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Y.-H. Chu (UIUC), S.D. Van Dyk (IPAC), R.A. Gruendl (UIUC)
Type II supernovae (SNe) have massive progenitors. Prior to the SN detonation, they have a long history of copious mass loss. Pre-shocked circumstellar material can be identified through the presence of [N II]-bright, narrow-velocity components in the spectra of SNe (e.g., SN1978K; Chu et al. 1999, ApJ, 512, L51). These features should be common in type II SNe.
We made high-dispersion echelle observations of 15 type II SNe with the KPNO 4-m telescope in March, 1999. Of these, six SNe were detected. Only four show a narrow H\alpha component, but none show corresponding bright, narrow [N II] emission. In this poster we present these results and their interpretation.
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