Central Bureau for Astronomical Telegrams
IAUC 4085: V794 Aql AND IP Peg; V1329 Cyg; 1984e
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Circular No. 4085
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
V794 AQUILAE AND IP PEGASI
R. K. Honeycutt and E. M. Schlegel, Indiana University,
communicate: "V794 Aql has varied erratically between mag 14 and 17
for 50 years. In 1980 Szkody et al. (1981, Ap.J. 249, L61) found
wide (5.0-7.5 nm) emission lines characteristic of a cataclysmic
variable. Using the intensified image-dissector-scanner (I-IDS)
on the Kitt Peak 2.1-m telescope, we found V794 Aql at B = 20.2 on
June 26, 27 and 29. The spectrum showed only very narrow (0.5 nm)
Balmer emission lines. This low-state behavior is similar to, but
more extreme than, that of MV Lyr. IP Peg is a new (IBVS 2653),
high-inclination dwarf nova. Time-resolved spectrophotometry in
the blue, using the I-IDS on the Kitt Peak 2.1-m telescope on June
26, 27, 28 and 29, shows a low-excitation spectrum with widely-
spaced (1000 km/s) disk components. We see no S-wave, in spite of
a very strong hump in the light curve preceding eclipse.
Emission-line amplitude is ~ 150 km/s, with no evidence of a secondary
spectrum. All emission lines have a strong rotational disturbance
during the deep eclipse."
V1329 CYGNI
This object, generally in the magnitude range 12.5-13.8, has
recently been bright: July 5.3 UT, 11.8 (R. Ducoty, Capitola, CA);
7.9, 12.0 (M. Verdenet, Bourbon-Lancy, France); 8.9, 12.0 (Ducoty);
17.2, 11.8 (Ducoty); 18.3, 12.5 (Ducoty); 19.3, 12.9 (Ducoty).
PERIODIC COMET GIACOBINI-ZINNER (1984e)
R. R. Joyce and J. C. Echohawk report the infrared magnitudes,
obtained with the 1.3-m telescope at Kitt Peak National Observatory
using an 11" aperture: June 25.434 UT, J = 12.21 +/- 0.03,
H = 11.81 +/- 0.03, K = 11.63 +/- 0.03; June 26.444, N = 2.85 +/- 0.04.
Total visual magnitude estimates: June 11.15 UT, 11.2 (J. E.
Bortle, Stormville, NY, 0.32-m reflector); 15.16, 11.2 (Bortle);
20.95, 11.5 (M. V. Zanotta, near Como, Italy, 0.30-m reflector);
24.98, 11.3 (Zanotta); 30.56, 10.5 (T. Seki, Geisei, 0.20-m
reflector); July 6.92, 10.5 (J.-C. Merlin, Le Creusot, France, 0.40-m
reflector); 8.24, 10.2 (C. S. Morris, near Mt. Wilson, CA; tail 2'
in p.a. 225; on IAUC 4066 the tail length should have been 1'0);
12.22, 10.0 (Bortle; tail 4' long in p.a. 240); 17.26, 9.4 (
Morris); 21.28, 8.9 (C. Spratt, Victoria, BC, 0.25-m reflector).
1985 July 23 (4085) Brian G. Marsden
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