Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26as..138...87c&link_type=abstract
Astronomy and Astrophysics Supplement, v.138, p.87-99
Astronomy and Astrophysics
Astrophysics
35
Stars: Activity, Stars: Late-Type, Stars: Pre-Main Sequence, Stars: Variables, X-Rays: Stars
Scientific paper
We present the results of high-precision UBV(RI)_c photometric observations and of spectroscopic radial velocity measurements obtained at the European Southern Observatory for a sample of 51 cool stars detected in the EUV by the ROSAT Wide Field Camera (WFC). Using also recent results from HIPPARCOS, we infer spectral types and investigate the single or binary nature of the sample stars. Optical variability, with periods in the 0.4-13 day range, has been detected for the first time in 15 of these stars. based on data collected at the European Southern Observatory, La Silla, Chile.
Tables 1--5, Figs. 2-27 and the complete data set are available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr or via http://cdsweb.u-strasbg.fr/Abstract.html
Cutispoto Giuseppe
Messina Sergio
Pallavicini Roberto
Pastori Livio
Tagliaferri Giampiero
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