HIPPARCOS Distances of X-ray Selected Stars: Implications on their Nature

Details HIPPARCOS Distances of X-ray Selected Stars: Implications on their Nature HIPPARCOS Distances of X-ray Selected Stars: Implications on their Nature

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..391m&link_type=abstract

Proceedings of the ESA Symposium `Hipparcos - Venice '97', 13-16 May, Venice, Italy, ESA SP-402 (July 1997), p. 391-394

Computer Science

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Scientific paper

We present the parallaxes, measured by Hipparcos, for a sample of X-ray selected stars. The stars belong to the stellar sample of the Einstein Extended Medium Sensitivity Survey. They are all at galactic latitude |b| > 20 deg, and are generally far away from known star forming regions. Several of these stars show lithium abundance and activity level typical of very young stars with ages comparable to that of the Pleiades. We show that the majority of our sample stars are on the main sequence, with ~= 20 per cent being giants. We do not find a significant presence of pre-main sequence stars in our sample, notwithstanding the fact that some of the stars have a considerable lithium abundance, showing that they are most likely young and active main-sequence objects.

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