A0535+26 = HDE 245770
Abstract
C. Bartolini, A. Guarnieri and A. Piccioni, Istituto di Astronomia, Universita di Bologna; and A. Giangrande and F. Giovannelli, Laboratorio di Astrofisica Spaziale, Frascati, communicate: "On Mar. 4.92 UT we monitored HDE 245770, the optical counterpart of A0535+26. The UBV photoelectric observations are contemporaneous with the x-ray outburst of the source on the same date (Sims and Fraser, IAUC 3339). During the 220 min of observations, we did not detect any slope in the lightcurve of the star, which appears at a lower luminosity level with respect to that reported by Bartolin et al. (IAUC 3167). The mean magnitude differences (HDE 245770 minus comparison star) with respect to the star BD +26 876 were: dU = +0.418, dB = +1.282, dV = +1.041; and with respect to BD +25 902 were: dU = +4.562, dB = +4.478, dV = +3.800. Standard deviations are 0.002 magnitude for V and 0.005 magnitude for U and B."
- Publication:
-
International Astronomical Union Circular
- Pub Date:
- June 1979
- Bibcode:
- 1979IAUC.3367....2B