Central Bureau for Astronomical Telegrams
IAUC 7272: 1999ee; NOVAE IN M31
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Circular No. 7272
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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Phone 617-495-7244/7440/7444 (for emergency use only)
SUPERNOVA 1999ee IN IC 5179
J. Maza, University of Chile; and M. Hamuy, University of
Arizona, report the discovery by M. Wischnjewsky, on a 20-min
unfiltered T-Max 400 film taken by L. Gonzalez on Oct. 7.15 UT with
the University of Chile's Maksutov telescope, of a supernova (m_pv
about 17.5) located at R.A. = 22h16m09s.40, Decl. = -36o50'31".5
(equinox 2000.0), which is about 10" east and 10" south of the
nucleus of IC 5179. The supernova was confirmed by P. Candia from
B,V,I images taken with the Cerro Tololo 0.9-m telescope on Oct.
8.12. Maza obtained a spectrum (range 320-800 nm; resolution 0.4
nm) of SN 1999ee on Oct. 9.10 using the 4-m Blanco telescope at
Cerro Tololo, which reveals that the supernova is a type-Ia event
with the characteristic Si II 635.5-nm line having an expansion
velocity of 15 700 km/s. The spectrum has a blue continuum,
indicating the supernova to be several days before maximum. Hamuy
and C. Lidman obtained a spectrum (range 1000-2200 nm; resolution
about 500, S/N about 7) on Oct. 9.10, at the European Southern
Observatory with the Very Large Telescope (+ ISAAC), which shows a
featureless continuum. At the redshift of the host galaxy (3447
km/s), a type-Ia supernova could reach a peak V magnitude near =
14.5.
NOVAE IN M31
A. V. Filippenko, R. T. Chornock, A. L. Coil, D. C. Leonard,
and W. D. Li, University of California at Berkeley, write that CCD
spectra (range 420-700 nm) obtained on Sept. 10 and 17 UT with the
3-m Shane reflector at Lick Observatory confirm the novae in M31
reported on IAUC 7218 and 7249, respectively. Prominent hydrogen
Balmer emission lines are visible, with weaker Fe II emission.
Li, on behalf of the Lick Observatory Supernova Search (cf.
IAUC 6627, 7126) also reports the discovery, with the 0.8-m Katzman
Automatic Imaging Telescope (KAIT) on unfiltered images taken on
Oct. 3.2 and 4.2 UT, of another nova (mag about 17.5) in M31. An
image taken on Oct. 2.2 also showed a hint of the nova. The
magnitude estimate (about 17.5) is rough because of the nova's
proximity to the bright nucleus of M31. The new object is located
at R.A. = 0h42m49s.7, Decl. = +41o16'32" (equinox 2000.0), which is
about 61" east and 24" north of the nucleus of M31. A KAIT image
of M31 on Oct. 1.2 (limiting mag about 19.0) showed nothing at the
position of the nova. Filippenko and Chornock report that a noisy
CCD spectrum (range 420-700 nm), obtained on Oct. 8 with the 3-m
Shane reflector, confirms the nova; hydrogen Balmer emission lines
are present.
(C) Copyright 1999 CBAT
1999 October 9 (7272) Daniel W. E. Green
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