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IAUC 3687: 3A 0729+103; SY Mus; P/SCHWASSMANN-WACHMANN 1

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IAUC number 

                                                  Circular No. 3687
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


3A 0729+103
     I. M. McHardy and J. P. Pye, University of Leicester; A. P.
Fairall, B. Warner, S. Allen and M. Cropper, University of Cape
Town; and M. J. Ward, Institute of Astronomy, Cambridge, report the
identification of the x-ray source 3A 0729+103 with a newly
discovered catac1ysmic variable of mag ~14.5, based on an
arcmin-precision position obtained from an Einstein IPC guest observation.
Extensive photometry in white light with 10-s time resolution shows
stochastic flickering and occasional flares (of amplitude 5 percent)
superimposed on a coherent sinusoidal pulsation of period
913s.48 and mean amplitude 12 percent.  There may be an orbital
modulation of period 3.75 hr and amplitude 8 percent.  The x-ray
observations also show evidence of a period of ~ 900-1000s.  Low
resolution optical spectra show broad He and Balmer lines, up to H11,
in emission.  The lines have fwzi of ~ 1600 km/s and vary in
strength through the 913-s period, with most variation being
noticed in the higher Balmer lines.  High-resolution optical spectra
show that many emission lines have multiple components.  The star
is at R.A. = 7h28m44s.4, Decl. = +10o02'46" (+/- 1".5, equinox 1950.0).


SY MUSCAE
     P. Whitelock, South African Astronomical Observatory, telexes:
~The symbiotic star SY Mus does not appear to have undergone any
gross changes in the infrared that might correspond with those
reported in the ultraviolet (IAUC 3657).  On Feb. 4 the JHKL magnitudes
were as follows: J = 5.93, H = 4.95, K = 4.62, L = 4.37 (with
standard errors of +/- 0.05).  These values are not significantly
different from those measured in 1976."


PERIODIC COMET SCHWASSMANN-WACHMANN 1
     J. Bortle, Stormville, NY, and J.-C. Merlin, Le Creusot,
France, have independently reported a new outburst of this comet.
Available visual magnitude estimates are: Apr. 13.08 UT, 13.1
(Bortle, 0.32-m reflector); 13.9, 11.5 (Merlin); 14.19, 12.8 (C. S.
Morris, Harvard, MA, 0.25-m reflector); 14.87, 11.6 (G. M. Hurst,
Wellingborough, England, 0.26-m reflector); 15.13, 12.6 (Morris).
Bortle adds that the coma, of diameter 0'.25, was tiny, dense, but
not particularly condensed.


1982 April 16                  (3687)              Brian G. Marsden

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