P. A. Feldman and J. M. MacLeod, Herzberg Institute of Astrophysics, report that a relatively intense radio flare was observed from the noneclipsing RS CVn binary HR 1099 during Nov. 22-25 at 10.5 and 6.25 GHz with the 46-m telescope of the Algonquin Radio Observatory. The initial rise of the outburst (at 10.5 GHz) took place in less than 2 days, with the highest observed flux density (135 +/- 10 mJy) occurring on Nov. 24.28 UT. The single measurement of radio spectral index that could be made, on Nov. 25.1 UT during the declining phase of the flare, was characteristic of nonthermal decay. This outburst was therefore quite similar to the 1974 Aug. 11-14 radio event in UX Ari, another noneclipsing RS CVn binary (Gibson et al. 1975, Astrophys. J. 200, L99).
International Astronomical Union Circular
- Pub Date:
- December 1976