Photometry of cool stars detected in extreme-ultraviolet (EUV) all-sky surveys.
Abstract
We present high-precision UBV(RI)_c_ photometry for a small sample of cool stars detected at EUV wavelengths by the ROSAT WFC and/or the EUVE all-sky survey. Four out of the five stars observed are variable and one of them is an eclipsing binary. Amplitudes up to 0.38 magnitudes in the V band have been observed and clear colour variations have been found. We have computed the photometric periods and deduced approximate spectral classifications and distances.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- May 1995
- Bibcode:
- 1995A&A...297..764C
- Keywords:
-
- STARS: ACTIVITY;
- STARS: LATE-TYPE;
- STARS: VARIABLES;
- X RAY: STARS;
- ULTRAVIOLET: STARS