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IAUC 3604: N CrA 1981; PU Vul; P/SCHWASSMANN-WACHMANN 1

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                                                  Circular No. 3604
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


NOVA CORONAE AUSTRINAE 1981
     F. J. Vrba, U.S. Naval Observatory, Flagstaff, and A. E.
Rydgren, Rensselaer Polytechnic Institute, write: "The following
nearly-simultaneous photometry of Nova CrA was obtained on Apr.
27.4 UT, 25 days after outburst, at Cerro Tololo Interamerican
Observatory:  V = 10.57 +/- 0.07, B-V = -0.65 +/- 0.02, U-B = -1.07 +/-
0.02,  V-r = +0.92 +/- 0.02, V-i = +0.57 +/- 0.02, K = 8.99 +/- 0.03, J-H
= 0.00 +/- 0.04, H-K = +0.59 +/- 0.03, K-L= +0.72 +/- 0.05 (r and i are
filters of the Kunkel-Rydgren system).  These observations show extreme
U and B excesses and a smaller excess at r.  Otherwise, the
entire energy distribution resembles that of a 5700 K blackbody;
this is consistent with an underlying G2 star without detectable
infrared emission from a dust component.  Its relative brightness
and slow development prompt us to urge further observations, especially
in the infrared, to monitor this nova during the course of
its likely-dust-shell evolution."
     P. Whitelock, South African Astronomical Observatory, telexes
that she and M. W. Feast observed a strong emission at 1280 nm from
Nova CrA on Apr. 30.16 UT, using a circular variable filter with a
resolving power of 100 and equivalent width ~ 70 nm; this emission
is probably a Paschen line due to P-beta.


PU VULPECULAE
     A. Purgathofer and A. Schnell, Institute for Astronomy, University
of Vienna, report the following photoelectric data obtained at
the Figl Observatory using SAO 88548 as a comparison star: May 8.07
UT, V = 9.80, B-V = +0.80, U-B = +0.50; 10.04, V = 9.69, B-V =
+0.81, U-B = +0.47.  These data and the observations on IAUC 3589
suggest an increase in brightness for this object which is several
times more rapid than that observed during the previous outburst in
1978-79.


PERIODIC COMET SCHWASSMANN-WACHMANN 1
     Recent visual total magnitude estimates: Apr. 23.88 UT, 11.2
(G. Keitch, Wrington, England, 0.30-m reflector); May 1.06, 11.5 (J.
E. Bortle, Stormville, NY, 0.32-m reflector); 4.08, 11.4 (Bortle);
7.21, 12.5 (A. Hale, San Diego, CA, 0.20-m reflector); 8.07, 11.5
(Bortle).


1981 May 18                    (3604)              Daniel W. E. Green

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