Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

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

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 3686  SEARCH Read IAUC 3688
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

Read IAUC 3686  SEARCH Read IAUC 3688


Our Web policy. Index to the CBAT/MPC/ICQ pages.


Valid HTML 4.01!