S. Jha, P. Garnavich, P. Challis, and R. Kirshner, Harvard- Smithsonian Center for Astrophysics, write: "A spectrum of SN 1999E, obtained by P. Berlind on Jan. 19.5 UT with the Whipple Observatory 1.5-m telescope (+ FAST spectrograph), displays strong, narrow (FWHM 370 km/s) H-alpha emission superimposed on a broad (FWHM 7000 km/s) base. Weak emission from H-beta is also present. A strong interstellar Na I D absorption feature (equivalent width 0.1 nm) from the host galaxy provides a recession velocity of 7800 km/s. These features suggest that the supernova is of type IIn, and significantly reddened. One peculiarity is a broad (FWHM 18 000 km/s), unidentified absorption feature observed at 597 nm, not typically seen in type-IIn supernovae. The supernova is quite luminous; for V = 16 as reported by Perez et al. (IAUC 7089) and H_0 = 65 km sE-1 MpcE-1, the absolute magnitude is M_V = -19.4. Given the reddening, the intrinsic luminosity of the supernova is likely significantly brighter."
International Astronomical Union Circular
- Pub Date:
- January 1999