Central Bureau for Astronomical Telegrams
IAUC 7954: 2002el; 2002dz
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Circular No. 7954
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 2002el IN NGC 6986
L. Wang, Lawrence Berkeley National Laboratory (LBNL), writes
that preliminary reduction of spectropolarimetry (range 333-860 nm;
spectral resolution 1.27 nm) of SN 2002el (cf. IAUC 7953), obtained
with the European Southern Observatory's Very Large Telescope UT3
(+ FORS1) on Oct. 14, shows it to be a type-Ia supernova around
optical maximum with < 0.2 percent of intrinsic polarization.
F. Patat, European Southern Observatory; and P. Meikle,
Imperial College, London, on behalf of the European Research and
Training Network on the Physics of Type-Ia Supernovae, report that
spectrograms (ranges 390-500 and 600-710 nm; resolution 0.17 nm) of
SN 2002el were obtained at Calar Alto Observatory by J. Aceituno on
Aug. 14.97 UT at the 3.5-m telescope (+ TWIN double-channel
spectrograph). A full reduction of the two 1800-s spectra shows
the object to be a type-Ia supernova. A comparison with the
spectra of SN 1994D (Patat et al. 1996, MNRAS 278, 111) indicates
that SN 2002el was observed 8-10 days before maximum light. The
recession velocity of the parent galaxy, deduced from the match to
the spectra of SN 1994D, is 9000 +/- 1000 km/s.
W. M. Wood-Vasey, University of California at Berkeley (UCB)
and LBNL, reports that prediscovery NEAT observations of SN 2002el,
taken with the Oschin 1.2-m telescope at Palomar Observatory on
Aug. 8.29, 8.31, and 8.36 UT, clearly show the new object at
unfiltered mag 19.5. Images taken with the same telescope on July
17.30 and 17.87 show nothing at this position (limiting mag 20.5).
SUPERNOVA 2002dz IN MCG -01-1-52
A. V. Filippenko, R. J. Foley, M. Papenkova, and B. Swift,
UCB, report that inspection of CCD spectra (range 310-1000 nm),
obtained on Aug. 10 UT with the Shane 3-m reflector at Lick
Observatory, reveals that SN 2002dz (IAUC 7935) is of type Ib or
Ic, well into the nebular phase. Strong, broad emission lines of
[O I], [Ca II], and Ca II (near-infrared triplet) are present, with
no evidence for broad H-alpha. The [O I] and [Ca II] line widths
(FWHM about 5400 km/s) are smaller than average for nebular type-Ic
supernovae (Matheson et al. 2001, A.J. 121, 1648), perhaps
suggesting that the object is actually of type Ib, with more
massive ejecta than are present with typical type-Ic supernovae.
(C) Copyright 2002 CBAT
2002 August 15 (7954) Daniel W. E. Green
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