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J/A+A/497/619       New ultra-cool dwarfs from SDSS and 2MASS     (Zhang+, 2009)

Ultra-cool dwarfs: new discoveries, proper motions, and improved spectral typing from SDSS and 2MASS photometric colors. Zhang Z.H., Pokorny R.S., Jones H.R.A., Pinfield D.J., Chen P.S., Han Z., Chen D., Galvez-Ortiz M.C., Burningham B. <Astron. Astrophys. 497, 619 (2009)> =2009A&A...497..619Z
ADC_Keywords: Infrared sources ; Stars, late-type ; Photometry, SDSS ; Photometry, infrared Keywords: stars: low-mass, brown dwarfs - stars: late-type Abstract: We try to identify ultra-cool dwarfs from the seventh Data Release of the Sloan Digital Sky Survey (SDSS DR7) with SDSS i-z and r-z colors. We also obtain proper motion data from SDSS, 2MASS, and UKIDSS and improve spectral typing from SDSS and 2MASS photometric colors. Description: SDSS and 2MASS photometry of 129 ultra-cool dwarf candidates. The photometric data are from the seventh Data Release of the SDSS Photometric and the 2MASS All-Sky Catalog of Point Sources. Proper motions are found by dividing the difference between the 2MASS and SDSS coordinates by the observational epoch difference. Spectral types are based on the relationship between spectral type and SDSS and 2MASS colors. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table7.dat 124 129 SDSS and 2MASS photometry of 129 ultra-cool dwarf candidates
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) II/282 : The SDSS Photometric Catalog, Release 6 (Adelman-McCarthy+, 2007) : SDSS Home Page Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1- 19 A19 --- SDSS SDSS Name ( 22- 26 F5.2 mag rmag SDSS r band magnitude 29- 32 F4.2 mag e_rmag rms uncertainty on rmag 35- 39 F5.2 mag imag SDSS r band magnitude 42- 45 F4.2 mag e_imag rms uncertainty on imag 48- 52 F5.2 mag zmag SDSS r band magnitude 55- 58 F4.2 mag e_zmag rms uncertainty on zmag 61- 65 F5.2 mag Jmag 2MASS J band magnitude 68- 71 F4.2 mag e_Jmag rms uncertainty on Jmag 74- 78 F5.2 mag Hmag 2MASS H band magnitude 81- 84 F4.2 mag e_Hmag rms uncertainty on Hmag 87- 91 F5.2 mag Kmag 2MASS K band magnitude 94- 97 F4.2 mag e_Kmag rms uncertainty on Kmag 100-103 F4.2 arcsec/yr pm ? Proper motion 106-109 F4.2 arcsec/yr e_pm ? rms uncertainty of pm 112-114 I3 deg pmPA ? Proper motion angle 117-118 I2 deg e_pmPA ? rms uncertainty of pmPA 121-124 A4 --- Sp Spectral type by colors
Acknowledgements: Zenghua Zhang, zenghuazhang(at)
(End) Zenghua Zhang [Hertfordshire Univ., UK], P. Vannier [CDS] 11-Apr-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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