D. L. Welch, McMaster University, reports that the MACHO collaboration (cf. IAUC 6312) has discovered what appears to be a variable star in images obtained during monitoring of the Large Magellanic Cloud. The object peaked in brightness around 1997 Dec. 22 UT at V = 19.0 and is located at R.A. = 4h57m46s.2, Decl. = -67o41'08" (equinox 2000.0). The last image before outburst was taken on Dec. 3.511, and the next observation, on Dec. 14.494, indicates that the object had brightened by at least 1.3 mag to V about 19.1. Eight pairs of red and blue images taken after outburst are consistent with typical supernova fading timescales, and there is a possible galaxy located 3" to the west of the variable (finder charts can be obtained at http://wwwmacho.mcmaster.ca/SN/index.html). It is therefore possible that this variable is a supernova in a galaxy beyond the LMC. No activity is present in 160 prior observations stretching back two years.
International Astronomical Union Circular
- Pub Date:
- January 1998