BVRI photometry of SN 1993J in M81. 1: Period April 01-30 1993

Details BVRI photometry of SN 1993J in M81. 1: Period April 01-30 1993 BVRI photometry of SN 1993J in M81. 1: Period April 01-30 1993

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasj...45l..59v&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 45, no. 5, p. L59-L62

Astronomy and Astrophysics

Astronomy

13

Astronomical Photometry, Light Curve, Stellar Magnitude, Supernovae, Charge Coupled Devices, Color-Magnitude Diagram, Schmidt Telescopes

Scientific paper

We present BVRI photometry of supernova SN 1993J in Messier 81 for the period of April 01-30 1993 obtained with the 105-cm Schmidt telescope of Kiso Observatory. The magnitudes were determined through a comparison with two nearby reference stars. The estimated accuracy of the data is +/- 0.02 mag. We also present an R-band pre-discovery image taken on March 25.6 (UT), 2.7 d before the first detection, from which we derive a (conservative) upper limit of 18.5 for SN 1993J. The supernova's light curve is unique, as it shows neither a typical plateau nor a linear decline, which suggests that it constitutes a new subclass of Type II supernova and that its progenitor was not a typical red supergiant.

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