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IAUC 7528: 2000er; CI Aql

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                                                  Circular No. 7528
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 2000er IN PGC 9132
     R. Chassagne, Ste. Clotilde, Ile de Reunion, reports his
discovery of an apparent supernova (mag 15.1) on CCD images taken
with an automated 0.30-m telescope on Nov. 23.83 and 24.78 UT.  SN
2000er is located at R.A. = 2h24m32s.54, Decl. = -58o26'18".0
(equinox 2000.0), which is 44" east and 16" south of the center of
PGC 9132.  Nothing appears at this position on an image taken by
Chassagne on Oct. 7.96 (limiting mag 18) or on the Digital Sky
Survey image taken on 1975 Sept. 9 (limiting mag 22).
     A. Maury, Observatoire de la Cote d'Azur, writes: "I. Hook, R.
Gorki, F. Selman, M. Dennefeld, and I took a spectrum (range 520-
900 nm) of SN 2000er with the 3.6-m telescope (+ EFOSC2) at the
European Southern Observatory (ESO).  The spectrum shows a very
blue continuum and the absence of a 615-nm trough; no other feature
is visible except a narrow P-Cyg profile at the rest wavelength of
He I 587.6-nm.  This suggests a possible type-Ib supernova, well
before maximum, but more observations with a bluer coverage are
needed.  The redshift was measured as 0.031."
     A. Clocchiatti, Pontificia Universidad Catolica; and M.
Turatto, Osservatorio di Padova, report:  "We have observed SN
2000er with the 3.6-m telescope (+ EFOSC2) at ESO on Nov. 26.17 UT.
The object looks very peculiar.  The preliminary reduction of a
spectrum (320-740nm, resolution 1.6 nm) shows a strong continuum
that can be fitted redward of 400 nm with a blackbody at 8000 K,
but rapidly drops blueward of this wavelength.  A large number of
narrow features are visible.  A narrow unresolved P-Cyg profile has
the emission centered at 607 nm and could be either Na I D or He I
587.6-nm.  The separation of the components corresponds to an
expansion velocity of about 800 km/s.  Very broad features are
possibly developing.  Estimated magnitudes for SN 2000er: V = 16.7,
B-V = +0.4, V-R = +0.2; at the distance of the parent galaxy, these
correspond to M_V = -19.1 (H_o = 65 km/Mpc/s)."

     K. Matsumoto and T. Kato, Kyoto University, report:  "R-band
CCD photometry using a 0.25-m telescope reveals that this recurrent
nova has apparently entered the final rapid-decline stage.  Nightly
averaged R_c magnitudes:  Nov. 19.378 UT, 13.01 +/- 0.05; 22.441,
13.68 +/- 0.28; 23.401, 15.13 +/- 0.61; 25.382, 14.48 +/- 0.28.
These observations correspond to the orbital phases of 0.60, 0.51,
0.05, and 0.27, respectively, based on our refined eclipse
ephemeris.  The deep fading on Nov. 23 reflects the primary eclipse."

                      (C) Copyright 2000 CBAT
2000 November 26               (7528)            Daniel W. E. Green

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