T. Matheson, S. Jha, P. Challis, and R. Kirshner, Harvard- Smithsonian Center for Astrophysics, report that a spectrum of SN 2000fo, obtained by M. Calkins on 2000 Dec. 23.08 UT with the F. L. Whipple Observatory 1.5-m telescope (+ FAST spectrograph), shows it to be a type-Ia supernova at maximum light. The spectrum exhibits a possibly reddened continuum, with well-defined Si II, S II, Fe II, Mg II, and Ca II features. Adopting the NASA/IPAC Extragalactic Database recession velocity of 7152 km/s for the host galaxy, the expansion velocity is 11 800 km/s for Si II (rest 635.5 nm). The spectral-feature age of the supernova (Riess et al. 1997, A.J. 114, 722) is 3 +/- 2 days before maximum light.
International Astronomical Union Circular
- Pub Date:
- January 2001