Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...399..279f&link_type=abstract
Astronomy and Astrophysics, v.399, p.279-285 (2003)
Astronomy and Astrophysics
Astrophysics
6
Stars: Binaries: Close, Stars: Activity, Stars: Coronae, Stars: Individual: Cf Tuc, Stars: Individual: Ty Pyx, X-Rays: Stars
Scientific paper
We present the results of BeppoSAX observations of the RS CVn binary systems CF Tuc and TY Pyx. A long-duration flare was detected on CF Tuc just at the beginning of the observation; a second smaller flare occurred about half a period later. The light curve of TY Pyx shows a significant orbital modulation of the quiescent emission with possible evidence for eclipses, and strong flares. We find that the coronae of the two stars are very similar: both systems have quiescent temperatures of ~ 10 and 20-25 MK, with only a factor of two difference in the emission measures. During the flares, temperatures of ~ 30-40 MK are reached; these temperatures are not high enough to give detectable hard X-ray emission in the PDS. Both stars have subsolar coronal metallicities: we confirm the very low coronal abundance of CF Tuc (Z ~ 0.1-0.2 Zsun), while for TY Pyx we find Z ~ 0.5-0.6 Zsun. For both stars the coronal metallicities are in good agreement with their measured photospheric abundances.
Franciosini Elena
Pallavicini Roberto
Tagliaferri Giampiero
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