S. L. Mufson, Indiana University; and W. Z. Wisniewski and R. S. McMillan, Lunar and Planetary Laboratory, report the detection of a point source of x-rays within 30" of the peculiar variable star KR Aur on HEAO-2 measurements made during 1979 Sept. 20-21. The soft x-ray flux (0.15-4.5 keV) was (1.9 +/- 0.3) x 10**-15 J m**-2 s**-1 for a thermal spectrum (temperature 10**7-10**8 K). Another point x-ray source, 5' to the southwest and 20 percent as bright, was also detected in the field. On 1979 Sept. 19 infrared fluxes of KR Aur were measured on the University of Arizona's 1.5-m telescope to be J = 12.73, H = 12.70 and K = 12.64. On 1979 Mar. 30 the optical fluxes measured on the same telescope were U = 12.11, B = 13.03, V = 13.00, R = 12.86 and I = 12.80.
International Astronomical Union Circular
- Pub Date:
- April 1980