dc.contributor.author |
Anupama, G. C |
|
dc.contributor.author |
Sivarani, T |
|
dc.contributor.author |
Pandey, G |
|
dc.date.accessioned |
2008-07-31T05:08:02Z |
|
dc.date.available |
2008-07-31T05:08:02Z |
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dc.date.issued |
2001-02 |
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dc.identifier.citation |
Astronomy and Astrophysics, Vol. 367, No. 2, pp. 506 - 512 |
en |
dc.identifier.issn |
0004-6361 |
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dc.identifier.uri |
http://hdl.handle.net/2248/2954 |
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dc.description.abstract |
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 Msun for the supernova ejecta, while the luminosity of the narrow component implies a mass loss rate of 10-4 M<sun yr-1 for the precursor. The photospheric temperature of the supernova shell decreased from a value of 18 400+/- 2900 K on day 17 to a value of 7500+/- 1200 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. |
en |
dc.format.extent |
259651 bytes |
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dc.format.mimetype |
application/pdf |
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dc.language.iso |
en |
en |
dc.publisher |
EDP Sciences |
en |
dc.relation.uri |
http://www.aanda.org/index.php?option=article&access=standard&Itemid=129&url=/articles/aa/abs/2001/08/aa10043/aa10043.html |
en |
dc.subject |
Supernovae: General |
en |
dc.subject |
Supernovae: Individual (Sn 1998s) |
en |
dc.title |
Early time optical spectroscopy of supernova SN 1998S |
en |
dc.type |
Article |
en |