Central Bureau for Astronomical Telegrams
IAUC 7671: 2001de; V1333 Aql
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Circular No. 7671
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 2001de IN UGC 12089
T. Matheson, S. Jha, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum of SN
2001de (cf. IAUC 7664), obtained by P. Berlind on July 24.42 UT
with the Mt. Hopkins 1.5-m telescope (+ FAST spectrograph), shows
it to be a type-Ia supernova, about 1 week after maximum light.
Adopting the NED recession velocity of 9313 km/s for the host
galaxy, the supernova expansion velocity is about 10 600 km/s for
Si II (rest 635.5 nm). The spectral-feature age of the supernova
(Riess et al. 1997, A.J. 114, 722) is 6 +/- 2 days after maximum
light.
N. V. Borisov, A. N. Burenkov, V. V. Vlasuk, and A. G. Pramsky,
Special Astrophysical Observatory, report on their observations of
SN 2001de obtained with the 6-m telescope (+ long-slit spectrograph
+ CCD camera) on July 22.04 UT: "A full reduction of the CCD
spectrogram (range 360-810 nm, dispersion 0.24 nm/pixel) shows
that this object is indeed a supernova. The spectral features are
consistent with a peculiar type-Ia object. The usual Si II feature
(635.5 nm) is much less deep than in normal type-Ia supernovae, if
compared with all of the other spectral lines. The spectrum is
dominated by P-Cyg profiles, superimposed on a slightly blue
continuum. The most prominent features are identified as Ca II H
and K, Si II, Mg II, and S II. The expansion velocities measured
from the minima of Ca II H and K, Mg II 448.1-nm, and Si II
635.5-nm are 13 800, 11 400, and 11 000 km/s, respectively. The
recession velocity of the parent galaxy, deduced from the emission
peak of the Si II 635.5-nm line, is 9700 km/s."
V1333 AQUILAE
C. Bailyn, S. Tourtellotte, and L. Walkowicz, Yale University;
and D. Gonzalez and J. Espinoza, Cerro Tololo Interamerican
Observatory (CTIO), report that the current outburst of Aql X-1
reported on IAUC 7646 continues to show very unusual
characteristics: "We have continued daily R-band observations of
Aql X-1 (weather permitting) with the Yale 1-m telescope (+
ANDICAM) at CTIO. We find that, for the past several weeks, the
source has varied from 0.8 to 1.3 mag brighter than quiescence.
Since our measurements in both quiescence and outburst include
light from the near neighbor, V1333 Aql itself must be 2-3 mag
brighter than quiescence. During this time, the RXTE All Sky
Monitor shows x-ray flux levels of < 3 counts/s. Thus this
outburst is quite different from normal outbursts of this source,
which are accompanied by x-ray emission an order of magnitude
greater than has been observed during this outburst, and from
previously reported 'mini-outbursts', which last only a few days."
(C) Copyright 2001 CBAT
2001 July 25 (7671) Daniel W. E. Green
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