Central Bureau for Astronomical Telegrams
IAUC 4065: PW Vul (N Vul 1984 No. 1); N Vul 1984 No. 2
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Circular No. 4065
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-495-7244/7440/7444
PW VULPECULAE (NOVA VULPECULAE 1984 No. 1)
R. D. Gehrz, G. L. Grasdalen and J. A. Hackwell, University
of Wyoming Infrared Observatory, report that infrared photometry
of this nova on May 14.4 UT suggests that dust grains have condensed
in the ejected shell. The observation date was ~ 285 days
after maximum light. Preliminary reduction gives infrared magnitudes
of [2.3 microns] = 9.9, [3.6 microns] = 8.4, [4.9 microns] = 7.6,
[8.7 microns] = 5.5, N = 5.3, [11.4 microns] = 5.2, Q >= 2.2. The dust
temperature is inferred to be ~ 700 K, suggesting that the dust shell may
have condensed before these observations were made. Wyoming photometry
of this nova by M. Greenhouse on Apr. 28.4 yielded magnitudes J =
11.0, H = 10.8, [2.3 microns] = 9.9, [3.6 microns] = 8.3.
NOVA VULPECULAE 1984 No. 2
R. D. Gehrz, G. L. Grasdalen and J. A. Hackwell, University
of Wyoming Infrared Observatory, write: "Infrared photometry and
spectrophotometry on May 14.4, 15.4 and 16.4 UT show that the
expanding shell of this nova is in a free-free development phase.
These observations were made ~ 150 days after the discovery date.
H(5->4) on May 16.4 has a peak flux of ~ 6 Jy and a velocity width
of ~ 5000 km/s. An intense 12.8-micron Ne II emission line (May 15.4)
stands a factor of ~ 50 above the continuum at a spectral resolution
of Delta-lambda/lambda ~ 0.015, has a velocity width of ~ 5000 km/s
and a peak intensity of ~ 60 Jy. Preliminary reduction for May 14.4
gives magnitudes of [2.3 microns] = 7.2, [3.6 microns] = 6.0, [4.9
microns] = 5.6, [8.7 microns] = 4.3, N = 2.6, [11.4 microns] = 3.2, [12.6
microns] =1.6, Q = 2.5. Wyoming photometry by M. Greenhouse on Apr. 28.4
yielded magnitudes J = 7.9, H = 8.0, [2.3 microns] = 7.2, [3.6 microns]
= 5.9."
H. Ogelman, Max-Planck Institut fur Extraterrestrische
Physik; and J. Krautter, Landessternwarte Konigstuhl, telex: "Nova
Vul 1984 No. 2 was observed with the EXOSAT satellite during Apr.
18.96-19.22 UT and detected at 3-sigma level with the low-energy (0.04-
2 keV) telescope. This observation constitutes the earliest x-ray
detection after outburst of a classical nova (3.7 months), thereby
indicating the timescale for the ejected shell to become transparent
to x-rays. We have also observed this object with the IUE
satellite on Apr. 29.1. The spectrum is dominated by emission
lines superposed on a strong continuum, and P-Cyg absorption
components exist with terminal velocities ~ 5000 km/s."
1985 May 23 (4065) Brian G. Marsden
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