovery of 6576 new spectroscopically confirmed white
dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release
12. We obtain Teff, logg and mass for hydrogen atmosphere white dwarf
stars (DAs) and helium atmosphere white dwarf stars (DBs), estimate
the calcium/helium abundances for the white dwarf stars with metallic
lines (DZs) and carbon/helium for carbon-dominated spectra (DQs). We
found one central star of a planetary nebula, one ultracompact helium
binary (AM CVn), one oxygen line-dominated white dwarf, 15 hot
DO/PG1159s, 12 new cataclysmic variables, 36 magnetic white dwarf
stars, 54 DQs, 115 helium-dominated white dwarfs, 148 white dwarf +
main-sequence star binaries, 236 metal-polluted white dwarfs, 300
continuum spectra DCs, 230 hot subdwarfs, 2936 new hydrogen-dominated
white dwarf stars, and 2675 cool hydrogen-dominated subdwarf stars. We
calculate the mass distribution of all 5883 DAs with S/N≥15 in DR12,
including the ones in DR7 and DR10, with an average S/N=26, corrected
to the 3D convection scale, and also the distribution after correcting
for the observed volume, using 1/Vmax.
Description:
Our selection of white dwarf candidates among DR12 objects was similar
to that reported for DR10 (Kepler et al., 2015, Cat.
J/MNRAS/446/4078). We did not restrict our sample by magnitude, but by
S/N≥3. In addition to the 762 targeted white dwarf candidates after
DR10 by anc 42, we selected the spectra of any object classified by
the elodie pipeline (Bolton et al., 2012AJ....144..144B 2012AJ....144..144B) as a white
dwarf, which returned 35708 spectra, an O, B or A star, which returned
another 144471 spectra. Our general colour selection from Kleinman et
al. (2013, Cat. J/ApJS/204/5), which takes into account that SDSS
multicolour imaging separates hot white dwarf and subdwarf stars from
the bulk of the stellar and quasar loci in colour-colour space
(Harris et al., 2003, Cat. J/AJ/126/1023), returned 68836 new spectra,
from which we identified another 2092 white dwarfs, 79 subdwarfs, 36
cataclysmic variables (CVs), and 3 PG 1159. Most of these spectra were
overlapping with the elodie selections.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table6.dat 224 6647 New white dwarf stars
table7.dat 366 409 New classification of known white dwarf stars
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See also:
J/MNRAS/446/4078 : New white dwarf stars in SDSS DR10 (Kepler+, 2015)
Byte-by-byte Description of file: table6.dat table7.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- PMF SDSS Plate-MJD-Fiber
17- 35 A19 --- SDSS SDSS object name (HHMMSS.ss+DDMMSS.s)
37- 38 I2 --- S/N SDSS g-band signal-to-noise ratio
40- 45 F6.3 mag umag SDSS u-band PSF magnitude
47- 51 F5.3 mag e_umag rms uncertainty on umag
53- 58 F6.3 mag gmag SDSS g-band PSF magnitude
60- 64 F5.3 mag e_gmag rms uncertainty on gmag
66- 71 F6.3 mag rmag SDSS r-band PSF magnitude
73- 78 F6.3 mag e_rmag rms uncertainty on rmag
80- 85 F6.3 mag imag SDSS i-band PSF magnitude
87- 91 F5.3 mag e_imag rms uncertainty on imag
93- 98 F6.3 mag zmag SDSS z-band PSF magnitude
100-104 F5.3 mag e_zmag rms uncertainty on zmag
106-110 F5.3 mag E(B-V) Colour excess
112-118 F7.3 mas/yr pm USNO proper motion
120-124 F5.1 deg GLON Galactic longitude
126-130 F5.1 deg GLAT Galactic latitude
132-140 A9 --- SpType Human classification
(: for uncertain classification)
141-146 I6 K Teff ? Effective temperature
148-152 I5 K e_Teff ? rms uncertainty on Teff
154-158 F5.3 [cm/s2] logg ? Surface gravity
160-164 F5.3 [cm/s2] e_logg ? rms uncertainty on logg (1)
166-170 I5 K Teff(3D) ? Teff for pure DAs and DBs
172-176 I5 K e_Teff(3D) ? rms uncertainty on Teff(3D)
178-183 F6.3 [cm/s2] logg(3D) ? Surface gravity for pure DAs and DBs (2)
185-189 F5.3 [cm/s2] e_logg(3D) ? rms uncertainty on logg(3D)
191-197 F7.5 Msun Mass ? Calculated mass, corrected to 3D convection
199-205 F7.5 Msun e_Mass ? rms uncertainty on Mass
207-366 A160 --- Com Comments (3)
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Note (1): Where e_logg=0/000, we have assumed logg=8.0, not fitted the
surface gravity.
Note (2): The temperatures and surface gravities are corrected to the 3D
convection models of Tremblay et al. (2013A&A...559A.104T 2013A&A...559A.104T).
Note (3): The Ca/He for DZs and C/He abundances for DQs, calculated assuming
logg=8.0, are indicated by -log(Ca/He) or -log(C/He).
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History:
* 17-Oct-2016: From electronic version of the journal
* 07-Jun-2017: table7 added, from author (Oliveira Kepler)
(End) Patricia Vannier [CDS] 29-Jul-2016