Ultra-cool Dwarfs from Large Area Surveys

Details Ultra-cool Dwarfs from Large Area Surveys Ultra-cool Dwarfs from Large Area Surveys

2009-02-16

arxiv.org/abs/0902.2677v2

Proceedings of 10th Asian-Pacific Regional IAU Meeting 2008, P 191-193

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

3 pages, 4 figures, Proceeding of 10th Asian-Pacific Regional IAU Meeting 2008, oral talk

Scientific paper

We selected brown dwarf candidates from the seventh Data Release of the Sloan Digital Sky Survey (SDSS DR7) with new photometric selectioncriteria based on a parameteriaztion of well-known L and T dwarfs. Then we confirmed their status with SDSS spectra. The candidates without SDSS spectra are cross matched in the Two Micron All Sky Survey (2MASS) and the Fourth Data Release of the UKIRT Infrared Deep Sky Survey (UKIDSS DR4). With the help of colors based on SDSS, 2MASS and UKIDSS, we are able to estimate spectral types of our candidates. We obtain reliable proper motions using positional and epoch information downloaded direct from the survey databases.

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