UBV(RI) photometry of cool stars (Cutispoto+, 1996)

Details UBV(RI) photometry of cool stars (Cutispoto+, 1996) UBV(RI) photometry of cool stars (Cutispoto+, 1996)

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ycat..41150041c&link_type=abstract

VizieR On-line Data Catalog: J/A+AS/115/41. Originally published in: 1996A&AS..115...41C

Physics

Photometry: Ubvri, Stars: Late-Type, X-Ray Sources

Scientific paper

We present high-precision UBV(RI)c photometry for a sample of stars detected serendipitously by the EXOSAT satellite. Fourteen objects, out of 47 likely optical counterparts, turned out to be clearly variable, with periods in the range 1-8 days, including a newly discovered eclipsing binary. For most of them the optical variability is consistent with the presence of photospheric cool spots. We have used our multicolour photometry to estimate spectral classifications and distances. The derived distances indicate that some of the observed stars are previously unidentified nearby (d<=25pc) M dwarfs. When combined with the results of high resolution spectroscopy, our photometric observations allow us to investigate the stellar content of the selected X-ray sample. Young stars and RS CVn-type binaries appear to constitute a large fraction of the selected sample. For a description of the UBV and (RI)c photometric systems, see e.g. http://obswww.unige.ch/gcpd/ph01.html and http://obswww.unige.ch/gcpd/ph54.html. (2 data files).

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