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IAUC 7417: 2000ce; Var STAR IN NGC 3432; CI Aql

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IAUC number

                                                  Circular No. 7417
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)

SUPERNOVA 2000ce IN UGC 4195
     T. Puckett, Mountain Town, GA, reports his discovery of an
apparent supernova (mag 15.0) on an unfiltered CCD frame (limiting
mag 19.3) taken with the Puckett Observatory 0.35-m automated
supernova patrol telescope on May 8.13 UT.  SN 2000ce is located at
R.A. = 8h05m09s.45, Decl. = +66o47'15".2 (equinox 2000.0), which is
15".1 east and 17".3 north of the center of UGC 4195.  The new
object was also present on an unfiltered CCD frame taken on May
9.05, but it was not present on a frame taken on Mar. 23.23 or on
Palomar Sky Survey images taken on 1997 Feb. 5 (limiting mag about
21.0) or 1955 Jan. 29 (limiting mag about 20.0).

     R. M. Wagner, Ohio State University; G. D. Schmidt, P. Smith,
and D. Hines, Steward Observatory; and S. G. Starrfield, Arizona
State University, report:  "We obtained a spectrum (resolution 1.3
nm; range 432-740 nm) of the variable star in the field of NGC 3432
(cf. IAUC 7415) on May 6.2 UT with the Steward Observatory CCD
SpectroPolarimeter attached to the Bok 2.3-m telescope at Kitt
Peak.  The spectrum exhibits relatively strong Balmer emission
lines of H-alpha (equivalent width = 34.4 nm, FWHM = 1677 km/s) and
H-beta (EW = 12.8 nm, FWHM = 2132 km/s) superposed on a smooth
continuum.  No other species are detected.  The centroid of these
emission lines yields a redshift of about 0.002.  This is
consistent with the catalogued redshift of NGC 3432 (0.0020),
indicating that the new variable is located in this galaxy and is
not a foreground or background object.  The spectral features
resemble that of a classical nova observed in its early decline
phase with an expansion velocity of about 950 km/s.  The V
continuum magnitude inferred from our spectrum is 19.1 +/- 0.3.  If
this variable reached an apparent magnitude at maximum of 17-18,
then at the distance of NGC 3432, it would imply an absolute visual
magnitude of at least -12, compared with the mean absolute
magnitude of Galactic and M31 novae at maximum of about -8.  If
this were a classical nova, then the peak bolometric magnitude,
which implies a luminosity exceeding 10**6 that of the sun, is
inconsistent with the low expansion velocity that we measure."

     W. Liller, Vina del Mar, Chile, reports that nothing is
present at the position of CI Aql on 217 orange-red photographs
(limiting mag typically about 11.0) taken from Oct. 1983 to 2000
Apr. 4.333 UT.

                      (C) Copyright 2000 CBAT
2000 May 9                     (7417)            Daniel W. E. Green

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