Central Bureau for Astronomical Telegrams
IAUC 7825: 2002ao, 2002ap, 2002ar, 2002au, 2002av; NOVAE IN M31
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Circular No. 7825
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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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 2002ao, 2002ap, 2002ar, 2002au, 2002av
A. V. Filippenko and R. Chornock, University of California,
Berkeley, report that inspection of CCD spectra (range 330-1000
nm), obtained on Feb. 11 UT with the Shane 3-m reflector at Lick
Observatory, reveals that SN 2002ap (IAUC 7810) is very similar to
the peculiar type-Ic SN 1997ef ('hypernova'), about 2 weeks after
the explosion (Iwamoto et al. 2000, Ap.J. 534, 660, Fig. 1;
Matheson et al. 2001, A.J. 121, 1648, Fig. 18), as was suggested by
Kinugasa et al. (IAUC 7811). Broad emission emission features are
seen near 460 nm, 535 nm, and 645 nm. Absorption troughs nominally
associated with O I 777.4-nm and the Ca II triplet are visible near
755 nm and 810 nm, respectively; the expansion velocity derived
from the O I line is about 9000 km/s. SN 2002av (IAUC 7823) is of
type Ia near maximum brightness. SN 2002ar (IAUC 7819) is also of
type Ia, with a spectral-feature age of 1 +/- 2 days before maximum.
SN 2002au (IAUC 7823) is a supernova, probably (but not definitely)
of type Ia, about 1-2 weeks past maximum. SN 2002ao (IAUC 7809),
whose published classification is uncertain (IAUC 7810, 7815, 7819),
has a very unusual spectrum dominated by strong He I emission lines
with FWHM about 3000-4000 km/s. The corresponding hydrogen
emission is very weak, but broader lines of O I 777.4-nm (FWHM =
6000 km/s), the Ca II triplet, and Fe II are present. There is a
striking resemblance to the spectrum of SN 1999cq (Matheson et al.
2000, A.J. 119, 2303).
A. Riffeser, C. A. Goessl, and C. Ries, Institute of Astronomy
and Astrophysics, Munich, report CCD magnitudes for SN 2002ap: Feb.
1.8 UT, U = 13.48, B = 13.46, R = 12.88; 2.8, 13.35, 13.30, 12.79;
3.8, 13.29, 13.20, 12.65; 4.8, 13.26, 13.13, 12.54; 5.8, 13.34,
13.10, 12.42. A 300-s exposure taken on 1999 Sept. 9 shows no
progenitor to limiting mag R = 21.1 (3 sigma), confirming the report
by Vreeswijk et al. on IAUC 7820.
NOVAE IN M31
Filippenko and Chornock also write: "Inspection of CCD
spectra, obtained on Feb. 11 UT as above, reveals that the first
two nova candidates listed on IAUC 7794 are indeed novae, with
strong H_alpha emission. (The third candidate was not observed.)
The FWHM of H_alpha is about 3000 km/s in the first nova and 1500
km/s in the second nova, although in both cases the profile is
rather boxlike." It should be noted that, unlike the KAIT offsets,
the Padua east-west offsets given on IAUC 7794 did not include the
cosine-declination factor.
(C) Copyright 2002 CBAT
2002 February 11 (7825) Daniel W. E. Green
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