T Tauri and Chromospherically Active Stars in the SDSS I: Photometric Selection and First Results

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Scientific paper

We present first results from the Sloan Digital Sky Survey T Tauri and flare star program including new Classical T Tauris and related emission line stars selected on the basis of SDSS u*g^*r^*i^*z^* photometry and spectroscopically verified using the facilities at Apache Point Observatory (APO) and Calar Alto Observatory (CAHA). The photometric search criteria make use of reddening invariant combinations of the SDSS passbands to select for late spectral type stars exhibiting an ultraviolet excess. The depth of the SDSS UV-excess technique is compared with other wide-field surveys including IRAS, RASS, and, in detail, 2MASS, where it is evident that the SDSS will excel in the detection of dMe and the post-circumstellar disk Weak-lined T Tauris that are expected to comprise the bulk of the high galactic latitude pre-main-sequence star population.

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