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IAUC 3750: Z And; V1343 Aql; NGC 3347

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IAUC number 

                                                  Circular No. 3750
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


Z ANDROMEDAE
     A. Altamore, Istituto Astronomico, Rome University; A. Cassatella,
European Space Agency, Villafranca; C. Eiroa and T. Neckel,
Max-Planck-Institut fur Astronomie, Heidelberg; and R. Viotti, Istituto
Astrofisica Spaziale, Frascati, telex: "Following Netzer's
announcement (IAUC 3738) of new activity in Z And observations
were made in November with IUE at Vilspa and in the JHKLM system
with the infrared photometer on the 2.2-m telescope at Calar Alto.
It was found that the ultraviolet continuum and emission lines are
now about 40 percent stronger than in 1980 Aug.  On the other
hand, the infrared spectrum does not show a significant difference
with respect to 1981 (Eiroa et al. 1982, IAU Colloq. 70, 43) and
1982 July.  These results confirm the presence of long-term variability
of the ultraviolet radiation source during quiescence.  This variability
is uncorrelated with the cool spectrum (Taranova and Yudin 1981, Astr.
Zh. 58, 1249) but could be the precursor of a new outburst.  Continuous
monitoring is therefore necessary."


V1343 AQUILAE
     G. Henson, J. Kemp and D. Krauss, Physics Department, University
of Oregon, Eugene, write: "We have observed an extremely low
brightness for V1343 Aql = SS 433 on Sept. 23.184 UT.  The observation
in our V band (Kemp et al. 1981, Vistas Astr. 25, 31) coincided with
the principal minimum of the 13-day binary-like period.  We found a
relative magnitude of +5.74 +/- 0.57 between SS 433 and our comparison
star No. 1 (Kemp et al. 1981).  This is the lowest brightness recorded
among our 305 observations 1979-82."


NGC 3347
     H. A. Dottori, Instituto de Fisica, Porto Alegre, Brazil,
reports an apparent variation in brightness and colors of the
galaxy NGC 3347 (cf. Dottori 1979, A. Ap. Suppl. 37, 519; Wegner
1979, Ap. Sp. Sci. 60, 15):

          UT          V     B - V   U - B  Diaphragm Observer

     1975 Apr. 15   12.75   +0.90   +0.40    12".6   Dottori
     1976 Apr. 25   14.35   +0.61    0.00    14.3    Wegner

On the other hand, the brightness and colors of the companion
galaxy NGC 3358 were unchanged.


1982 December 3                (3750)              Brian G. Marsden

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