Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 7423: V1333 Aql; 2000cf; 2000ce

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).

Read IAUC 7422  SEARCH Read IAUC 7424

View IAUC 7423 in .dvi or .ps format.
IAUC number

                                                  Circular No. 7423
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)

     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

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

Read IAUC 7422  SEARCH Read IAUC 7424

View IAUC 7423 in .dvi or .ps format.

Our Web policy. Index to the CBAT/MPC/ICQ pages.

Valid HTML 4.01!