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IAUC 3772: lambda And; 1982f; SU Tau

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IAUC number 

                                                  Circular No. 3772
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


lambda ANDROMEDAE
     S. L. Baliunas, A. K. Dupree and E. F. Guinan, Center for
Astrophysics, report that a large increase in the ultraviolet
emission-line fluxes of the long-period RS-CVn giant lambda And was
observed with IUE during the photometric minimum of the 54-day
rotation period.  The maximum of the flare occurred at about 1982
Nov. 6.31 UT with the emission-line fluxes of C III 118 nm, C IV
155 nm and Ly-alpha 122 nm showing the greatest enhancements of ~ 3 to
5 times relative to their quiescent values.  The risetime of the
flare was ~ 60 to 90 min, while the decay time was > 5 hr.  This
appears to be the first time a flare event of this kind has been
observed for a cool giant star, and it is suggested that the star
be monitored more intensively at all wavelengths during 1983 Feb.
23-28, the next predicted light minimum.


PERIODIC COMET CHURYUMOV-GERASIMENKO (1982f)
     Further total visual magnitude estimates: Feb. 1.81 UT, 10.4
(J.-C. Merlin, Le Creusot, France, 0.26-m refl.); 4.83, 10.6
(Merlin); 11.04, 10.6 (J. Bortle, Stormville, NY, 0.32-m refl.).

     Ephemeris continuation from the elements on IAUC 3743:

     1983 ET     R.A. (1950.0) Decl.      p        r       m1

     Feb. 15     7 19.46    +36 44.3    0.826    1.699    13.0
          25     7 28.49    +35 16.6
     Mar.  7     7 39.53    +33 45.9    1.084    1.839    14.1
          17     7 52.06    +32 13.9
          27     8 05.68    +30 41.3    1.390    1.985    15.2
     Apr.  6     8 20.01    +29 08.2
          16     8 34.77    +27 34.4    1.732    2.133    16.1
          26     8 49.80    +25 59.8
     May   6     9 04.90    +24 24.4    2.098    2.281    17.0
          16     9 19.99    +22 48.1
          26     9 34.99    +21 10.9    2.474    2.428    17.7


SU TAURI
     Visual magnitude estimates by J. Bortle, Stormville, NY: Jan.
22.0 UT, 12.2; Feb. 2.0, 11.5; 10.1, 10.8; 11.1, 11.0.


1983 February 14               (3772)              Brian G. Marsden

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