COMMISSION 27 OF THE I. A. U.
       INFORMATION BULLETIN ON VARIABLE STARS
                  NUMBER 375


                              Konkoly Observatory
                              Budapest
			



          POSSIBLE OUTBURST OF HD 108486,
             OBSERVED 1965 APRIL 5


     At a photoelectric test for small variability of
A-stars, performed in 1965 at Kottamia Observatory, there
were among others 28 stars of the Coma Cluster on the
program. One of them was the Am-star HD 108486 = No. 139 of
Johnson and Kuckles, ApJ 122, p. 209. During six nights in
1965 this object was compared in the V region 36 times
respectively with the stars HD 108651 - No. 145 and
HD 107935 = No. 104. The mean error of one measurement was
about +/-0.008 mag. The observations were made within large
intervals, mostly about one hour, as there were other stars
to be tested as well.
      On April 5, 1965, HD 108486 showed an increase of
brightness of 0.15 mag. During the observation it was 
supposed at first that it might be a common light variation.
But one hour later the observation showed again the normal
brightness, so we have here most probably a small eruption.
This observation seems to be quite certain, as the difference
of brightness, deduced from the measurements, between the
two comparison stars is constant, as well as the differences
of brightness between the comparison stars and other test
stars.
      In 1967 and 1968 BD 108488 was compared with
HD 108651 42 times in all with the 35-cm-mirror in the
UBV-system here at Sonneberg. In all three colours the light
fluctuations were not larger than 0.03 mag.

Deutsche Akademie der
Wissenschaften zu Berlin
Zentralinstitut fur Astrophysik
Sternwarte Sonneberg

                             G. JACKISCH