J/A+AS/138/253 Supernova light echoes (Boffi+, 1999)
A search for candidate light echoes: photometry of supernova environments
Boffi F.R., Sparks W.B., Macchetto F.D.
<Astron. Astrophys. Suppl. Ser. 138, 253 (1999)>
=1999A&AS..138..253B 1999A&AS..138..253B (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae ; Photometry, UBVRI
Keywords: scattering - supernovae: general - distance scale
Abstract:
Supernova (SN) light echoes could be a powerful tool for determining
distances to galaxies geometrically, Sparks (1994ApJ...433...19S 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.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2a.dat 131 48 JKT run photometry
table2b.dat 131 68 ESO run photometry
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Byte-by-byte Description of file: table2a.dat table2b.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Galaxy Galaxy designation
9 A1 --- Run ? Run specification
11- 15 A5 --- SN Supernova designation
17- 24 A8 --- Type Supernova Type (1)
27 I1 --- Patch ? Patch designation (2)
31- 43 A13 --- n_Patch ? Patch description
45- 49 F5.2 arcsec xpos ? Patch x offset
50 A1 --- n_xpos [EW]
52- 57 F6.3 arcsec ypos ? Patch y offset
58 A1 --- n_ypos [SN]
60- 64 F5.2 mag Bmag ? Magnitude at 4400A
65 A1 --- n_Bmag [$] Comment on B magnitude (3)
67- 71 F5.2 mag Vmag ? Magnitude at 5000A
72 A1 --- n_Vmag [$] Comment on V magnitude
73- 77 F5.2 mag Rmag ? Magnitude at 6400A
78 A1 --- n_Rmag [#s] Comment on R magnitude (3)
80- 84 F5.2 mag B-V ? B-V colour index
86- 90 F5.2 mag V-R ? B-V colour index
93- 97 F5.2 mag Blim ? Limiting magnitude at 4400A (4)
98 A1 --- n_Blim [*] Comment on B limiting magnitude (4)
100-104 F5.2 mag Vlim ? Limiting magnitude at 5000A (4)
105 A1 --- n_Vlim [*] Comment on V limiting magnitude (4)
107-111 F5.2 mag Rlim ? Limiting magnitude at 6400A (4)
112 A1 --- n_Rlim [*] Comment on R limiting magnitude (4)
114-117 F4.2 mag e_Bmag ? Standard deviation in B
120-123 F4.2 mag e_Vmag ? Standard deviation in V
126-129 F4.2 mag e_Rmag ? Standard deviation in R
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Note (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.
Note (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).
Note (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
Note (4): The limiting magnitudes correspond to a 5σ detection, unless
a flag * indicates a 3σ detection
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Acknowledgements: Francesca Boffi
(End) Patricia Bauer [CDS] 10-Jun-1999