UBVy photometry of cool stars (Cutispoto+, 2000)

Details UBVy photometry of cool stars (Cutispoto+, 2000) UBVy photometry of cool stars (Cutispoto+, 2000)

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000ycat..33640205c&link_type=abstract

VizieR On-line Data Catalog: J/A+A/364/205. Originally published in: 2000A&A...364..205C

Computer Science

Photometry: Ubv, Stars: Late-Type, X-Ray Sources, Radial Velocities

Scientific paper

We present high-precision photometry, high- and medium-resolution spectroscopy for a sample of 32 stars likely to be the optical counterparts of X-ray sources serendipitously detected by the EXOSAT satellite. Using also recent results from the Hipparcos satellite, we infer spectral types, compute X-ray luminosities and Li abundances and investigate the single or binary nature of the sample stars. We found eleven new variable stars, whose photometric periods fall in the 1.2-27.5 day range, for most of which the optical variability is consistent with the presence of photospheric cool spots. For our sample of X-ray selected stars we confirm the existence of a strong correlation between the stellar rotation rate and the level of activity, and also between the X-ray and bolometric luminosities. Two stars in our sample are likely to be pre-main sequence objects, one is likely to be a previously unknown M-type star within 25pc. (5 data files).

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