Abstract

We present optical photometry of one Type IIn supernova (1994Y) and nine Type Ia supernovae (1993Y, 1993Z, 1993ae, 1994B, 1994C, 1994M, 1994Q, 1994ae, and 1995D). SN 1993Y and SN 1993Z appear to be normal SN Ia events with similar rates of decline, but we do not have data near maximum brightness. The colors of SN 1994C suggest that it suffers from significant reddening or is intrinsically red. The light curves of SN 1994Y are complicated; they show a slow rise and gradual decline near maximum brightness in V RI and numerous changes in the decline rates at later times. SN 1994Y also demonstrates color evolution similar to that of the SN IIn 1988Z, but it is slightly more luminous and declines more rapidly than SN 1988Z. The behavior of SN 1994Y indicates a small ejecta mass and a gradual strengthening of the Hα emission relative to the continuum. Subject headings: supernovae: general – supernovae: individual (1993Y, 1993Z, 1993ae, 1994B, 1994C, 1994M, 1994Q, 1994Y, 1994ae, 1995D) Also associated with Space Sciences Laboratory, and Department of Physics, University of California, Berkeley. Current address: Department of Astronomy, Cornell University, Ithaca, NY 14853; e-mail wynnho@astro.cornell.edu. Current address: IPAC, 100-22 Caltech, Pasadena, CA 91125; e-mail vandyk@ipac.caltech.edu. Current address: Steward Observatory, University of Arizona, Tucson, AZ 85721; e-mail cyp@as.arizona.edu. E-mail alex@astro.berkeley.edu. Current address: Department of Astronomy, University of Massachusetts, Amherst, MA 01003-9305; e-mail leonard@nova.astro.umass.edu. Current address: Harvard/Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138; e-mail tmatheso@cfa.harvard.edu. E-mail treffers@pacbell.net. E-mail mwrsps@rit.edu.

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