R. Hjellming, D. Hogg and H. Hvatum, National Radio Astronomy Observatory; and P. Gregory and R. Taylor, University of British Columbia, report the following radio position for the highly variable radio source GT 0236+610 (cf. IAUC 3164): R.A. = 2h36m40s.62 +/- 0s.14, Decl. = +61o00'54" +/- 1" (equinox 1950.0). The observations were obtained with six antennae of the Very Large Array at 4885 MHz on Feb. 11 and 12. The source flux density had a mean value of ~ 50 mJy but varied by almost a factor of two from Feb. 11 to 12. These authors independently suggested the OB+ star LSI+61 303 (cf. IAUC 3170) as the optical counterpart, and their measured coordinates from the Palomar Sky Survey prints, R.A. = 2h36m40s.60 +/- 0s.14, Decl. = +61o00'54".1 +/- 1" (equinox 1950.0), confirm the identification. D. Crampton and J. B. Hutchings, Dominion Astrophysical Observatory, report that spectroscopic observations of LSI +61 303 reveal a highly reddened star of spectral type B1Ib with unusually broad emission lines at H-alpha and H-beta. Sharp central absorption lines are superimposed on the emission features, which have a total width of ~ 900 km/s, in contrast to the 200 km/s width of the absorption lines. Further photometric and spectroscopic observations should be obtained to look for variability.
International Astronomical Union Circular
- Pub Date:
- February 1978