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Astron. Astrophys. 356, 157-162 (2000)

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New discovery of weak-line T Tauri stars in high-Galactic latitude molecular clouds

J.Z. Li 1,2,3, J.Y. Hu 1,2 and W.P. Chen 3

1 Beijing Astronomical Observatory, Chinese Academy of Sciences, Beijing 100012, P.R. China (ljz@nova.bao.ac.cn)
2 National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, P. R. China
3 Institute of Astronomy, National Central University, Taiwan, Chung-Li 32054

Received 7 April 1999 / Accepted 11 January 2000

Abstract

Star formation efficiency in translucent molecular clouds has long been an unresolved and key issue in the field of low-mass star formation. In this paper, we report on the results of our survey for low-mass star formation in high-Galactic latitude molecular clouds, especially those of the translucent category, based on the ROSAT All-Sky Survey. Nine new weak-line T Tauri star candidates have been discovered at high-Galactic latitudes, among which, 6 are seen against - thus possibly associated with - the translucent molecular clouds, MBM 16, MBM 19 and MBM 55. Further study on the Li-rich X-ray active sources is necessary to shed more light on star formation in translucent molecular clouds.

Key words: stars: formation – stars: pre-main sequence – ISM: clouds

Send offprint requests to: J.Z. Li

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© European Southern Observatory (ESO) 2000

Online publication: March 28, 2000
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