J/ApJ/607/426 Catalog of white dwarfs in SDSS-DR1 (Kleinman+, 2004)
A catalog of spectroscopically identified white dwarf stars in the
First Data Release of the Sloan Digital Sky Survey.
Kleinman S.J., Harris H.C., Eisenstein D.J., Liebert J., Nitta A.,
Krzesinski J., Munn J.A., Dahn C.C., Hawley S.L., Pier J.R., Schmidt G.,
Silvestri N.M., Smith J.A., Szkody P., Strauss M.A., Knapp G.R.,
Collinge M.J., Mukadam A.S., Koester D., Uomoto A., Schlegel D.J.,
Anderson S.F., Brinkmann J., Lamb D.Q., Schneider D.P., York D.G.
<Astrophys. J., 607, 426-444 (2004)>
=2004ApJ...607..426K 2004ApJ...607..426K
ADC_Keywords: Stars, white dwarf ; Photometry, SDSS ; Proper motions
Keywords: catalogs - subdwarfs - white dwarfs
Abstract:
We present the full spectroscopic white dwarf and hot subdwarf sample
from the Sloan Digital Sky Survey (SDSS) First Data Release, DR1.
We find 2551 white dwarf stars of various types, 240
hot subdwarf stars, and an additional 144 objects we have identified
as uncertain white dwarf stars. Of the white dwarf stars, 1888 are
nonmagnetic DA types and 171 are nonmagnetic DBs. The remaining (492)
objects consist of all different types of white dwarf stars: DO, DQ,
DC, DH, DZ, hybrid stars such as DAB, etc., and those with
nondegenerate companions. We fit the DA and DB spectra with a grid of
models to determine the Teff and logg for each object. For all
objects, we provide coordinates, proper motions, SDSS photometric
magnitudes, and enough information to retrieve the spectrum/image from
the SDSS public database. This catalog nearly doubles the known sample
of spectroscopically identified white dwarf stars. In the DR1 imaged
area of the sky, we increase the known sample of white dwarf stars by
a factor of 8.5. We also comment on several particularly interesting
objects in this sample.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 188 1888 SDSS DR1 spectroscopically identified DA stars
table4.dat 189 171 SDSS DR1 spectroscopically identified DB stars
table5.dat 175 2791 All SDSS DR1 spectroscopically identified white dwarf
and subdwarf stars
table6.dat 168 144 All SDSS DR1 spectroscopically identified white dwarf
and subdwarf stars with uncertain identifications
table11.dat 61 109 Previously known white dwarf stars recovered in
this work
table12.dat 115 218 Previously known white dwarf stars not
spectroscopically recovered in this work
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See also:
III/235 : Spectroscopically Identified White Dwarfs (McCook+, 2003)
J/ApJS/167/40 : SDSS4 confirmed white dwarfs catalog (Eisenstein+, 2006)
J/AJ/126/1023 : White Dwarfs in the SDSS (Harris+, 2003)
http://www.sdss.org/dr1 : SDSS DR1 Home Page
Byte-by-byte Description of file: table3.dat table4.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [SDSS]
6- 24 A19 --- SDSS Object name (G1)
26- 29 I4 --- Plate Plate number
31- 35 I5 d ObsDate MJD (JD-2400000.5) date of observation
37- 39 I3 --- Fiber Fiber number
41- 49 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000)
51- 59 F9.5 deg DEdeg Declination in decimal degrees (J2000)
61 A1 --- f_umag [*] Indicates a questionable pipeline
reduction in umag
62- 66 F5.2 mag umag SDSS PSF u band magnitude
68- 71 F4.2 mag e_umag Uncertainty in umag
73 A1 --- f_gmag [*] Indicates a questionable pipeline
reduction in gmag
74- 78 F5.2 mag gmag SDSS PSF g band magnitude
80- 83 F4.2 mag e_gmag Uncertainty in gmag
85 A1 --- f_rmag [*] Indicates a questionable pipeline
reduction in rmag
86- 90 F5.2 mag rmag SDSS PSF r band magnitude
92- 95 F4.2 mag e_rmag Uncertainty in rmag
97 A1 --- f_imag [*] Indicates a questionable pipeline
reduction in imag
98-102 F5.2 mag imag SDSS PSF i band magnitude
104-107 F4.2 mag e_imag Uncertainty in imag
109 A1 --- f_zmag [*] Indicates a questionable pipeline
reduction in zmag
110-114 F5.2 mag zmag SDSS PSF z band magnitude
116-119 F4.2 mag e_zmag Uncertainty in zmag
121-125 F5.2 --- S/N Final median S/N squared per pixel (2)
127-130 I4 mas/yr pmRA ? Proper motion in Right Ascension (3)
132-135 I4 mas/yr pmDE ? Proper motion in Declination (3)
137-141 F5.3 mag Ag The g band extinction
143-147 I5 K Teff Model determined effective temperature
149-153 I5 K e_Teff Uncertainty in Teff
155-158 F4.2 [cm/s2] log(g) Log of the model determined surface gravity
160-163 F4.2 [cm/s2] e_log(g) Uncertainty in log(g)
165-168 F4.2 --- Chi2 The χ2 fit
170-183 A14 --- AutoID The ASCII identification (4)
185-187 A3 --- Notes Additional notes (G2)
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Note (2): Of the spectrum from the DR1 best database.
Note (3): NULL value indicates N/A.
Note (4): The format is simply DA or DB followed by the Teff subtype
(50400K/Teff) and the log(g)s, separated by an underscore.
The CH: prefix and colon suffix are quality assessment checks which
are discussed in Section 5. Where our check on the auto fitting deemed
the fit invalid, we replace the fit parameters with zeroes and the fit
AutoID with N/A.
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Byte-by-byte Description of file: table5.dat table6.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [SDSS]
6- 24 A19 --- SDSS Object name (G1)
26- 29 I4 --- Plate Plate number
31- 35 I5 d ObsDate MJD (JD-2400000.5) date of observation
37- 39 I3 --- Fiber Fiber number
41- 49 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000)
51- 59 F9.5 deg DEdeg Declination in decimal degrees (J2000)
61- 67 F7.2 yr Epoch Epoch of the observation
69 A1 --- f_umag [*] Indicates a questionable pipeline
reduction in umag
70- 74 F5.2 mag umag SDSS PSF u band magnitude
76- 79 F4.2 mag e_umag Uncertainty in umag
81 A1 --- f_gmag [*] Indicates a questionable pipeline
reduction in gmag
82- 86 F5.2 mag gmag SDSS PSF g band magnitude
88- 91 F4.2 mag e_gmag Uncertainty in gmag
93 A1 --- f_rmag [*] Indicates a questionable pipeline
reduction in rmag
94- 98 F5.2 mag rmag SDSS PSF r band magnitude
100-103 F4.2 mag e_rmag Uncertainty in rmag
105 A1 --- f_imag [*] Indicates a questionable pipeline
reduction in imag
106-110 F5.2 mag imag SDSS PSF i band magnitude
112-115 F4.2 mag e_imag Uncertainty in imag
117 A1 --- f_zmag [*] Indicates a questionable pipeline
reduction in zmag
118-122 F5.2 mag zmag SDSS PSF z band magnitude
124-127 F4.2 mag e_zmag Uncertainty in zmag
129-133 F5.2 --- S/N Final median S/N squared per pixel (2)
135-138 I4 mas/yr pmRA ? Proper motion in Right Ascension (3)
140-143 I4 mas/yr pmDE ? Proper motion in Declination (3)
145-149 F5.3 mag Ag The g band extinction
151-166 A16 --- ID The human identification of spectral type
168-170 A3 --- Notes Additional notes (G2)
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Note (2): Of the spectrum from the DR1 best database.
Note (3): NULL value indicates N/A.
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Byte-by-byte Description of file: table11.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [SDSS]
6- 24 A19 --- SDSS Object name (G1)
26- 30 F5.2 mag gmag SDSS PSF g band magnitude
32- 37 A6 --- SType SDSS type
39- 50 A12 --- OName Other name
52- 58 A7 --- OType Other type
60 A1 --- Note Additional notes (2)
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Note (2): Additional notes as follows:
1 = SDSS position different from previous by more than 10 arcsec.
2 = Unpublished white dwarf, in Hamburg Quasar Survey
(Homeier 2002, priv. comm.)
3 = White dwarf discovered in the SDSS EDR
(Gansicke et al., 2002A&A...394..957G 2002A&A...394..957G)
4 = White dwarf discovered in the SDSS
(Harris et al., 2001ApJ...549L.109H 2001ApJ...549L.109H)
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Byte-by-byte Description of file: table12.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [WD]
3- 12 A10 --- WD Object name from WD catalog (III/235)
14- 19 A6 --- Type Object type
21- 25 F5.2 mag mag ? Observed magnitude
27 A1 --- Filt Filter used to obtain mag
29- 30 I2 h RAh ? Hour of Right Ascension (J2000)
32- 33 I2 min RAm ? Minute of Right Ascension (J2000)
35- 39 F5.2 s RAs ? Second of Right Ascension (J2000)
41 A1 --- DE- Sign of the Declination (J2000)
42- 43 I2 deg DEd ? Degree of Declination (J2000)
45- 46 I2 arcmin DEm ? Arcminute of Declination (J2000)
48- 51 F4.1 arcsec DEs ? Arcsecond of Declination (J2000)
53 A1 --- f_umag [*] Indicates saturated pixels in umag
54- 58 F5.2 mag umag ? SDSS PSF u band magnitude
60- 63 F4.2 mag e_umag ? Uncertainty in umag
65 A1 --- f_gmag [*] Indicates saturated pixels in gmag
66- 70 F5.2 mag gmag ? SDSS PSF g band magnitude
72- 75 F4.2 mag e_gmag ? Uncertainty in gmag
77 A1 --- f_rmag [*] Indicates saturated pixels in rmag
78- 82 F5.2 mag rmag ? SDSS PSF r band magnitude
84- 87 F4.2 mag e_rmag ? Uncertainty in rmag
89 A1 --- f_imag [*] Indicates saturated pixels in imag
90- 94 F5.2 mag imag ? SDSS PSF i band magnitude
96- 99 F4.2 mag e_imag ? Uncertainty in imag
101 A1 --- f_zmag [*] Indicates saturated pixels in zmag
102-106 F5.2 mag zmag ? SDSS PSF z band magnitude
108-111 F4.2 mag e_zmag ? Uncertainty in zmag
113-114 A2 --- Note Additional note (1)
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Note (1): Additional notes as follows:
1 = No white dwarf found near this position.
2 = SDSS spectrum 0410-51816-565 shows WD0255+009.1 is a QSO.
3 = No SDSS imaging data, too near bright star.
4 = Probably same star as WD0330-009.
5 = WD0820+021 probably not detected, too faint.
6 = Spectrum not in DR1, but is given in
Initial Survey paper (Harris et al., 2003, Cat. J/AJ/126/1023).
7 = Falls in small gap in SDSS imaging data.
8 = Unresolved with WD1330+015.1.
9 = The colors of WD1401+005 are red and indicate it is not a
white dwarf.
10 = Probably same star as WD1422+028.
11 = Colors are very red and indicate WD1449+003 is not a white dwarf.
12 = Colors indicate WD1451--004, WD1455+019, and WD1500+006 are
horizontal-branch stars, not white dwarf stars.
13 = Probably same star as WD1544+009.
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Global notes:
Note (G1): The format of the name is SDSS JHHMMSS.ss+DDMMSS.s where the
HHMMSS.ss is the truncated (not rounded) hours (HH), minutes (MM), and
seconds (SS.ss) from the SDSS J2000 right ascension and the +DDMMSS.s
is the truncated declination in degrees, minutes, and seconds.
Note (G2): Additional notes as follows:
1 = Computer fit checked and found to be a reasonable fit.
2 = Computer fit checked and found not to be a believable fit.
3 = The computer fit may be affected by a late-type companion.
4 = This particular object is described further in the section of the
paper "Interesting Objects".
5 = This object had no "best" photometry in the DR1 database, so the
ugriz magnitudes come from the "target" photometry. (The lack
of "best" photometry is probably due to the object being on the
edge of the DR1 survey limits.)
6 = This DB spectrum also shows signs of Hydrogen.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 06-Jul-2004