J/MNRAS/404/1817 2MASS/SDSS data for 806 ultracool dwarfs (Zhang+, 2010)
Discovery of the first wide L dwarf + giant binary system and eight other
ultracool dwarfs in wide binaries.
Zhang Z.H., Pinfield D.J., Day-Jones A.C., Burningham B., Jones H.R.A.,
Yu S., Jenkins J.S., Han Z., Galvez-Ortiz M.C., Gallardo J.,
Garcia-Perez A.E., Weights D., Tinney C.G., Pokorny R.S.
<Mon. Not. R. Astron. Soc., 404, 1817-1834 (2010)>
=2010MNRAS.404.1817Z 2010MNRAS.404.1817Z
ADC_Keywords: Stars, dwarfs ; Photometry, SDSS
Keywords: binaries: general - brown dwarfs - stars: individual: eta Cancri -
stars: late-type - stars: low-mass
Abstract:
We identify 806 ultracool dwarfs (of which 34 are newly discovered L
dwarfs) from their Sloan Digital Sky Survey (SDSS) riz photometry and
obtain proper motions through cross-matching with the United Kingdom
Infrared Telescope Infrared Deep Sky Survey (UKIDSS) and Two-Micron
All-Sky Survey (2MASS). Proper-motion and distance constraints show
that nine of our ultracool dwarfs are members of widely separated
binary systems.
Description:
SDSS (II/294), 2MASS (II/246) and UKIDSS (II/304) photometry of 806
ultra-cool dwarfs. Proper motions are found by dividing the difference
between the 2MASS and UKIDSS coordinates by the observational epoch
difference. Spectral types are based on their SDSS spectra and the
relationship between spectral type and SDSS and 2MASS colors.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 199 806 806 ultracool dwarfs from SDSS, 2MASS and UKIDSS
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
http://surveys.roe.ac.uk/wsa/ : UKIRT Infrared Deep Sky Survey home page
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]
6- 24 A19 ---- SDSS SDSS Name, JHHMMSS.ss+DDMMSS.s
26- 37 F12.8 deg RAdeg Right ascension in decimal degrees (J2000)
40- 51 F12.8 deg DEdeg Declination in decimal degrees (J2000)
53- 57 F5.2 mag imag SDSS i magnitude
59- 62 F4.2 mag e_imag rms uncertainty on imag
64- 68 F5.2 mag zmag SDSS z magnitude
70- 73 F4.2 mag e_zmag rms uncertainty on zmag
75- 79 F5.2 mag Jmag2 2MASS J magnitude
81- 84 F4.2 mag e_Jmag2 ?=- rms uncertainty on Jmag2
86- 90 F5.2 mag Hmag2 2MASS H magnitude
92- 95 F4.2 mag e_Hmag2 ?=- rms uncertainty on Hmag2
97-101 F5.2 mag Kmag2 2MASS Ks magnitude
103-106 F4.2 mag e_Kmag2 ?=- rms uncertainty on Ksmag2
108-112 F5.2 mag Ymag ?=- UKIDSS Y magnitude
114-117 F4.2 mag e_Ymag ?=- rms uncertainty on Ymag
119-123 F5.2 mag Jmag ?=- UKIDSS J magnitude
125-128 F4.2 mag e_Jmag ?=- rms uncertainty on Jmag
130-134 F5.2 mag Hmag ?=- UKIDSS H magnitude
136-139 F4.2 mag e_Hmag ?=- rms uncertainty on Hmag
141-145 F5.2 mag Kmag ?=- UKIDSS K magnitude
147-150 F4.2 mag e_Kmag ?=- rms uncertainty on Kmag
152-155 A4 --- SpT MK spectral type
157-160 I4 mas/yr pmRA Proper motion along RA
162-164 I3 mas/yr e_pmRA rms uncertainty on pmRA
166-169 I4 mas/yr pmDE Proper motion along DE
171-173 I3 mas/yr e_pmDE rms uncertainty on pmDE
175-177 I3 pc Dist Estimated heliocentric distance
179-183 I5 --- MJD ?=- SDSS mjd number
185-188 I4 --- Plate ?=- SDSS plate number
190-192 I3 --- Fiber ?=- SDSS fiber number
194-199 A6 --- Note Note ("binary" or blank)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 04-Dec-2010