J/MNRAS/417/1210 DA-white dwarfs from SDSS and UKIDSS (Girven+, 2011)
DA white dwarfs in Sloan Digital Sky Survey Data Release 7 and a search for
infrared excess emission.
Girven J., Gansicke B.T., Steeghs D., Koester D.
<Mon. Not. R. Astron. Soc., 417, 1210-1235 (2011)>
=2011MNRAS.417.1210G 2011MNRAS.417.1210G
ADC_Keywords: Stars, white dwarf ; Infrared sources ;
Stars, late-type ; Photometry, SDSS ; Photometry, infrared
Keywords: brown dwarfs - circumstellar matter - stars: low-mass - white dwarfs -
infrared: stars
Abstract:
We present a method which uses colour-colour cuts on the Sloan
Digital Sky Survey (SDSS) photometry to select white dwarfs with
hydrogen-rich (DA) atmospheres without the recourse to spectroscopy.
This method results in a sample of DA white dwarfs that is 95 per cent
complete at an efficiency of returning a true DA white dwarf of 62 per
cent. The approach was applied to SDSS Data Release 7 for objects with
and without SDSS spectroscopy.
Description:
These tables show the objects from the spectroscopic and
photometric-only samples in "spec.dat" and "phot.dat" respectively.
The table ire.dat shows all objects classified as having an infrared
excess from its SDSS and UKIDSS spectral energy distribution. Finally
posqso.dat lists the objects believed to be quasars from their SDSS
and UKIDSS spectral energy distribution.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
spec.dat 285 8259 SDSS DR7 spectroscopic white dwarfs
phot.dat 249 16844 SDSS DR7 photometric white dwarfs
ire.dat 461 153 SDSS DR7 & UKIDSS DR8 IR excess candidates
posqso.dat 220 38 SDSS DR7 & UKIDSS DR8 possible QSOs
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See also:
II/294 : SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
III/235 : Spectroscopically Identified White Dwarfs (McCook+, 2008)
J/MNRAS/335/673 : DA white dwarfs in 2dF QSO Redshift Survey (Vennes+, 2002)
J/ApJ/631/1100 : Atmospheric parameters of DA white dwarfs (Gianninas+, 2005)
J/ApJ/652/1554 : Iron in hot DA white dwarfs (Vennes+, 2006)
J/ApJS/167/40 : SDSS-DR4 confirmed white dwarfs catalog (Eisenstein+, 2006)
J/A+A/486/843 : White dwarf-red dwarf binaries in SDSS (Augusteijn+, 2008)
J/AJ/135/1239 : Spectral distances to DA white dwarfs (Holberg+, 2008)
J/MNRAS/402/620 : SDSS WD main-sequence binaries (Rebassa-Mansergas+, 2010)
http://www.sdss.org : SDSS Home Page
Byte-by-byte Description of file: spec.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [SDSS]
5- 23 A19 --- SDSS The IAU name, JHHMMSS.ss+DDMMSS.s
25- 34 F10.6 deg RAdeg Decimal degree right ascension (J2000)
36- 45 F10.6 deg DEdeg Decimal degree declination (J2000)
47- 50 I4 --- Plate SDSS Plate number
52- 56 I5 d MJD SDSS Modified Julian Date of
spectroscopic observation
58- 60 I3 --- Fiber SDSS Fiber number
62- 72 A11 --- SpClass Spectral Classification (G1)
74- 79 F6.3 mag umag SDSS u-band PSF magnitude
81- 86 F6.3 mag gmag SDSS g-band PSF magnitude
88- 93 F6.3 mag rmag SDSS r-band PSF magnitude
95-100 F6.3 mag imag SDSS i-band PSF magnitude
102-107 F6.3 mag zmag SDSS z-band PSF magnitude
109-114 F6.3 mag e_umag Error in umag
116-121 F6.3 mag e_gmag Error in gmag
123-128 F6.3 mag e_rmag Error in rmag
130-135 F6.3 mag e_imag Error in imag
137-142 F6.3 mag e_zmag Error in zmag
144-150 F7.3 mag Ymag ?=999 UKIDSS Y-band (1.03um) PSF magnitude
152-158 F7.3 mag Jmag ?=999 UKIDSS J-band (1.25um) PSF magnitude
160-166 F7.3 mag Hmag ?=999 UKIDSS H-band (1.65um) PSF magnitude
168-174 F7.3 mag Kmag ?=999 UKIDSS K-band (2.20um) PSF magnitude
176-182 F7.3 mag e_Ymag ?=999 Error in Ymag
184-190 F7.3 mag e_Jmag ?=999 Error in Jmag
192-198 F7.3 mag e_Hmag ?=999 Error in Hmag
200-206 F7.3 mag e_Kmag ?=999 Error in Kmag
208-215 F8.2 mas/yr pmRA ?=0 Proper motion in right ascension
217-224 F8.2 mas/yr pmDE ?=0 Proper motion in declination
226-233 F8.2 mas/yr e_pmRA ?=0 Error in pmRA
235-242 F8.2 mas/yr e_pmDE ?=0 Error in pmDE
244-249 I6 K Teff ? Spectroscopic fit temperature
251-255 I5 K e_Teff ? Error in Teff
257-260 F4.2 [cm/s2] logg ? Spectroscopic log surface gravity
262-265 F4.2 [cm/s2] e_logg ? Error in logg
267-270 F4.2 Msun Mwd ? Spectroscopic mass of the white dwarf
272-275 F4.2 Msun e_Mwd ? Error in Mwd
277-280 I4 pc Dist ? Spectroscopic distance to the white dwarf
282-285 I4 pc e_Dist ? Error in Dist
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Byte-by-byte Description of file: phot.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [SDSS]
5- 23 A19 --- SDSS The IAU name, JHHMMSS.ss+DDMMSS.s
25- 34 F10.6 deg RAdeg Decimal degree right ascension (J2000)
36- 45 F10.6 deg DEdeg Decimal degree declination (J2000)
47- 52 F6.3 mag umag SDSS u-band PSF magnitude
54- 59 F6.3 mag gmag SDSS g-band PSF magnitude
61- 66 F6.3 mag rmag SDSS r-band PSF magnitude
68- 73 F6.3 mag imag SDSS i-band PSF magnitude
75- 80 F6.3 mag zmag SDSS z-band PSF magnitude
82- 87 F6.3 mag e_umag Error in umag
89- 94 F6.3 mag e_gmag Error in gmag
96-101 F6.3 mag e_rmag Error in rmag
103-108 F6.3 mag e_imag Error in imag
110-115 F6.3 mag e_zmag Error in zmag
117-123 F7.3 mag Ymag ?=999 UKIDSS Y-band (1.03um) PSF magnitude
125-131 F7.3 mag Jmag ?=999 UKIDSS J-band (1.25um) PSF magnitude
133-139 F7.3 mag Hmag ?=999 UKIDSS H-band (1.65um) PSF magnitude
141-147 F7.3 mag Kmag ?=999 UKIDSS K-band (2.20um) PSF magnitude
149-155 F7.3 mag e_Ymag ?=999 Error in Ymag
157-163 F7.3 mag e_Jmag ?=999 Error in Jmag
165-171 F7.3 mag e_Hmag ?=999 Error in Hmag
173-179 F7.3 mag e_Kmag ?=999 Error in Kmag
181-188 F8.2 mas/yr pmRA ?=0 Proper motion in right ascension
190-197 F8.2 mas/yr pmDE ?=0 Proper motion in declination
199-206 F8.2 mas/yr e_pmRA ?=0 Error in pmRA
208-215 F8.2 mas/yr e_pmDE ?=0 Error in pmDE
217-222 I6 K Teff Photometric fit temperature
224-228 I5 K e_Teff Lower limit error in Teff
230-234 I5 K E_Teff Upper limit error in Teff
236-239 F4.2 [cm/s2] logg Photometric log surface gravity
241-244 F4.2 [cm/s2] e_logg Lower limit error in logg
246-249 F4.2 [cm/s2] E_logg Upper limit error in logg
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Byte-by-byte Description of file: ire.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name The IAU name, HHMM+DDMM
11- 20 F10.6 deg RAdeg Decimal degree right ascension (J2000)
22- 31 F10.6 deg DEdeg Decimal degree declination (J2000)
33- 36 I4 --- Plate ? SDSS Plate number
38- 42 I5 d MJD ? SDSS Modified Julian Date of
spectroscopic observation
44- 46 I3 --- Fiber ? SDSS Fiber number
48- 53 I6 K Teffs ? Spectroscopic fit temperature
55- 59 I5 K e_Teffs ? Error in Teffs
61- 64 F4.2 [cm/s2] loggs ? Spectroscopic log surface gravity
66- 69 F4.2 [cm/s2] e_loggs ? Error in loggs
71- 74 F4.2 Msun Mwds ? Spectroscopic mass of the white dwarf
76- 79 F4.2 Msun e_Mwds ? Error in Mwds
81- 84 I4 pc Dists ? Spectroscopic distance to the white dwarf
86- 89 I4 pc e_Dists ? Error in Dists
91- 96 I6 K Teffp ? Photometric fit temperature
98-102 I5 K e_Teffp ? Lower limit error in Teffp
104-108 I5 K E_Teffp ? Upper limit error in Teffp
110-113 F4.2 [cm/s2] loggp ? Photometric log surface gravity
115-118 F4.2 [cm/s2] e_loggp ? Lower limit error in logg
120-123 F4.2 [cm/s2] E_loggp ? Upper limit error in logg
125-128 I4 pc Distp ? Photometric distance to the white dwarf
130-132 I3 pc e_Distp ? Lower limit error in Distp
134-136 I3 pc E_Distp ? Upper limit error in Distp
138-142 A5 --- Sp.s Spectroscopic companion type
144-148 A5 --- Sp.p Photometric companion type
150-156 A7 --- Notes [DAire: ] class IR excess white dwarf
158-174 A17 --- Note.s Spectroscopic companion fit notes (2)
176-192 A17 --- Note.p Photometric companion fit notes (2)
194-197 A4 --- clSDSS Classification of SDSS spectrum (G1)
199-205 A7 --- clEIS Classification according to Eisenstein et al.
(2006, Cat. J/ApJS/167/40)
207-230 A24 --- SName Simbad Name
232-245 A14 --- clSim Simbad Classification
247-252 I6 K TeffR ? Temperature according to Rebassa-Mansergas
et al. (2011, Cat. J/MNRAS/402/620)
254-258 I5 K e_TeffR ? Error in TeffR
260-263 F4.2 [cm/s2] loggR ? log surface gravity according to
Rebassa-Mansergas et al.
(2011, Cat. J/MNRAS/402/620)
265-268 F4.2 [cm/s2] e_loggR ? log surface gravity in loggR
270-271 A2 --- Sp.R Companion type according to Rebassa-Mansergas
et al. (2011, Cat. J/MNRAS/402/620)
273-278 F6.3 mag umag SDSS u-band PSF magnitude
280-285 F6.3 mag gmag SDSS g-band PSF magnitude
287-292 F6.3 mag rmag SDSS r-band PSF magnitude
294-299 F6.3 mag imag SDSS i-band PSF magnitude
301-306 F6.3 mag zmag SDSS z-band PSF magnitude
308-313 F6.3 mag e_umag Error in umag
315-320 F6.3 mag e_gmag Error in gmag
322-327 F6.3 mag e_rmag Error in rmag
329-334 F6.3 mag e_imag Error in imag
336-341 F6.3 mag e_zmag Error in zmag
343-349 F7.3 mag Ymag ?=999 UKIDSS Y-band (1.03um) PSF magnitude
351-357 F7.3 mag Jmag ?=999 UKIDSS J-band (1.25um) PSF magnitude
359-365 F7.3 mag Hmag ?=999 UKIDSS H-band (1.65um) PSF magnitude
367-373 F7.3 mag Kmag ?=999 UKIDSS K-band (2.20um) PSF magnitude
375-381 F7.3 mag e_Ymag ?=999 Error in Ymag
383-389 F7.3 mag e_Jmag ?=999 Error in Jmag
391-397 F7.3 mag e_Hmag ?=999 Error in Hmag
399-405 F7.3 mag e_Kmag ?=999 Error in Kmag
407-412 F6.2 mag W1mag ?=999 WISE W1-band (3.35um) PSF magnitude
414-419 F6.2 mag W2mag ?=999 WISE W2-band (4.6um) PSF magnitude
421-426 F6.2 mag W3mag ?=999 WISE W3-band (11.6um) PSF magnitude
428-433 F6.2 mag W4mag ?=999 WISE W4-band (22.1um) PSF magnitude
435-440 F6.2 mag e_W1mag ?=999 Error in W1mag
442-447 F6.2 mag e_W2mag ?=999 Error in W2mag
449-454 F6.2 mag e_W3mag ?=999 Error in W3mag
456-461 F6.2 mag e_W4mag ?=999 Error in W4mag
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Note (2): key to notes:
bf = visually bad fit
bg = background contamination
disc = disc candidate
hotWD = high Teff white dwarf and so the IR excess can disappear with
small changes in e.g. flux calibration
moreIR = more IR data required
resolved = resolved or partially resolved binary
QSO = possible quasar
? = unknown
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Byte-by-byte Description of file: posqso.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [SDSS]
5- 23 A19 --- SDSS The IAU name, JHHMMSS.ss+DDMMSS.s
25- 34 F10.6 deg RAdeg Decimal degree right ascension (J2000)
36- 45 F10.6 deg DEdeg Decimal degree declination (J2000)
47- 71 A25 --- SName Simbad Name
73- 86 A14 --- clSIM Simbad Classification
88- 93 F6.3 mag umag SDSS u-band PSF magnitude
95-100 F6.3 mag gmag SDSS g-band PSF magnitude
102-107 F6.3 mag rmag SDSS r-band PSF magnitude
109-114 F6.3 mag imag SDSS i-band PSF magnitude
116-121 F6.3 mag zmag SDSS z-band PSF magnitude
123-128 F6.3 mag e_umag Error in umag
130-135 F6.3 mag e_gmag Error in gmag
137-142 F6.3 mag e_rmag Error in rmag
144-149 F6.3 mag e_imag Error in imag
151-156 F6.3 mag e_zmag Error in zmag
158-164 F7.3 mag Ymag ?=999 UKIDSS Y-band (1.03um) PSF magnitude
166-172 F7.3 mag Jmag ?=999 UKIDSS J-band (1.25um) PSF magnitude
174-180 F7.3 mag Hmag ?=999 UKIDSS H-band (1.65um) PSF magnitude
182-188 F7.3 mag Kmag UKIDSS K-band (2.20um) PSF magnitude
190-196 F7.3 mag e_Ymag ?=999 Error in Ymag
198-204 F7.3 mag e_Jmag ?=999 Error in Jmag
206-212 F7.3 mag e_Hmag ?=999 Error in Hmag
214-220 F7.3 mag e_Kmag Error in Kmag
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Global Notes:
Note (G1): classes are
* DA: white dwarfs with H lines
* MWD: Miscellaneous White Dwarf (white dwarf not DA)
* NLHS (narrow-line hot stars) includes ultra-low-mass white dwarfs and
very cool DAs, particularly those at low S/N, which can look rather
similar to early-type MS stars, subdwarfs, extreme horizontal branch
stars or very metal poor halo stars.
* WDMS (White Dwarf - Main Sequence binary)
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Acknowledgements:
J. Girven, j.m.girven(at)warwick.ac.uk
(End) Girven, J. [Univ. Warwick], Patricia Vannier [CDS] 16-Feb-2012