Optical Spectra of SN 1993J During the First Week

Details Optical Spectra of SN 1993J During the First Week Optical Spectra of SN 1993J During the First Week

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.3901f&link_type=abstract

American Astronomical Society, 183rd AAS Meeting, #39.01; Bulletin of the American Astronomical Society, Vol. 25, p.1348

Astronomy and Astrophysics

Astronomy

Scientific paper

Optical spectra of SN1993J in M81 are presented for each night from March 31.1 1993 UT to April 7.1 1993 UT with wavelength coverage from 4400 Angstroms to 8200 Angstroms at 4 Angstroms resolution. Emission features near 4950, 5860, and 6560 Angstroms begin to appear on March 31.1 and continue to rise throughout the first week. Faint emission near 6370 Angstroms, probably due to [Fe X] 6374 Angstroms, is detected on April 1.1 and fades by April 2.2. This fading suggests a radius of 0.001 pc for the [Fe X] emitting region, assuming a SN expansion velocity of 10,000 km s(-1) . The Hα feature at 6560 Angstroms extends from 6350 to 6800 Angstroms corresponding to velocities of +/- 10,000 km s(-1) . A slight dip centered at 6516 Angstroms is seen on the Hα emission peak beginning April 2.2, and grows deeper through the first week. If the feature at 5860 Angstroms is due to He I 5876 Angstroms, the corresponding Doppler width is +/- 12,000 km s(-1) . Possible absorption features blueward of Hα and He I appear on April 3.1, as well as emission near 5100 Angstroms. On April 4.1 the feature at 4950 Angstroms resolves into two peaks at 4797 and 4909 Angstroms, which we attribute to blueshifted Fe II 4924, 5018 Angstroms lines. On April 5.1, the emission at 5100 Angstroms can be resolved into two peaks centered at 5073 Angstroms and 5226 Angstroms. Discussion of these data will be presented.

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