* Astronomy

DETECTION OF A LARGE FLARE IN FR Cnc
FR Cnc (= BD+16◦1753 = MCC 527 = 1ES 0829+15.9 = 1RXS J083230.9+154940 = HIP 41889 = GSC 01392-02634 = TYC 1392-2634-1) (alpha2000 = 08h32m30.s5287 and delta2000 = +15◦49′26.′′193) was first mentioned as a probable active star when it was identified as the optical counterpart of a soft X-ray source 1ES 0829+15.9 in the Einstein Slew Survey. It has V = 10.m 43, spectral type K8V, the X-ray flux is of about 10^−11 erg · s^−1 · cm^−2 (Elvis et al., 1992; Schachter et al., 1996). It was classified as BY Dra type star (i.e. its variability is caused by rotational modulation of starspots) and given the name FR Cnc by Kazarovets et al. (1999). The presence of Ca II H, K and H emission lines in the spectra indicates high chromospheric activity in FR Cnc (Pandey et al., 2002; Pandey, 2003). The other details concerning history of investigation of this object can be found in Pandey et al. (2005) Flares in FR Cnc were not previously reported.

Read more (109KB, PDF)