Access to Astronomical Catalogues

← Click to display the menu
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
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file catalog.dat 199 806 806 ultracool dwarfs from SDSS, 2MASS and UKIDSS
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009) : UKIRT Infrared Deep Sky Survey home page Byte-by-byte Description of file: catalog.dat
Bytes Format Units Label Explanations
1- 4 A4 --- --- [SDSS] 6- 24 A19 ---- SDSS SDSS Name, 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
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

catalogue service