Central Bureau for Astronomical Telegrams
IAUC 4796: WX Cet; V404 Cyg; 1987A
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Circular No. 4796
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 or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
WX CETI
B. Margon, University of Washington; P. Hill, University
Observatory, St. Andrews; and S. Heathcote, R. Venegas, M. Hamuy,
and R. Williams, Cerro Tololo Interamerican Observatory, report:
"Spectra of WX Cet in outburst, obtained at the Anglo-Australian
Telescope on June 7 UT and the CTIO 1-m on June 11, show broad,
shallow Balmer absorption, together with a complex pattern of
unidentified weak absorption and narrow emission in the blue
that is clearly changing substantially on a timescale of days.
Further spectroscopic monitoring is urged."
V404 CYGNI
R. M. Hjellming, National Radio Astronomy Observatory; and
X.-H. Han, NRAO and Beijing Observatory, report: "Continued Very
Large Array observations of V404 Cyg have shown that, since the
initial observations on May 30 and June 1 reported on IAUC 4790,
the radio source fluctuated between 0.05 and 0.15 Jy with
systematic variations at all frequencies by amounts varying from
20 to 100 percent on timescales of hours. The radio source has
not decayed like an x-ray nova and shows radio spectra and
variability analogous to what has been seen for V1343 Aql (SS 433)
and V1357 Cyg (Cygnus X-1). Multi-frequency radio observations for
long, continuous periods would be most valuable, since long periods
of observation that might cover complete 'cycles' are difficult
to obtain with the VLA for targets of opportunity."
SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
H. Moseley, E. Dwek, W. Glaccum, J. Graham, R. Loewenstein,
and R. Silverberg, Goddard Space Flight Center, NASA, report the
results of far-infrared spectrophotometry of SN 1987A obtained on
Mar. 31 and Apr. 2 using the Kuiper Airborne Observatory: "The
observations cover the spectral range 16-30 microns, with spectral
resolving power about 40. The spectrum shows a quite flat continuum
that may rise slightly from 16 to 28 microns, with emission lines
from the ground state (26.0 microns) and one excited state (17.9
microns) of [Fe II]. The continuum is 4-5 Jy, about a factor of
2-2.5 weaker than in our Nov. 1988 measurements, while the [Fe II]
lines have declined by less than a factor of two. No significant
emission was detected from the ground-state fine-structure line of
[Fe I] at 24.05 microns."
1989 June 13 (4796) Daniel W. E. Green
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