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[16.05] T Tauri and Chromospherically Active Stars in the SDSS II: Variability

P.M. McGehee (LANL), Z. Ivezic (Princeton), S.L. Hawley (U. Washington)

The detection of pre-main sequence and magnetically active low mass stars in the field via ultraviolet excess is complicated by the presence of white dwarf - M dwarf pairs (WD+M) in which the white dwarf signature mimics the excess continuum due to accretion or chromospheric activity. However, the use of synoptic survey data permits a clean separation between the WD+M and candidate T Tauris and dMe on the grounds of near-UV and blue variability.

We utilize multi-epoch photometry obtained by the Sloan Digital Sky Survey to identify possible PMS and magnetically active M stars using changes in the SDSS u^* and g^* magnitudes. The spatial location of the resulting candidates are studied in relation to that of high-latitude molecular clouds.

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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.