Optical Counterparts of X-Ray Sources
Abstract
P. A. Charles, J. R. Thorstensen and S. Bowyer, University of California at Berkeley, report that that the Davidsen et al. (1976, Astrophys. J. 203, 448) candidate for 3U 1728-16 exhibits 4640-4650 A and 4686 A emission, confirming its identification as the optical counterpart; its similarity to Sco X-1 at x-ray and optical wavelengths suggests that it may be variable. They have also discovered a faint star (V ~ 19.2) in the SAS-3 rmc error box of the flaring x-ray source 3U 0042+32 (Rappaport et al. 1977, submitted to Nature) that exhibits 4686 A emission and suggest that it is the optical counterpart; its location (uncertainty +/- 2") is R.A. = 0h42m07s.0, Decl. = +32o44'09" (equinox 1950.0).
- Publication:
-
International Astronomical Union Circular
- Pub Date:
- August 1977
- Bibcode:
- 1977IAUC.3096....2C