A it BeppoSAX observation of HD 9770: a visual triple system containing a recently discovered short-period eclipsing binary
Abstract
We have studied the coronal X-ray emission of the recently discovered short-period eclipsing binary HD 9770 with the BeppoSAX satellite. The data from the Low Energy and Medium Energy Concentrator Spectrometers (LECS & MECS) onboard BeppoSAX allow studying the spectrum of this star from 0.1 to 8 keV, confirming that this is a very active coronal source, with strong flaring activity. The X-ray emission most likely originates from the eclipsing binary itself, rather than from the other visual component of the system. The X-ray light curves could be modulated with the orbital period of the eclipsing binary, with a hint for a different orbital modulation of the cooler and hotter plasma. The X-ray spectrum is characterized by hot plasma, with the Fe K complex at 6.7 keV clearly detected in the MECS spectrum, and it is well fitted by a 2-temperature optically thin plasma model with low metal abundances ( ~ 0.3 Z_sun). These results are in line with those found for many other active stars. As expected, during the flare the X-ray emission is dominated by hotter plasma with a temperature > 4 keV. There is an indication that the metal abundance may be somewhat higher during the flare.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- May 1999
- DOI:
- 10.48550/arXiv.astro-ph/9902329
- arXiv:
- arXiv:astro-ph/9902329
- Bibcode:
- 1999A&A...345..514T
- Keywords:
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- STARS: ACTIVITY;
- STARS: BINARIES: ECLIPSING;
- STARS: CORONAE;
- STARS: FLARE;
- STARS: INDIVIDUAL: HD 9770;
- X-RAYS: STARS;
- Astrophysics
- E-Print:
- 8 pages, 4 figures, accepted by A&