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IAUC 6968: 1998cv; 1998cw; CH Cyg

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                                                 Circular No. 6968
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)
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Phone 617-495-7244/7440/7444 (for emergency use only)


SUPERNOVA 1998cv IN ESO 237-G42
     J. Maza, Department of Astronomy, University of Chile, reports
the discovery of a supernova (B about 17.5) by Roberto Antezana on
a T-Max 400 film taken by L. E. Gonzalez using the Maksutov
telescope at Cerro El Roble on June 24.315 UT.  The supernova is
located at R.A. = 22h09m46s.29, Decl. = -49o47'43".0 (equinox
2000.0), which is 5".0 east and 12".7 north of the nucleus of the
spiral galaxy ESO 237-G42 (IRAS 22064-5003).  SN 1998cv is not
present on a film obtained with the same telescope on May 30.355 (B
> 20).  The object was confirmed spectroscopically by M. Phillips
at Cerro Tololo using the Blanco 4-m telescope on June 27; he
reports that this appears to be a type-Ic supernova relatively near
maximum.  The spectrum also shows narrow H-alpha emission at a
redshift (about 8150 km/s) consistent with that of the host galaxy.


SUPERNOVA 1998cw IN ANONYMOUS GALAXY
     Maza also reports that another supernova (B about 17.5) was
found by Antezana on a film taken as above on June 24.365 UT.  SN
1998cw is located at R.A. = 22h56m19s.67, Decl. = -35o09'59".9
(equinox 2000.0), which is on top of a small, faint galaxy (which
is smaller than 3" on the Digitized Sky Survey).  SN 1998cw is not
present on a film obtained with the same telescope on May 30.374 (B
> 20), but it was confirmed by Phillips with the the Blanco 4-m
telescope on June 27.  Phillips notes:  "This is a type-Ia
supernova, probably caught a few days before maximum.  The spectrum
resembles the pre-maximum spectrum of SN 1991T in showing strong Fe
III absorption lines.  However, the Ca II H and K and Si II
635.5-nm lines are also strong.  A 20-min spectrum of the faint
galaxy near this supernova does not show any obvious emission or
absorption features."


CH CYGNI
     J. Mikolajewska, Copernicus Astrnomical Center, Warsaw; R. J.
Ivison, Institute for Astronomy, Edinburgh; and R. Neri, IRAM, St.
Martin d'Heres, write:  "Continuum measurements with the IRAM
interferometer and with SCUBA on the James Clerk Maxwell Telescope
suggest that the symbiotic binary CH Cyg (cf. IAUC 6967) has
undergone a new radio outburst.  In May 1997 and Jan. 1998, the
1-3-mm spectrum was flat, with flux densities of 26 +/- 3 at 1 mm
and 23 +/- 2 mJy at 3 mm, while on May 18 we observed a steeply
rising continuum with flux densities of 39 +/- 6 at 2 mm and 90
+/- 7 mJy at 0.85 mm."

                      (C) Copyright 1998 CBAT
1998 July 9                    (6968)            Daniel W. E. Green

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