Other
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.5502m&link_type=abstract
American Astronomical Society, 182nd AAS Meeting, #55.02; Bulletin of the American Astronomical Society, Vol. 25, p.893
Other
Scientific paper
We present high quality optical to near-infrared spectra of SN 1993J in M81. The initial spectrum, obtained on March 30.3 UT, two days after discovery, is featureless on large scales, but contains many broad peaks and valleys with relative amplitudes of approximately 2-8%. The largest bump occurs at 5360 Angstroms, with others near 4500, 5610, and 6450 Angstroms. The emission feature at 6450 Angstroms has a corresponding absorption trough with a minimum at 6270 Angstroms, which may be a weak P-Cygni profile. If this is Hα , the expansion velocity derived from the minimum of the trough would be 13,000 km s(-1) , with an emission peak blueshifted by 5000 km s(-1) . In addition to the broad features, SN 1993J exhibited several narrow emission lines at this early stage. One is at 6560 Angstroms, and is identified with Hα . Another is He II lambda 4686 at 4684 Angstroms, and a line at 6371 Angstroms that is possibly [Fe X] lambda 6374. The high-excitation emission could be the result of ionization of circumstellar gas by the ultraviolet radiation from the stellar surface after the supernova shockwave has broken out. There are also several interstellar absorption lines, including 3735 Angstroms, which might be Al II lambda 3735, 3933 Angstroms (Ca II K), 3968 Angstroms (Ca II H), and 5893 Angstroms (Na I D, blended). We will also discuss several spectra obtained in the weeks following discovery as the supernova evolved. We hope to have fairly complete coverage of the day-to-day development of the spectra, and to correlate this with daily photometry of the supernova (Paik, et al. 1993, this meeting).
Filippenko Alexei V.
Matheson Thomas
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