A lithium-survey for pre-main sequence stars in the Upper Scorpius OB association

Details A lithium-survey for pre-main sequence stars in the Upper Scorpius OB association A lithium-survey for pre-main sequence stars in the Upper Scorpius OB association

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...333..619p&link_type=abstract

Astronomy and Astrophysics, v.333, p.619-628 (1998)

Astronomy and Astrophysics

Astrophysics

68

Surveys, Stars: Kinematics, Stars: Pre-Main Sequence, Open Clusters And Associations: Individual: Sco-, En Association, X-Rays: Stars

Scientific paper

We present the results of an intermediate resolution spectroscopic survey for pre-main sequence (PMS) stars in the Upper Scorpius OB association. In a 160 square-degree area we were able to identify 39 new PMS stars by follow up observations of X-ray selected stars with the multi object spectrograph FLAIR at the UK Schmidt Telescope. We also investigated the completeness of our X-ray selected sample by observing more than 100 stars that were not detected as X-ray sources, but have proper motions indicating membership to Upper Sco. While the new X-ray selected PMS stars with known proper motions have kinematics consistent with membership, none of the X-ray quiet proper motion candidates is a PMS star. We conclude that our X-ray selected sample of PMS stars seems to be rather complete. For stars in the magnitude interval 11.5 < B < 13.5 we derive a conservative lower limit of 75% completeness. Based on observations obtained at the UK Schmidt Telescope of the Anglo-Australian Observatory

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