Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/2954
Title: Early time optical spectroscopy of supernova SN 1998S
Authors: Anupama, G. C
Sivarani, T
Pandey, G
Keywords: Supernovae: General;Supernovae: Individual (Sn 1998s)
Issue Date: Feb-2001
Publisher: EDP Sciences
Citation: Astronomy and Astrophysics, Vol. 367, No. 2, pp. 506 - 512
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.
URI: http://hdl.handle.net/2248/2954
ISSN: 0004-6361
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Appears in Collections:IIAP Publications

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