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Title:
A Search for Very Low Mass Pre-Main-Sequence Stars in Taurus
Authors:
Briceño, César; Hartmann, Lee; Stauffer, John; Martín, Eduardo
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; ), AB(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; ), AC(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; ), AD(Department of Astronomy, University of California at Berkeley, Berkeley, CA 94720-3411)
Publication:
The Astronomical Journal, Volume 115, Issue 5, pp. 2074-2091. (AJ Homepage)
Publication Date:
05/1998
Origin:
AJ
AJ Keywords:
STARS: EVOLUTION, STARS: FORMATION, STARS: LOW-MASS, BROWN DWARFS
DOI:
10.1086/300338
Bibliographic Code:
1998AJ....115.2074B

Abstract

We present the initial results of a deep CCD survey for very low mass pre-main-sequence (PMS) stars in selected fields 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 I_C ~ 19 at (R - I)_C ~ 2.5, which enables us to probe well below the hydrogen burning limit at 1-2 Myr. From follow-up spectroscopic observations we have identified nine new low-mass T Tauri stars (TTSs). A large fraction of the new PMS objects (5/9) have very low masses as inferred from their late spectral types (>=M5), and comparison with recent evolutionary tracks and Pleiades brown dwarfs suggests that our M6-M6.5 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 ~38% increase in the known PMS population of our survey area and a factor of ~2 increase in the number of known late-type TTSs. In spite of our sensitivity, we detect no young stars with spectral types later than ~M7. Our results illustrate the importance of spectroscopy in eliminating foreground M stars. Observations reported in this paper were obtained at the Multiple Mirror Telescope Observatory, a facility operated jointly by the University of Arizona and the Smithsonian Institution.
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