J/MNRAS/452/765 White dwarf candidates using LAMOST DR3 (Gentile Fusillo+, 2015)
An independent test of the photometric selection of white dwarf candidates
using LAMOST DR3.
Gentile Fusillo N.P., Rebassa-Mansergas A., Gansicke B.T., Liu X.-W.,
Ren J.J., Koester D., Zhan Y., Hou Y., Wang Y., Yang M.
<Mon. Not. R. Astron. Soc., 452, 765-773 (2015)>
=2015MNRAS.452..765G 2015MNRAS.452..765G (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Stars, white dwarf ; Photometry, SDSS ; Stars, masses
Keywords: catalogues - surveys - white dwarfs
Abstract:
In previous work by Gentile Fusillo et al., we developed a selection
method for white dwarf candidates which makes use of photometry,
colours and proper motions to calculate a probability of being a white
dwarf (PWD). The application of our method to the Sloan Digital Sky
Survey (SDSS) data release 10 resulted in ≃ 66000 photometrically
selected objects with a derived PWD, approximately ≃21000 of which
are high-confidence white dwarf candidates. Here, we present an
independent test of our selection method based on a sample of
spectroscopically confirmed white dwarfs from the Large Sky Area
Multi-Fiber Spectroscopic Telescope (LAMOST) survey. We do this by
cross-matching all our ≃66000 SDSS photometric white dwarf candidates
with the over 4 million spectra available in the third data release of
LAMOST. This results in 1673 white dwarf candidates with no previous
SDSS spectroscopy, but with available LAMOST spectra. Among these
objects, we identify 309 genuine white dwarfs. We find that our PWD
can efficiently discriminate between confirmed LAMOST white dwarfs and
contaminants. Our white dwarf candidate selection method can be
applied to any multiband photometric survey and in this work we
conclusively confirm its reliability in selecting white dwarfs without
recourse to spectroscopy. We also discuss the spectroscopic
completeness of white dwarfs in LAMOST, as well as deriving effective
temperatures, surface gravities and masses for the hydrogen-rich
atmosphere white dwarfs in the newly identified LAMOST sample.
Description:
We cross-matched all 65768 objects from the Gentile Fusillo et al.
(2015, Cat. J/MNRAS/448/2260) catalogue with the list of the 4.6
million LAMOST spectra and retrieved 6101 spectra corresponding to
5173 unique objects. Thirty-five hundred of these have also received
SDSS spectroscopic follow-up and 64 further objects had already been
identified on the base of their LAMOST spectra as white dwarfs or
white dwarf binaries by Zhang et al. (2013, Cat. J/AJ/146/34), Zhao et
al. (2013AJ....145..169Z 2013AJ....145..169Z), Ren et al. (2014, Cat. J/A+A/570/A107) and
Rebassa-Mansergas et al. (2015MNRAS.450..743R 2015MNRAS.450..743R).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 339 2040 SDSS WD candidates with LAMOST spectra catalog
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See also:
V/146 : LAMOS DR1 catalogs (Luo+, 2015)
J/MNRAS/448/2260 : White dwarf candidates in SDSS DR10 (Gentile+, 2015)
J/MNRAS/446/4078 : New white dwarf stars in SDSS DR10 (Kepler+, 2015)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [SDSS]
5- 23 A19 --- SDSS SDSS objects name (JHHMMSS.ss+DDMMSS.s)
25- 34 F10.6 deg RAdeg Right ascension (J2000)
36- 44 F9.6 deg DEdeg Declination (J2000)
46- 53 E8.4 --- Prob The probability of being a WD computed for
this object in this paper
55- 62 F8.5 mag umag SDSS u band PSF magnitude
64- 74 F11.9 mag e_umag SDSS u band PSF magnitude uncertainty
76- 83 F8.5 mag gmag SDSS g band PSF magnitude
85- 92 E8.6 mag e_gmag SDSS g band PSF magnitude uncertainty
94-101 F8.5 mag rmag SDSS r band PSF magnitude
103-113 E11.9 mag e_rmag SDSS r band PSF magnitude uncertainty
115-122 F8.5 mag imag SDSS i band PSF magnitude
124-134 E11.9 mag e_imag SDSS i band PSF magnitude uncertainty
136-143 F8.5 mag zmag SDSS z band PSF magnitude
145-155 F11.9 mag e_zmag SDSS z band PSF magnitude uncertainty
157-170 F14.9 mas/yr pmRA Proper motion in right ascension
172-180 F9.6 mas/yr e_pmRA Proper motion in right ascension uncertainty
182-195 F14.9 mas/yr pmDE Proper motion in right declination
197-205 F9.6 mas/yr e_pmDE Proper motion in right declination uncertainty
207-247 A41 --- SClass Currently available Simbad classifications
249-288 A40 --- spID Unique LAMOST spectra identifier composed of
MJD (modified Julian date) of the observation,
plate ID, spectrograph ID and a fiber ID
290-305 A16 --- LClass Classification of the object based on our
visual inspection of its LAMOST spectra
307-311 I5 K Teff ?=- Effective temperature calculated for DA
white dwarfs (sect. 6)
313-317 I5 K e_Teff ?=- uncertainty in the effective temperature
calculated for DA white dwarfs (sect. 6)
319-322 F4.2 [cm/s2] logg ?=- Surface gravity calculated for DA white
dwarfs (sect. 6)
324-328 F5.3 [cm/s2] e_logg ?=- uncertainty in the surface gravity
calculated for DA white dwarfs (sect. 6)
330-333 F4.2 Msun Mass ?=- Mass of the white dwarfs calculated for
DA white dwarfs (sect. 6)
335-339 F5.3 Msun e_Mass ?=- uncertainty in mass of the white dwarfs
calculated for DA white dwarfs (sect. 6)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 14-Jan-2016