P. A. Feldman, Herzberg Institute of Astrophysics, reports the detection of a large radio outburst from the RS-CVn-binary HR 5110 = HD 118216 with the 46-m telescope of the Algonquin Radio Observatory. The flare was first detected on May 29d08h26m UT with a flux density of 425 mJy at 10.76 GHz. Measurements made over the next two days have shown continued flaring activity in the range 0.20-0.35 Jy. Observations at radio, optical, ultraviolet, and x-ray wavelengths are urged. J. L. Linsky, University of Colorado, reports: "We obtained International Ultraviolet Explorer spectra of HR 5110 on May 31 at 17h00m UT. A 30-min low-dispersion exposure with the short-wavelength camera on IUE shows strong emission lines at L-alpha 1216 A, N V 1240 A, O I 1304 A, C II 1335 A, O V 1370 A, Si IV 1400 A, C IV 1550 A, and He II 1640 A. This high-excitation spectrum indicates material at temperatures up to 250 000 K, which is likely produced at the secondary star of the system." He adds that the Algonquin Radio Observatory reported the 10.76-GHz flux as 215 mJy on May 31d08h36m.
International Astronomical Union Circular
- Pub Date:
- June 1979