NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-08-18 T02:34:34 PDT
Help | Comment | NED Home

For refcode 2001AJ....121.1648M:
Retrieve 56 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
2001AJ....121.1648M OPTICAL SPECTROSCOPY OF TYPE Ib/c SUPERNOVAE THOMAS MATHESON, ALEXEI V. FILIPPENKO, WEIDONG LI, AND DOUGLAS C. LEONARD Department of Astronomy, University of California, Berkeley, CA 94720-3411; matheson@astron.berkeley.edu, alex@astron.berkeley.edu, weidong@astron.berkeley.edu, leonard@astron.berkeley.edu AND JOSEPH C. SHIELDS Department of Physics and Astronomy, Ohio University, Athens, OH 45701; shields@phy.ohiou.edu Received 2000 June 21; accepted 2000 December 11 ABSTRACT We present 84 spectra of Type Ib/c and Type IIb supernovae (SNe), describing the individual SNe in detail. The relative depths of the helium absorption lines in the spectra of the SNe Ib appear to provide a measurement of the temporal evolution of the SN, with He I {lambda}5876 and He I {lambda}7065 growing in strength relative to He I {lambda}6678 over time. Light curves for three of the SNe Ib provide a sequence for correlating the helium line strengths. We find that some SNe Ic show evidence for weak helium absorption, but most do not. Aside from the presence or absence of the helium lines, there are other spectroscopic differences between SNe Ib and SNe Ic. On average, the O I {lambda}7774 line is stronger in SNe Ic than in SNe Ib. In addition, the SNe Ic have distinctly broader emission lines at late times, indicating a consistently larger explosion energy and/or lower envelope mass for SNe Ic than for SNe Ib. While SNe Ib appear to be basically homogeneous, the SNe Ic are quite heterogeneous in their spectroscopic characteristics. Three SNe Ic that may have been associated with gamma-ray bursts are also discussed; two of these have clearly peculiar spectra, while the third seems fairly typical. Key words: gamma rays-stars: mass loss-supernovae: general
Retrieve 56 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home