HZ 43
Abstract
C. C. Wu, P. R. Wesselius, R. J. van Duinen, J. W. G. Aalders and K. S. de Boer, Space Research Department, Kapteyn Institute, University of Groningen, write: "HZ 43 (R.A. = 13h14m.0, Decl. = +29o22', equinox 1950.0), a possible optical counterpart of the soft x-ray source MX1313+29, was observed between 1550 and 3300 A in five energy channels with the ultraviolet instrument on board the Astronomical Netherlands Satellite. Observations were made once on 1974 Dec. 26.11 UT and four times between 1975 June 27.19 and 27.67 UT. The ultraviolet flux was at 1.14 x 10**-9 erg cm**-2 s**-1 and no significant change was detected in this six-month period. Spectral energy distribution gives a blackbody temperature of 57 000 K. Numerous pointings were made closer to the expected position of MX 1313+29 (R.A. = 13h13m.4, Decl. = +29o33', equinox 1950.0), but no ultraviolet signal was detected in an area of 2'.5 by 2'.5."
- Publication:
-
International Astronomical Union Circular
- Pub Date:
- July 1975
- Bibcode:
- 1975IAUC.2805....3W