| Issue |
A&A
Volume 367, Number 2, February IV 2001
|
|
|---|---|---|
| Page(s) | 506 - 512 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361:20000427 | |
| Published online | 15 February 2001 | |
Early time optical spectroscopy of supernova SN 1998S
Indian Institute of Astrophysics, II Block Koramangala, Bangalore 560 034, India
Corresponding author: G. C. Anupama, gca@iiap.ernet.in
Received:
26
June
2000
Accepted:
4
December
2000
We present medium-resolution optical spectra of the type II supernova
SN 1998S
obtained during the pre-maximum, maximum and early decline phases. The early
decline spectra show complex Balmer line profiles: a narrow P-Cygni emission
feature superimposed on a broad emission. The narrow emission has a
redshift similar to that of the host galaxy, indicating its origin from a
pre-supernova circumstellar material. The Hα luminosity of the broad
component implies a shell mass of ∼0.1 
for the supernova
ejecta, while the luminosity of the narrow component implies a mass loss rate
of 
yr-1 for the precursor. The photospheric
temperature of the supernova shell decreased from a value of 
K
on day 17 to a value of 
K on day 44. The observations indicate
SN 1998S belongs to type IIn supernovae where the supernova ejecta dynamically
interact with a pre-supernova circumstellar material.
Key words: supernovae: general / supernovae: individual (SN 1998S)
© ESO, 2001
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