Astron. Astrophys., Suppl. Ser., 132, 173-179 (1998/October-2)
Newly discovered candidate weak-line T Tauri stars in the surrounding area of the Taurus-Auriga region.
LI J.Z. and HU J.Y.
Abstract (from CDS):
We present results of an extensive search for weak-line T Tauri stars (WTTS) in the outskirts of the Taurus-Auriga molecular cloud on the basis of the ROSAT All-Sky Survey Bright Source Catalog. Our surveyed region extends from 2h
in right ascension and from 10° to 40° in declination, with the central part of Taurus-Auriga (4h
, 15°<δ< 34°), accomplished by Wichmann et al. (1996A&A...312..439W
), excluded. Within a sky coverage of about 103
square degrees, 219 X-ray sources fulfil the criteria for selecting program sources suggested by Neuhaeuser et al. (1995A&A...295L...5N
), and 164 of these X-ray sources were found to have at least one optical counterpart with E magnitude brighter than 16. Low-resolution spectroscopic observation has been carried out in order to discard early type stars and galaxies from the sample, additional intermediate-resolution spectra of a sub-sample of 156 late type optical counterparts were obtained for spectral classification and for the calculation of the equivalent width of Hα
emission and LiI line absorption at 6707Å. Excluding 2 previously identified WTTS, a total of 75 new candidate WTTS and one possible classical T Tauri star have been discovered in our study. The majority of the newly found Li-rich optical counterparts are believed to be PMS stars rather than ZAMS stars as those of the Pleiades.
stars: formation - stars: pre-main sequence - X-ray: stars - surveys
VizieR on-line data:
<Available at CDS (J/A+AS/132/173): table2.dat table3.dat table4.dat table5.dat tables.ps tables.tex>
Tables 1-5: [LH98] NNN, [LH98] NNNs, N=169 among (Nos 1-219).
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