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IAUC 7423: V1333 Aql; 2000cf; 2000ce

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IAUC number 

                                                  Circular No. 7423
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)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)


V1333 AQUILAE
     R. Jain, C. Bailyn, and P. Coppi, Yale University; M. Garcia,
Harvard-Smithsonian Center for Astrophysics; A. Levine,
Massachusetts Institute of Technology; J. Orosz, Utrecht University;
P. Lu, Western Connecticut State University; and J. Espinoza and D.
Gonzalez, Cerro Tololo Interamerican Observatory (CTIO), report
YALO consortium observations: "V1333 Aql = Aquila X-1 appears to be
beginning a new optical outburst.  This x-ray binary outbursts
approximately once per year, and last erupted in May 1999 (IAUC
7161).  We have been monitoring this source since Apr. 5 in R using
the YALO 1-m telescope at CTIO.  Compared to the quiescent average
magnitude, which fluctuates by < 0.1 mag, the source had brightened
in R by 0.16 +/- 0.02 mag on May 11.23 UT.  During May 12.23-12.40,
we obtained four observations that indicate an increase in
brightness of 0.27 to 0.34 +/- 0.02 mag compared to the quiescent
mean.  We will continue monitoring this source at optical,
infrared, and x-ray (using RXTE) wavelengths.  Observations at all
wavelengths are encouraged."


SUPERNOVA 2000cf IN MCG +11-19-25
     S. Jha, P. Challis, and R. Kirshner, Harvard-Smithsonian
Center for Astrophysics, report that a spectrum of SN 2000cf (cf.
IAUC 7421), taken by M. Calkins on May 11.33 UT with the F. L.
Whipple Observatory (FLWO) 1.5-m telescope (+ FAST spectrograph),
shows it to be a type-Ia supernova just past maximum light.  The
spectrum exhibits a blue continuum with broad Si II, S II, Mg II,
Fe II, and Ca II features.  Cross-correlation of the host-galaxy
spectrum with an emission-line template yields a recession velocity
of 10 920 +/- 20 km/s for MCG +11-19-25.  The supernova expansion
velocity, measured with the Si II (rest 635.5 nm) profile, is 9300
km/s.  The age of the supernova, based on its spectral features
(Riess et al. 1997, A.J. 114, 722), is 5 +/- 3 days after maximum
light.


SUPERNOVA 2000ce IN UGC 4195
     Corrigendum.  On IAUC 7422, line 8, for  (1591 km/s) yields
an expansion velocity for the supernova of 7600 km/s,  read  (4888
km/s) yields an expansion velocity for the supernova of 10 900 km/s,

                      (C) Copyright 2000 CBAT
2000 May 12                    (7423)            Daniel W. E. Green

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