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Date and Time of the Query: 2019-06-25 T20:58:26 PDT
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For refcode 2009ApJ...692..839M:
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2009ApJ...692..839M The Evolution of Late-Time Optical Emission from SN 1979C Milisavljevic, Dan; Fesen, Robert A.; Kirshner, Robert P.; Challis, Peter Abstract. Optical spectra of the bright Type II-L supernova SN 1979C obtained in April 2008 with the 6.5 m Multiple Mirror Telescope are compared with archival late-time spectra to follow the evolution of its optical emission over the age range of 11-29 years. We estimate an H{alpha} flux decrease of around 35% from 1993 to 2008 but noticeable increases in the strength of blueshifted emission of forbidden oxygen lines. While the maximum expansion of the broad ~6700 km s^-1^ H{alpha} emission appears largely unchanged from 1993, we find a significant narrowing of the double-peaked emission profiles in the [O I] {lambda}{lambda}6300, 6364 and [O II] {lambda}{lambda}7319, 7330 lines. A comparison of late-time optical spectra of a few other Type II SNe which, like SN 1979C, exhibit bright late-time X-ray, optical, and radio emissions, suggests that blueshifted double-peaked oxygen emission profiles may be a common phenomenon. Finally, detection of a faint, broad emission bump centered around 5800 Angstrom suggests the presence of WC-type Wolf-Rayet stars in the SN's host star cluster. Key words: circumstellar matter, supernovae: general, supernovae: individual: SN 1979C, supernova remnants
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