J/MNRAS/433/3398 White dwarf main-sequence binaries (Rebassa-Mansergas+, 2013)
White dwarf main-sequence binaries from SDSS DR8: unveiling the cool white
dwarf population.
Rebassa-Mansergas A., Agurto-Gangas C., Schreiber M.R., Gansicke B.T.,
Koester D.
<Mon. Not. R. Astron. Soc., 433, 3398-3410 (2013)>
=2013MNRAS.433.3398R 2013MNRAS.433.3398R
ADC_Keywords: Stars, double and multiple ; Binaries, spectroscopic ;
Stars, dwarfs ; Stars, white dwarf ; Photometry
Keywords: binaries: close - binaries: spectroscopic - stars: low-mass -
white dwarfs
Abstract:
The spectroscopic catalogue of white dwarf main-sequence (WDMS)
binaries from the Sloan Digital Sky Survey (SDSS) is the largest and
most homogeneous sample of compact binary stars currently known.
However, because of selection effects, the current sample is strongly
biased against systems containing cool white dwarfs and/or early-type
companions, which are predicted to dominate the intrinsic population.
In this study, we present colour selection criteria that combines
optical (ugriz DR8 SDSS) plus infrared (yjhk DR9 UKIRT Infrared Sky
Survey, JHK Two Micron All Sky Survey and/or W1W2 Wide-Field Infrared
Survey Explorer) magnitudes to select 3419 photometric candidates of
harbouring cool white dwarfs and/or dominant (M dwarf) companions. We
demonstrate that 84 percent of our selected candidates are very likely
genuine WDMS binaries, and that the white dwarf effective temperatures
and secondary star spectral types of 71 percent of our selected
sources are expected to be below ≲10000-15000K, and concentrated at
∼M2-3, respectively. We also present an updated version of the
spectroscopic SDSS WDMS binary catalogue, which incorporates 47 new
systems from SDSS DR8. The bulk of the DR8 spectroscopy is made up
of main-sequence stars and red giants that were targeted as part of
the Sloan Extension for Galactic Understanding and Exploration (SEGUE)
Survey, therefore the number of new spectroscopic WDMS binaries in DR
8 is very small compared to previous SDSS data releases. Despite their
low number, DR8 WDMS binaries are found to be dominated by systems
containing cool white dwarfs and therefore represent an important
addition to the spectroscopic sample. The updated SDSS DR8
spectroscopic catalogue of WDMS binaries consists of 2316 systems. We
compare our updated catalogue with recently published lists of WDMS
binaries and conclude that it currently represents the largest, most
homogeneous and cleanest sample of spectroscopic WDMS binaries from
SDSS.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 177 3419 Object names, coordinates and SDSS ugriz,
UKIDSS YJHK, 2MASS JHK and WISE W1W2 magnitudes of
the 3419 photometrically selected WDMS binaries
table5.dat 39 45 *List of 45 DR7 WDMS binary spectra not included
in the SDSS-DR7 WDMS binary catalogue by
Rebassa-Mansergas et al. (2012MNRAS.419..806R 2012MNRAS.419..806R)
tablea1.dat 37 28 *Systems not considered as WDMS binaries in
Liu et al. (2012, J/MNRAS/424/1841)
tablea2.dat 47 80 *Systems not considered as WDMS binaries in
Morgan et al. (2012AJ....144...93M 2012AJ....144...93M)
tablea3.dat 46 196 *Systems not considered as WDMS binaries in
Wei et al. (2013MNRAS.431.1800W 2013MNRAS.431.1800W)
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Note on table5.dat: These spectra were taken during observations performed
for SDSS-DR7, however, made only publicly available within DR8.
Note on tablea1.dat tablea2.dat tablea3.dat: systems not considered WDMS
binaries in the cited list due to morphological problems in their SDSS images
and/or by visual inspection of the SDSS spectra.
We provide here a revised classification for these systems.
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See also:
J/MNRAS/382/1377 : SDSS WD main-sequence binaries (Rebassa-Mansergas+, 2007)
J/MNRAS/424/1841 : SDSS-UKIDSS white dwarf-main sequence binaries (Liu+, 2012)
http://www.sdss-wdms.org : SDSS WDMS binary catalogue Home Page
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [SDSS]
5- 23 A19 --- SDSS SDSS name (JHHMMSS.ss+DDMMSS.s)
25- 33 F9.5 deg RAdeg Right ascension (J2000)
35- 43 F9.5 deg DEdeg Declination (J2000)
45- 52 F8.5 mag umag SDSS u magnitude
54- 61 F8.5 mag gmag SDSS g magnitude
63- 70 F8.5 mag rmag SDSS r magnitude
72- 79 F8.5 mag imag SDSS i magnitude
81- 88 F8.5 mag zmag SDSS z magnitude
90- 97 F8.5 mag Ymag ?=0 UKIDSS Y magnitude
99-106 F8.5 mag Jmag ?=0 UKIDSS J magnitude
108-115 F8.5 mag Hmag ?=0 UKIDSS H magnitude
117-124 F8.5 mag Kmag ?=0 UKIDSS K magnitude
126-133 F8.5 mag Jmag2 ?=0 2MASS J magnitude
135-142 F8.5 mag Hmag2 ?=0 2MASS H magnitude
144-151 F8.5 mag Kmag2 ?=0 2MASS Ks magnitude
153-160 F8.5 mag W1mag ?=0 WISE W1 magnitude (3.35um)
162-169 F8.5 mag W2mag ?=0 WISE W2 magnitude (4.6um)
171-177 A7 --- SpType Spectral type of source (1)
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Note (1): for sources with available spectroscopy, with the following classes:
WDMS = binary White Dwarf and Main-Sequence star (468)
CV = cataclysmic variable (binary) (21)
MS = Main-Sequence star (16)
MS+MS = superposition of 2 Main-Sequence stars (2)
QSO = quasar (extragalactic) (46)
MS_ext = Main-Sequence star heavily affected by extinction (2)
unknown = unclassifiable (12)
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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- 4 A4 --- --- [SDSS]
5- 23 A19 --- SDSS SDSS name (JHHMMSS.ss+DDMMSS.s)
25- 28 I4 --- Plate SDSS Plate number
30- 34 I5 d MJD SDSS MJD
36- 38 I3 --- Fib SDSS Fiber number
39 A1 --- n_SDSS [*] Note on SDSSJ161239.06+455132.3 (1)
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Note (1): For SDSSJ161239.06+455132.3, the original Plate-MJD-Fiber was
814-5235-403, modified into 814-52370-403 as in Rebassa-Mansergas et al.,
2007MNRAS.382.1377R 2007MNRAS.382.1377R, Cat. J/MNRAS/382/1377
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Byte-by-byte Description of file: tablea1.dat tablea2.dat tablea3.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [SDSS]
5- 23 A19 --- SDSS SDSS name (JHHMMSS.ss+DDMMSS.s)
25- 47 A23 --- Class Revised classification ("sup." stands for
"superposition", "back" for "background source",
"CV" for "Cataclysmic Variable"
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 18-Jul-2014