Central Bureau for Astronomical Telegrams
IAUC 5979: V1974 Cyg; 1994I; VY Aqr
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Circular No. 5979
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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
MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)
V1974 CYGNI
R. Gonzalez-Riestra and R. Monier, International Ultraviolet
Explorer (IUE), European Space Agency; J. Krautter, Landessternwarte,
Heidelberg; and M. A. J. Snijders, IRAM, on behalf of the European
Target of Opportunity Team for Novae, report: "IUE observations of
V1974 Cyg (Nova Cyg 1992) obtained on Apr. 7 show that this source
has experienced a substantial change since the previous observations
of Nov. 1993. In both cases, the observations were performed with
the short-wavelength camera (115-195 nm) in low-resolution (0.6-nm)
mode. Whereas the intensity of all the emission lines has decreased,
the continuum level has increased by factors 1.8 and 1.3 at 145 and
185 nm, respectively. The largest change is observed in the N V
124.0-nm line, intensity of which has decreased by nearly a factor
6 since last November (from 19.4 to 3.28 x 10E-13 erg cmE-2 sE-1),
suggesting a change in the ionizing radiation. The intensities of
lower-ionization lines have decreased by factors ranging from 2 to
4. The gas temperature seems to have experienced a noticeable
decrease. The line ratios N V 124.0-nm/N IV] 171.8-nm and N V
124.0-nm/N III] 175.0-nm have changed from 1.8 and 6.1 (Nov. 1993)
to 0.6 and 2.7 (Apr. 1994), respectively. Observations at other
wavelength ranges are urged in order to monitor what seems to be
the 'turn-off' of this nova."
SUPERNOVA 1994I IN NGC 5194
S. D. Van Dyk, University of California, Berkeley; K. W. Weiler,
Naval Research Laboratory; N. Panagia, Space Telescope Science
Institute; and M. P. Rupen and R. A. Sramek, National Radio Astronomy
Observatory, report: "New observations with the Very Large Array
in its highest-resolution (A) configuration have detected SN 1994I
for the first time at 20 cm, with flux densities of 0.55 +/- 0.18
mJy on Apr. 16.324 UT and 0.54 +/- 0.12 mJy on Apr. 17.321. The
uncertainties include both random and systematic (calibration)
errors; the rms noise in the two images was 0.11 and 0.10 mJy/beam,
respectively."
VY AQUARII
This object is in outburst for the first time in a year, as
indicated by the following visual magnitude estimates by A. F. Jones,
Nelson, New Zealand: Apr. 22.72 UT, [13; 23.715, 11.3; 23.751, 11.5.
1994 April 25 (5979) Daniel W. E. Green
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