ROSAT observations of the RSCVn binary σ Geminorum.
Abstract
X-ray observations of the RSCVn system σ Geminorum have been undertaken with the ROSAT observatory. Several spectra of very good signal-to-noise ratio were obtained. Spectral fitting using metal abundances amounting to 50% of solar values reveal two temperature components at 2MK and 12MK. Previous EXOSAT observations showed another component at 40MK. Particular interest is focused on the temporal variations of the X-ray emission. It is found that variations occur on time scales ranging from years to hours and minutes.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- February 1997
- Bibcode:
- 1997A&A...318..791Y
- Keywords:
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- STARS: CORONAE;
- X-RAYS: STARS;
- STARS: INDIVIDUAL: {SIGMA} GEM