A Search for Very Low Mass Pre–Main-Sequence Stars in Taurus

César Briceño, Lee Hartmann, John Stauffer, Eduardo Martín
1998 Astronomical Journal  
We present the initial results of a deep CCD survey for very low mass preÈmain-sequence (PMS) stars in selected Ðelds of the Taurus molecular cloud complex. The results reported herein span a little over half a square degree in the dark clouds L1495, L1529, L1551, and B209. Our survey is complete down to at which enables us to probe well below the hydrogen burning limit at 1È2 Myr. .5, From follow-up spectroscopic observations we have identiÐed nine new low-mass T Tauri stars (TTSs). A large
more » ... (TTSs). A large fraction of the new PMS objects (5/9) have very low masses as inferred from their late spectral types (ºM5), and comparison with recent evolutionary tracks and Pleiades brown dwarfs suggests that our M6ÈM6.5 new TTSs are very young brown dwarfs. Two of the new TTSs may constitute a new, moderately embedded, binary classical T Tauri system. The new young stars represent a D38% increase in the known PMS population of our survey area and a factor of D2 increase in the number of known late-type TTSs. In spite of our sensitivity, we detect no young stars with spectral types later than DM7. Our results illustrate the importance of spectroscopy in eliminating foreground M stars.
doi:10.1086/300338 fatcat:ygwfrgof5bbhtbbvypufyo2id4