Central Bureau for Astronomical Telegrams
IAUC 7359: 2000E; 1987A
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Circular No. 7359
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)
SUPERNOVA 2000E IN NGC 6951
R. Evans, Yerkes Observatory, University of Chicago; and G.
Corso, De Paul University, report that Cousins R and I CCD images
taken on Jan. 24.03 UT with the 1-m Yerkes reflector show
prediscovery images of SN 2000E (cf. IAUC 7351). Absolute
photometry is not yet available, but preliminary analysis shows the
supernova to be 2.7 mag brighter than the star USNO A2.0
1500.07508662 in R and 1.0 mag brighter in I.
Regarding their item on IAUC 7353, V. F. Polcaro et al. revise
their information on the spectral features: "The spectra clearly
show a number of narrow absorption features, overlapping the usual
strong P-Cyg profiles typical of type-Ia supernovae. The stronger
features are at 627.8 and 684.8 +/- 0.3 nm, both with FWHM about
0.5 nm."
SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
S. Lawrence and A. Crotts, Columbia University, report
observations confirming the new second hotspot (IAUC 7354) in the
inner ring around SN 1987A: "Archival HST/STIS spectra taken on
1998 Nov. 14 show a spectral feature in H-alpha that is very
similar to that in the first hotspot, arising from an unresolved
source at radius 0".65 +/- 0".03 and p.a. 103 +/- 5 deg relative to
the supernova. Note that this is 0".15 interior to the radius of
maximum intensity radius of the ring. As might be expected from a
ring/ejecta interaction at this location, the spot was redshifted
by about 100 km/s versus the ring material, with a velocity width
of about 100 km/s FWHM. The H-alpha flux was about 1.5 x 10**-15
erg s**-1 cm**-2. No corresponding features are seen in forbidden
lines."
S. Maran, C. S. J. Pun, and G. Sonneborn, Goddard Space Flight
Center, NASA, write: "Broadband optical images (FWHM = 0".1)
obtained on Jan. 29 with the HST/STIS imaging mode (F28X50LP filter,
120-s exposure) confirm the recent brightening of a section of the
inner circumstellar ring (cf. IAUC 7354). We find that the
brightening is not confined to a single location, but is
distributed from p.a. 90 to 130 deg. This result was determined by
comparing the new images with images taken in 1998 November and
1999 February with the same instrumentation. We measure the
brightest location to be at a distance of 0".65 in p.a. 126 deg
with respect to the supernova. The net count rate from this
location, which appears as an unresolved source, is 3.1 +/- 0.4
counts/s above the adjacent ring material. The brightest position
is located near the inner edge of the ring, similar to the first
'hotspot' (cf. IAUC 6665, 6710, 6761, 7056)."
(C) Copyright 2000 CBAT
2000 February 7 (7359) Daniel W. E. Green
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