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Issue A&A
Volume 367, Number 2, February IV 2001
Page(s) 506 - 512
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20000427



A&A 367, 506-512 (2001)
DOI: 10.1051/0004-6361:20000427

Early time optical spectroscopy of supernova SN 1998S

G. C. Anupama, T. Sivarani and G. Pandey

Indian Institute of Astrophysics, II Block Koramangala, Bangalore 560 034, India

(Received 26 June 2000 / Accepted 4 December 2000)

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 H$\alpha$ luminosity of the broad component implies a shell mass of $\sim$0.1 $M_\odot$ for the supernova ejecta, while the luminosity of the narrow component implies a mass loss rate of $10^{-4} M_\odot$ yr-1 for the precursor. The photospheric temperature of the supernova shell decreased from a value of $18 400\pm 2900$ K on day 17 to a value of $7500\pm 1200$ 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.


Key words: supernovae: general -- supernovae: individual (SN 1998S)

Offprint request: G. C. Anupama, gca@iiap.ernet.in

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