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Detection of Pre-Shock Dense Circumstellar Material of SN 1978K
You-Hua Chu, Adeline Caulet, Marcos Montes +3
The supernova SN 1978K has been noted for its lack of emission lines broader than a few thousand km/s since its discovery in 1990. Modeling of the radio spectrum of the peculiar SN…
Late-Time Optical and UV Spectra of SN 1979C and SN 1980K
Robert A. Fesen, Christopher L. Gerardy, Alexei V. Filippenko +8
A low-dispersion Keck I spectrum of SN 1980K taken in August 1995 (t = 14.8 yr after explosion) and a November 1997 MDM spectrum (t = 17.0 yr) show broad 5500 km s^{-1} emission li…
Hubble Space Telescope WFPC2 Imaging of SN 1979C and Its Environment
Schuyler D. Van Dyk, Chien Y. Peng, Aaron J. Barth +6
The locations of supernovae in the local stellar and gaseous environment in galaxies contain important clues to their progenitor stars. As part of a program to study the environmen…
Recent Star Formation in Sextans A
Schuyler D. Van Dyk, Daniel Puche, Tony Wong
We investigate the relationship between the spatial distributions of stellar populations and of neutral and ionized gas in the Local Group dwarf irregular galaxy Sextans A. This ga…
Radio Observations of SN 1980K: Evidence for Rapid Presupernova Evolution
Marcos J. Montes, Schuyler D. Van Dyk, Kurt W. Weiler +2
New observations of SN 1980K made with the VLA at 20 and 6 cm from 1994 April through 1996 October show that the supernova (SN) has undergone a significant change in its radio emis…
Radio Supernovae as Distance Indicators
K. W. Weiler, S. D. Van Dyk, M. J. Montes +2
Long-term monitoring of the radio emission from supernovae with the Very Large Array (VLA) shows that the radio ``light curves'' evolve in a systematic fashion with a distinct peak…