Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-06-18
Mon.Not.Roy.Astron.Soc. 294 (1998) 448
Astronomy and Astrophysics
Astrophysics
9 pages (Latex file) including 4 tables, 8 eps figures. To appear in MNRAS. Also available at http://athena.pd.astro.it/~super
Scientific paper
10.1046/j.1365-8711.1998.01198.x
Extensive photometric and spectroscopic observations of SN1994aj until 540d 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 Mv ~ -17.8 (assuming Ho=75 km/s/Mpc). The spectra of SN1994aj were unusual with the presence of a narrow line with a P-Cygni profile on the 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 days after maximum light the SN ejecta starts to interact with this CSM. The SN luminosity decline rates slowed down (gamma_R=0.46 mag/100d), becoming less steep than the average late luminosity decline of normal SNII (~1 mag/100d). This dense (Mdot/u_w ~ 10^15 g/cm) wind was confined to a short distance from the progenitor (R_out ~ 5x10^16 cm), and results from a very strong mass loss episode (Mdot = 10^-3 Msun/yr), which terminated shortly before explosion (~5-10 yr).
Benetti Stefano
Cappellaro Enrico
Danziger Ivan John
Della Valle Massimo
Patat Ferdinando
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