| Attributs | Valeurs |
|---|
| type
| |
| Is Part Of
| |
| Subject
| |
| Title
| - Early time optical spectroscopy of supernova SN 1998S
|
| Date
| |
| has manifestation of work
| |
| related by
| |
| Author
| |
| 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 α luminosity of the broad component implies a shell mass of ∼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.
|
| article type
| |
| publisher identifier
| |
| Date Copyrighted
| |
| Rights
| |
| Rights Holder
| |
| is part of this journal
| |
| is primary topic
of | |
