Central Bureau for Astronomical Telegrams
IAUC 3323: AO 0235+164; 4U 1538-52; SN IN NGC 4647
The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).
Read IAUC 3324
Circular No. 3323
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 617-864-5758
AO 0235+164
A. J. Pica, J. T. Pollock and A. G. Smith, Rosemary Hill Observatory,
University of Florida, communicate the following recent
UBVI photographic magnitude observations, derived using photoelectric
comparison sequences by McGinsey et al. (1976, Astron. J. 81,
750) and by Rieke et al. (1976, Nature 260, 754):
1978/79 UT B U V I
Dec. 31.10 18.26
Jan. 19.07 16.69
25.04 16.93 16.90 16.20 14.60
29.04 15.70 15.92 14.82 13.01
Feb. 1.12 15.40 15.77 14.61 12.91
They add that the rapid buildup and large amplitude of this flare
closely resemble the outburst of 1975 Nov. (IAUC 2867; Rieke et al.
loc. cit.) and are typical of the behavior of BL-Lac objects.
4U 1538-52
D. Crampton, Dominion Astrophysical Observatory, communicates
the following announcement by A. P. Cowley, J. B. Hutchings, C.
Chevalier, S. A. Ilovaisky, N. E. White and himself: "As a result
of confusion arising from Davison et al.'s (1977, Monthly Notices
Roy. Astron. Soc. 181, 73P) use of modified Julian date and the inaccuracy
of the period, the ephemerides given by Crampton et al.
(1978, Astrophys. J. 225, L63) and by Ilovaisky and Chevalier (I-C;
1979 Jan. Astron. Astrophys.) are in error. X-ray eclipse was observed
by HEAO A2 to occur on 1978 Feb. 24.87 +/- 0.25 UT. If this
is combined with the epochs given by Davison et al. and by I-C,
1976 Aug. 25.78 +/- 0.10 and 1978 May 10.49 +/- 0.05, a revised period
of 3.7288 +/- 0.0007 days is determined. We propose that this, combined
with the I-C epoch, be adopted. The phases given by Crampton
et al. should be corrected by -0.09, thereby reducing the apparent
orbital phase shift from the photometric ephemeris from +0.06 to
-0.03. No other significant changes occur in the I-C paper."
SUPERNOVA IN NGC 4647
T. A. Boroson and D. Turnshek, Steward Observatory, report
that observations on Jan. 30 indicate that this supernova (cf. IAUC
3322) is of type I and then about 30 days past maximum.
1979 February 5 (3323) Brian G. Marsden
Read IAUC 3324
Our Web policy. Index to the CBAT/MPC/ICQ pages.
