J/AJ/131/1674 Close binary systems from SDSS DR4 (Silvestri+, 2006)
A catalog of spectroscopically selected close binary systems from the Sloan
Digital Sky Survey data release four.
Silvestri N.M., Hawley S.L., West A.A., Szkody P., Bochanski J.J.,
Eisenstein D.J., McGehee P., Schmidt G.D., Smith J.A., Wolfe M.A.,
Harris H.C., Kleinman S.J., Liebert J., Nitta A., Barentine J.C.,
Brewington H.J., Brinkmann J., Harvanek M., Krzesinski J., Long D.,
Neilsen E.H.Jr, Schneider D.P., Snedden S.A.
<Astron. J., 131, 1674-1686 (2006)>
=2006AJ....131.1674S 2006AJ....131.1674S
ADC_Keywords: Stars, double and multiple ; Stars, white dwarf ; Stars, M-type ;
Stars, dwarfs ; Photometry, SDSS
Keywords: binaries: close - novae, cataclysmic variables - stars: activity -
stars: low-mass, brown dwarfs - white dwarfs
Abstract:
We present a spectroscopic sample of 746 detached close binary systems
from the Sloan Digital Sky Survey (SDSS) Fourth Data Release
(2006ApJS..162...38A 2006ApJS..162...38A). The majority of these binaries consist of a
white dwarf primary and a low-mass secondary (typically M dwarf)
companion. We have determined the temperature and gravity for 496 of
the white dwarf primaries and the spectral type and magnetic activity
properties for 661 of the low-mass secondaries. We have estimated the
distances for each of the white dwarf-main-sequence star binaries and
use white dwarf evolutionary grids to establish the age of each binary
system from the white dwarf cooling times.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 160 746 SDSS white dwarf + main sequence star (WDM) binaries
table4.dat 86 746 White dwarf parameters
table5.dat 173 746 M dwarf parameters
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See also:
http:www.sdss.org : SDSS Home Page
III/70 : Luyten's White Dwarf Catalogues (Luyten, 1970-77)
J/ApJ/607/426 : Catalog of white dwarfs in SDSS-DR1 (Kleinman+, 2004)
J/AJ/126/1023 : White Dwarfs in the SDSS (Harris+, 2003)
J/AJ/131/582 : Cool white dwarfs in the SDSS (Kilic+, 2006)
J/AJ/124/1118 : Radial velocities of high-velocity white dwarfs
(Silvestri+, 2002)
J/AJ/129/2428 : M dwarf-white dwarf binary systems (Silvestri+, 2005)
J/ApJ/586/1356 : White dwarfs with cool companions (Wachter+, 2003)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- SDSS Source name (SDSS JHHMMSS.ss+DDMMSS.s)
21- 24 I4 --- plate ? SDSS plate number
26- 28 I3 --- fiber ? SDSS fiber number
30- 34 I5 d MJD ? Modified Julian Date of observation
36- 44 A9 --- SpType Spectral type of the primary and secondary (G1)
46- 54 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000.0)
56- 65 F10.5 deg DEdeg Declination in decimal degrees (J2000.0)
67- 71 F5.2 mag umag ? SDSS u band psf magnitude
73- 76 F4.2 mag e_umag ? The 1σ error in umag
78- 81 F4.2 mag Au ? Galactic extinction in the SDSS u band
83- 87 F5.2 mag gmag ? SDSS g band psf magnitude
89- 92 F4.2 mag e_gmag ? The 1σ error in gmag
94- 97 F4.2 mag Ag ? Galactic extinction in the SDSS g band
99-103 F5.2 mag rmag ? SDSS r band psf magnitude
105-108 F4.2 mag e_rmag ? The 1σ error in rmag
110-113 F4.2 mag Ar ? Galactic extinction in the SDSS r band
115-119 F5.2 mag imag ? SDSS i band psf magnitude
121-125 F5.2 mag e_imag ?=99.99 The 1σ error in imag
127-130 F4.2 mag Ai ? Galactic extinction in the SDSS i band
132-136 F5.2 mag zmag ? SDSS z band psf magnitude
138-142 F5.2 mag e_zmag ? The 1σ error in zmag
144-147 F4.2 mag Az ? Galactic extinction in the SDSS z band
149-157 A9 --- DR Original data release (1)
159-160 A2 --- Note [**] Potential low gravity (log(g)<7) white
dwarfs
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Note (1): Numbers in parenthesis are plate numbers for the object's
original data release. R is for data originally published in Raymond
et al. (2003AJ....125.2621R 2003AJ....125.2621R); K is for data originally published in
Kleinman et al. (2004, Cat. J/ApJ/607/426).
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- SDSS Source name (SDSS JHHMMSS.ss+DDMMSS.s)
21- 24 I4 --- plate ? SDSS plate number
26- 28 I3 --- fiber ? SDSS fiber number
30- 34 I5 --- MJD ? Modified Julian Date of observation
36- 44 A9 --- SpType Spectral type of the primary and
secondary (G1)
46- 48 F3.1 --- WDType ? White dwarf model sub-type (G2)
50- 52 F3.1 --- e_WDType ? The 1σ error in WDType
54- 56 A3 --- MSType Main sequence spectral sub-type
58- 60 F3.1 [cm/s2] log(g) ? Log of the model surface gravity of WD
62- 65 F4.2 [cm/s2] e_log(g) ? The 1σ error in log(g)
67- 71 I5 K Teff ? Model effective temperature of WD
73- 77 I5 K e_Teff ? The 1σ error in Teff
79- 86 E8.2 yr Age ? Cooling age from evolutionary model
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- SDSS Source name (SDSS JHHMMSS.ss+DDMMSS.s)
21- 24 I4 --- plate ? SDSS plate number
26- 28 I3 --- fiber ? SDSS fiber number
30- 34 I5 d MJD ? Modified Julian Date of observation
36- 44 A9 --- SpType Spectral type of primary + secondary (G1)
46- 48 F3.1 --- WDType ? White dwarf sub-type (G2)
50- 52 A3 --- MSType Main sequence spectral M sub-type
54- 59 F6.2 0.1nm EW(Ha) ? Hα equivalent width of dM star
61- 66 F6.2 0.1nm e_EW(Ha) ? The 1σ error in EW(Ha)
68- 71 F4.2 --- TiO5 ? TiO5 molecular bandhead measurement
73- 76 F4.2 --- e_TiO5 ? The 1σ error in TiO5
78- 81 F4.2 --- CaH1 ? CaH1 molecular bandhead measurement
83- 87 F5.2 --- e_CaH1 ? The 1σ error in CaH1
89- 92 F4.2 --- CaH2 ? CaH2 molecular bandhead measurement
94- 97 F4.2 --- e_CaH2 ? The 1σ error in CaH2
99-102 F4.2 --- CaH3 ? CaH3 molecular bandhead measurement
104-107 F4.2 --- e_CaH3 ? The 1σ error in CaH3
109-112 F4.2 --- TiO8 ? TiO8 molecular bandhead measurement
114-117 F4.2 --- e_TiO8 ? The 1σ error in TiO8
119-124 F6.2 0.1nm C-Ha ? Continuum Hα in Angstroms
126-129 F4.2 0.1nm e_C-Ha ? The 1σ error in C-Ha
131-134 F4.2 --- r-i ? SDSS (r-i) color index
136-140 F5.2 --- logchi ? The log(χ) factor (West, Walkowicz
& Hawley 2005PASP..117..706W 2005PASP..117..706W) (1)
142-149 E8.2 --- LHa/Lbol ? The Hα luminosity relative
to the bolometric luminosity
151-155 F5.2 [-] log(LHa/Lbol) ? The log of LHa/Lbol
157-158 A2 --- MSb [**] MSType is a lower limit (2)
160-173 A14 --- Com Comment
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Note (1): χ is the ratio of the flux in the continuum near Hα to
the bolometric flux. This factor varies with the spectral type.
Note (2): The white dwarf could not be subtracted, resulting in earlier
(bluer) spectral type identification.
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Global Notes:
Note (G1): In the by-eye classification of the object, a spectral type followed
by a colon indicates uncertainty and by a "e" indicates emission.
Note (G2): Subtype defined by WDType=50400/Teff, from Sion et al.
(1983ApJ...269..253S 1983ApJ...269..253S).
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History:
* 14-Feb-2007: From electronic version of the journal
* 13-Sep-2007: In tables 1, 4 and 5, the name SDSS J073126.67+059311.9
was corrected into SDSS J081126.67+053911.8.
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 14-Feb-2007