SIMBAD references

2003A&A...399..279F - Astronomy and Astrophysics, volume 399, 279-285 (2003/2-3)

BeppoSAX observations of CF Tucanae and TY Pyxidis.

FRANCIOSINI E., PALLAVICINI R. and TAGLIAFERRI G.

Abstract (from CDS):

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 20-25MK, with only a factor of two difference in the emission measures. During the flares, temperatures of ∼30-40MK 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∼0.1-0.2Z), while for TY Pyx we find Z∼0.5-0.6Z. For both stars the coronal metallicities are in good agreement with their measured photospheric abundances.

Abstract Copyright:

Journal keyword(s): stars: binaries: close - stars: activity - stars: coronae - stars: individual: CF Tuc - stars: individual: TY Pyx - X-rays: stars

Simbad objects: 7

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2020.02.21-05:22:51

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