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IAUC 4188: SW UMa; AR Pup; 1982i

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IAUC number 

                                                  Circular No. 4188
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


SW URSAE MAJORIS
     This dwarf nova is undergoing a bright outburst, its first
since 1981 Dec.  Selected visual magnitude estimates, communicated
by J. A. Mattei, AAVSO, and by G. M. Hurst, Basingstoke, England:
Mar. 1.81 UT, [13.9 (S. Lubbock, Bridge End, England); 2.04, 12.9
(R. Ariail, Columbia, SC); 2.13, 12.3 (G. Chaple, Townsend, MA);
2.18, 11.1 (C. Scovil, Stamford, CT); 2.90, 10.3 (Hurst); 2.98,
10.6 (G. Dyck, N. Dartmouth, MA); 3.22, 9.3 (R. Ducoty, Capitola,
CA); 4.17, 9.2 (Ducoty); 4.19, 9.9 (Ariail).  Mattei notes that the
outbursts (supermaxima?) generally last 10-15 days, and that high-
speed photometry is strongly recommended in search of superhumps.


AR PUPPIS
     N. K. Rao, Indian Institute of Astrophysics, reports:  "The
RV-Tau star AR Pup showed a dramatic change in linear polarization
within a period of 6 days.  Observations made by A. V. Raveendran,
N. K. Rao, M. J. Rozario, U. C. Joshi, amd A. K. Kulasrestha with
the 1-m reflector in Kavalur gave the following polarization (in
percent and for the filters U, B, V, R):  Feb. 9.8 UT, 9.9, 8.7,
7.1, 6.2; Feb. 16.7, 14.6, 12.2, 9.5, 8.3.  The position angle lies
between 92-105.  The errors are 0.3 in U and 0.1 in other bands."


PERIODIC COMET HALLEY (1982i)
     Corrigenda.  The magnitudes reported by Gehrz on IAUC 4179
should read as follows: all of the [2.3 microns] and [3.6 microns] data are
positive values; the Jan. [4.9 microns] data are positive, and the Feb.
[4.9 microns] data are negative values; and all of the remaining
magnitudes should have negative signs.

     P. Schloerb, W. Kinzel, D. Swade, and W. Irvine report further
detections of the J=(1,0), F=(2-1) HCN line with the Five College
Radio Astronomy Observatory's 14-m antenna: "Following our previous
report (IAUC 4176), we have made detections on Feb. 12.7 and
26.6 UT at an antenna temperature of 40 +/- 10 mK (corrected to
outside of Earth's atmosphere).  No detections were made on Feb. 10.6,
11.6, 13.7, 14.8, 27.6, 28.6, and Mar. 1.6.  Apparently the emission
is quite variable and we note that the detection on Feb. 12.7
occurs close in time to an infrared outburst reported by Ney and
Knutson (IAUC 4178) and event number 7 of Sekanina's analysis (IAUC
4187) of the dust tail."


1986 March 4                   (4188)            Daniel W. E. Green

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