J/A+AS/138/253 J/A+AS/138/253 Supernova light echoes F R Boffi W B Sparks F D Macchetto Astron. Astrophys. Suppl. Ser. 138 253 1999 1999A&AS..138..253B Photometry, UBVRI Supernovae distance scale scattering supernovae: general Supernova (SN) light echoes could be a powerful tool for determining distances to galaxies geometrically, Sparks (1994ApJ...433...19S). In this paper we present CCD photometry of the environments of 64 historical supernovae, the first results of a program designed to search for light echoes from these SNe. We commonly find patches of optical emission at, or close to, the sites of the supernovae. The color distribution of these patches is broad, and generally consistent with stellar population colors, possibly with some reddening. However there are in addition patches with both unusually red and unusually blue colors. We expect light echoes to be blue, and while none of the objects are quite as blue in V-R as the known light echo of SN 1991T, there are features that are unusually blue and we identify these as candidate light echoes for follow-on observations.

Galaxy Galaxy designation --- Run Run specification --- SN Supernova designation --- Type Supernova Type number=1 The SN Type was taken from Branch (1990, in "Supernovae", Petschek A.G. (ed.), Springer-Verlag, pp. 39-42) and/or from the Sternberg Catalog (Cat. <II/218/>; ':' after a Type indicates that according to the Sternberg Catalog there is uncertainty; both Types are classified spectroscopically, but the Type II are also classified according to the shape of the light curve (P=plateau; L=linear) as given by the Sternberg Catalog. This means that whenever a Type II is indicated as a Type IIP or IIL the Sternberg classification was used; for some objects only the Sternberg classification Type is found and is indicated in parenthesis; for SNe 1940E and 1963L the two sources disagree: both are given. --- Patch Patch designation number=2 We list all patches that have been identified at (or close to) the site of the supernova and that were bright enough to be detected during the observation: they are numbered and briefly described by a comment that follows. Such features are close to/within a ring of approximately 5 arcsec in radius centered at the nominal position of the supernova (see Figs. 1 through 36). --- n_Patch Patch description --- xpos Patch x offset arcsec n_xpos --- ypos Patch y offset arcsec n_ypos --- Bmag Magnitude at 4400A mag n_Bmag Comment on B magnitude number=3 $: IRAF program ``phot'' did not calculate the magnitude in some band and thus the color could not be derived #: no images were taken in that band s: saturated near the nucleus --- Vmag Magnitude at 5000A mag n_Vmag Comment on V magnitude --- Rmag Magnitude at 6400A mag n_Rmag Comment on R magnitude number=3 $: IRAF program ``phot'' did not calculate the magnitude in some band and thus the color could not be derived #: no images were taken in that band s: saturated near the nucleus --- B-V B-V colour index mag V-R B-V colour index mag Blim Limiting magnitude at 4400A number=4 The limiting magnitudes correspond to a 5{sigma} detection, unless a flag * indicates a 3{sigma} detection mag n_Blim Comment on B limiting magnitude number=4 The limiting magnitudes correspond to a 5{sigma} detection, unless a flag * indicates a 3{sigma} detection --- Vlim Limiting magnitude at 5000A number=4 The limiting magnitudes correspond to a 5{sigma} detection, unless a flag * indicates a 3{sigma} detection mag n_Vlim Comment on V limiting magnitude number=4 The limiting magnitudes correspond to a 5{sigma} detection, unless a flag * indicates a 3{sigma} detection --- Rlim Limiting magnitude at 6400A number=4 The limiting magnitudes correspond to a 5{sigma} detection, unless a flag * indicates a 3{sigma} detection mag n_Rlim Comment on R limiting magnitude number=4 The limiting magnitudes correspond to a 5{sigma} detection, unless a flag * indicates a 3{sigma} detection --- e_Bmag Standard deviation in B mag e_Vmag Standard deviation in V mag e_Rmag Standard deviation in R mag Patricia Bauer CDS 1999Jun10Francesca Boffi <boffi@stsci.edu> J_A+AS_138_253.xml