Supernova 2002bo in NGC 3190
Abstract
T. Matheson, S. Jha, P. Challis, and R. Kirshner, Center for Astrophysics, report that a spectrum (range 370-750 nm) of SN 2002bo, obtained by V. Hradecky on Mar. 10.25 UT with the Mt. Hopkins 1.5-m telescope (+ FAST), shows it to be a reddened and possibly peculiar type-Ia supernova well before maximum. Adopting the NED recession velocity of 1271 km/s for the host galaxy, the supernova expansion velocity is about 17 900 km/s for Si II (rest 635.5 nm). This expansion velocity implies an age of approximately 2 weeks before maximum, based upon comparison with values presented by Jha et al. (1999, Ap.J. Supp. 125, 73). The spectrum shows strong, narrow Na I D absorptions at the velocity of the host galaxy (0.3 nm EW). The Schlegel et al. (1998, Ap.J. 500, 525) dust maps indicate a Galactic reddening of E(B-V) = 0.025. Several titanium absorption features appear stronger than usual, indicating that this may be a subluminous event similar to SN 1999by (see Garnavich et al. 2002, Ap.J., in press, http://xxx.lanl.gov/abs/astro-ph/?0105490).
- Publication:
-
International Astronomical Union Circular
- Pub Date:
- March 2002
- Bibcode:
- 2002IAUC.7849....2M