Central Bureau for Astronomical Telegrams
IAUC 4070: 1985J; V1341 Cyg; 1984e; OJ 287
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Read IAUC 4071
Circular No. 4070
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
SUPERNOVA 1985J
R. Kirshner and M. Newbury, University of Michigan, report
that spectrograms obtained at the McGraw-Hill Observatory on May 25
show this object with a relatively featureless spectrum. The
spectrum indicates a magnitude at 500 nm of ~ 17. The rapid drop in
brightness (cf. IAUC 4059, 4066) is atypical of a supernova, and
suggests that this may be a cataclysmic variable.
V1341 CYGNI
G. Hasinger, A. Langmeier, and M. Sztajno, Max-Planck-Institut
fur Extraterrestrische Physik, Garching; and N. White, EXOSAT
Observatory, telex: "EXOSAT 1-to-10-keV observations of V1341 Cyg (=
Cyg X-2 = 4U 2142+380) made between 1984 July 7.100 and 7.683 UT,
with 7.8-ms time resolution, exhibit intensity-dependent
quasiperiodic oscillations in the frequency range 30-50 Hz. The
centroid frequency, f, of a broad (FWHM = 50 percent) bump in the power
spectrum (16 sigma) shifts to higher frequencies when the source
intensity, I, increases from 1 to 1.4 cts/s/cm**2 with (d log f)/dI =
1.7 +/- 0.3. The integrated excess power is on the order of 5
percent. We also find low-frequency noise (0-15 Hz), and its total
power increases from 5.0 to 6.8 percent during intensity increases.
The source spectra also show significant changes correlated with
intensity. These phenomena are similar to the ones reported
previously for GX 5-1 by van der Klis et al. (IAUC 4043) and for V818
Sco = Sco X-1 by Middleditch and Priedhorsky (IAUC 4060) and van
der Klis et al. (IAUC 4068)."
PERIODIC COMET GIACOBINI-ZINNER (1984e)
Total visual magnitude estimates: May 18.35 UT, 13.4 (C. S.
Morris, 0.61-m reflector, Table Mountain Observatory); May 26.51,
13.2 (A. Hale and C. S. Morris, 0.20-m reflector, Big Bear, CA).
OJ 287
Visual magnitude estimates by M. Verdenet, Bourbon-Lancy,
France: Mar. 14.9 UT, 15.3; 20.9, 15.4; 21.9, 15.5; 24.9, 15.3;
Apr. 17.9, 14.8; 18.9, 14.7; 19.9, 14.5; 20.9, 14.3.
1985 May 31 (4070) Daniel W. E. Green
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