Central Bureau for Astronomical Telegrams
IAUC 8602: 2005eb and 2005ec; V838 Mon
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Circular No. 8602
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)
SUPERNOVAE 2005eb and 2005ec
Further to IAUC 8598, N. Ponticello and W. Li report the
LOSS/KAIT discovery of an apparent supernova (designated 2005eb) on
unfiltered KAIT images taken on Sept. 7.33 (at mag 18.4) and 16.33
UT (mag 18.8) and located at R.A. = 0h54m50s.94, Decl. =
+29o14'46".8 (equinox 2000.0), which is 9".0 east and 2".4 south of
the center of UGC 556. Nothing was visible at this location on a
KAIT image taken on Aug. 27.32 (limiting mag 19.5).
Ponticello and Li also report the LOSS/KAIT discovery of
another supernova (designated 2005ec) on unfiltered KAIT images
taken on Sept. 16.54 (at mag 16.8) and 17.54 UT (mag 16.6) and
located at R.A. = 4h54m19s.17, Decl. = +1o38'27".6 (equinox
2000.0), which is 1".3 west and 2".5 north of the center of NGC
1690. Nothing was visible at this location on a KAIT image taken
on Jan. 11.13 (limiting mag 19.0).
The "Nearby Supernova Factory" group (G. Aldering et al.; cf.
CBET 230) reports that a spectrum (range 320-1000 nm) of SN 2005ec,
obtained on Sept. 21.6 UT with the Supernova Integral Field
Spectrograph on the University of Hawaii 2.2-m telescope, shows it
to be a type-Ia supernova at an age of two weeks after maximum and
at a redshift of z = 0.03, in agreement with the host redshift (NGC
1690; Ostriker et al. 1988, A.J. 96, 1775). The spectrum is
similar to that of SN 1994D at this phase, shifted to the host's
redshift.
V838 MONOCEROTIS
M. Claussen, National Radio Astronomy Observatory (NRAO); K.
Healy and S. Starrfield, Arizona State University; and H. E. Bond,
Space Telescope Science Institute, report SiO maser observations of
the unusual eruptive variable V838 Mon using the NRAO Very Large
Array on Sept. 1: "SiO maser emission was first detected by
Deguchi et al. (2005, http://xxx.lanl.gov/abs/astro-ph/?0507363) on
2005 Feb. 23, strengthening by Apr. 24. Relative to the April
observations, we find that the peak flux in the v=2, J=1-0 SiO
transition at 42.82 GHz has increased further by a factor of four
to 4.98 +/- 0.01 Jy. The peak flux in the v=1, J=1-0 transition at
43.12 GHz has also strengthened by a factor of three to 2.83 +/-
0.01 Jy. The maser emission in both transitions is unresolved
(angular size < 0".3). Further monitoring with the VLA and the
Very Long Baseline Array is planned, and monitoring is encouraged
at other wavelengths, especially in the near- and mid-infrared."
(C) Copyright 2005 CBAT
2005 September 21 (8602) Daniel W. E. Green
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