NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-18 T02:28:51 PDT
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For refcode 1998MNRAS.294..448B:
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NED Abstract

Copyright by Royal Astronomical Society. 1998MNRAS.294..448B Supernova 1994aj: a probe for pre-supernova evolution and mass-loss from the progenitor S. Benetti, E. Cappellaro, I. J. Danziger, M. Turatto, F. Patat and M. Della Valle Accepted 1997 September 29. Received 1997 September 18; in original form 1997 May 1 ABSTRACT Extensive photometric and spectroscopic observations of SN 1994aj until 540 d after maximum light have been obtained. The photometry around maximum suggests that the SN belongs to the Type II Linear class, with a peak absolute magnitude of M_v_ ~ -17.8 (assuming H_0_=75 km s^-1^ Mpc^- 1^). The spectra of SN 1994aj were unusual, with the presence of a narrow line with a P Cygni profile on top of the broad Balmer line emission. This narrow feature is attributed to the presence of a dense superwind surrounding the SN. At 100-120 d after maximum light the SN ejecta start to interact with this circumstellar material. The SN luminosity decline rates slowed down [{gamma}_R_ = 0.46 mag (100 d)^-1^], becoming less steep than the average late luminosity decline of normal SN II [~1 mag (100 d)^-1^]. This dense (M/u_W_ ~ 10^15^ g cm^-1^) wind was confined to a short distance from the progenitor (R_out_ = 5 x 10^16^cm), and results from a very strong mass-loss episode (M= 10^-3^ M_sun_ yr^-1^), which terminated shortly before explosion (~5-10 yr). Key words: supernovae: general - supernovae: individual: SN 1994aj - supernova remnants.
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