COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                    Number 2182

                                 Konkoly Observatory
                                 Budapest
                                 1982 August 2

                                 HU ISSN 0374-0676




     VARIABILITY OF BD +40d4145 A MEMBER OF NGC 6910




UBV photometric standards in galactic cluster NGC 6910 were 
observed with the 60 cm reflector at Ostrowik Station of Warsaw
University Observatory on February 16, 1982. The unrefrigerated
one channel photometer with 27" diaphragm was used. Stars Nos. 1,
2,3,4,5,6,8 (numeration according to Hoag et al., 1961) were
investigated through V and B filters. It was found that the star
No. 5 = BD +40d4145 has luminosity V = 8.69m and colour B-V=0.83m
instead of the catalogue values J = 10.05m and B-V = 0.19 (Hoag
et al., 1961). Short time scale variations with the amplitude of
about 0.20m were observed in both filters.




                     Table I
             BV observations of BD +40d4145
      Date       JD Hel.           V        B-V
                  244+
Sep.21, 1981   4869.2870        10.03m      0.20m
Feb.16, 1982   5017.6545         8.41       1.05
                   .6615         8.61       0.89
                   .6656         8.59       0.72
                   .6689         8.75       0.82
                   .6733         9.05       0.65
                   .6775         8.61:      0.88:
                   .6823         8.79:      0.76:
Mar.27,1982    5056.6053         8.64       0.89
Apr.14,1982    5076.5236         8.73       0.81
May. 5,1982    5095.4546        10.05       0.19
Jun. 4,1982    5125.5031        10.07       0.23
Jun.25,1982    5146.3777        10.06       0.18
Jul. 7,1982    5158.4071         9.97       0.27
Jul. 8,1982    5159.4226        10.02       0.22



Untypical V and B-V values were also found on March 27, 1982 and
April 14, 1982. However, on May 5, 1982 and later the star was
in its normal state. We have also reexamined our observations
from September 1981. All observations from September 1981 until
July 1982 are listed in Table I. Mean errors are 0.015m and 0.020m
in V and B-V, respectively. Instrumental quantities were transformed 
to BV system using standard methods. As far as we know
BD +40d4145 has not been known as a variable star.





          JANUSZ KALUZNY, GRZEGORZ POJMANSKI
          Warsaw University Observatory
          00-478 Warszawa
          Al. Ujazdowskie 4
          Polska





Reference:
Hoag, A.A., Johnson, H.L., Iriarte, B., Mitchell, R.I., Hallam,
    K.L., Sharpless, S. 1961, Photometry of stars in galactic
    cluster fields, Publ. U.S. Nav. Obs., 17, Part VII, p. 454 [BIBCODE 1961PUSNO..17....1H ]