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IAUC 5953: 1994D; GQ Mus; 1982aa

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                                                  Circular No. 5953
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505

     R. J. Cumming, W. P. S. Meikle, and T. R. Geballe report: "Our
claimed detection of CO absorption in SN 1994D (cf. IAUC 5951),
based on preliminary data reduction by one of us (TRG), is incorrect.
More careful reduction (by TRG) of the data demonstrates that the
CO absorption is in the underlying galaxy.  The same re-reduction
reaffirms that the wide absorption feature centered at 1.052 microns
is intrinsic to the supernova.  In addition, weaker and resolved
(but less broad) absorption is apparent at 2.04 microns; this
feature is identified as He I 2.058 microns, and it provides strong
support for interpretation of the 1.052-micron feature as highly
blueshifted He I 1.083-micron absorption."
      Visual magnitude estimates:  Mar. 12.37 UT, 12.6 (R. Royer,
Lakewood, CA); 13.31, 12.3 (Royer); 14.30, 12.2 (Royer); 15.961,
12.1 (G. M. Hurst, Basingstoke, England); 16.94, 12.2 (G. Comello,
Groningen, The Netherlands); 17.399, 11.9 (W. G. Dillon, Missouri
City, TX).

     M. Hamuy and M. Phillips, Cerro Tololo Interamerican Observatory;
and R. Williams, Space Telescope Science Institute, report:  "The
optical spectrum of GQ Mus has changed significantly since the last
observation in 1992 Jan.  Consistent with reports that the x-ray
flux has suddenly declined during the past six months (J. Krautter,
private communication), the nova appears to be 'turning off'.  The
very strong line of [Fe X] 637.5-nm that had been present in the
spectrum for the past five years has now disappeared and has been
replaced by emission from [Fe VII] 608.7-nm.  A spectral scan (range
320-750 nm) obtained with the CTIO 4-m telescope on 1994 Feb. 7
shows that the optical continuum is unchanged, but the emission
lines are all substantially weaker and of lower ionization; e.g.,
[O III] 500.7-nm has once again appeared in the spectrum.  This
nova should continue to be monitored so that the 'nova turn-off'
can be documented."

SUPERNOVA 1982aa IN NGC 6052
     The presumed radio supernova in NGC 6052 = Markarian 297 at
R.A. = 16h03m00s.99, Decl. = +20o40'43".6 (equinox 1950.0; see
Heeschen et al. 1983, Ap.J. 267, L73; IAUC 5276; Yin and Heeschen
1991, Nature 354, 130; Yin 1994, Ap.J. 420, 152) has been given the
designation 1982aa.

1994 March 17                  (5953)            Daniel W. E. Green

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