S. Jha, P. Garnavich, P. Challis, and R. Kirshner, Harvard- Smithsonian Center for Astrophysics, report that a spectrum of SN 1998fa was taken by P. Berlind on Dec. 27.2 UT with the F. L. Whipple Observatory 1.5-m telescope (+ FAST spectrograph), showing it to be a type-II supernova near maximum light. The spectrum exhibits a blue continuum with a broad P-Cyg H-alpha profile and a strong H-beta absorption. The recession velocity of the host galaxy is 7450 km/s, measured via narrow H-alpha emission, and the supernova photospheric expansion velocity is 13 300 km/s, measured with the broad H-alpha trough.
International Astronomical Union Circular
- Pub Date:
- December 1998