COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                     Number 1156

                                Konkoly Observatory
                                Budapest
                                1976 July 23


      B2 1101+384: VARIABILITY AND COMPARISON STARS


    Photoelectric UBV observations of the object B2 1101+384
have been carried out with the 60 cm reflector (Lyutyj, 1971) of
the Sternberg Institute Crimean Station with the purpose of 
detecting a short time variability. BD+39d2407 (Klemola, 1962)
was used as the comparison star, SSII-5 (Eggen, Sandage, 1965) -
as the check star. The observed magnitudes were transformed to
Johnson's system. The values of V, (B-V) and (U-B) for B2 1101+
384 together with the dates are given in Table I. The accuracy
of the observations (Tables I, II) is +-0.02m (for V and B-V) and
+0.03m (for U-B).
    Continuous observations in B-band were made on Jan. 7 and
Feb. 3, 1976 with integration time 40 sec. Considerable 
variability was not detected for 110 min. observation, although 
quasiperiodic fluctuations with amplitude 0.05m and time scale about
20 min. are not impossible.
    UBV magnitudes of six comparison stars (see Table II) were
also obtained. Designations of the stars coincide with those in
the work of Veron, Veron (1975). Nine plates were measured using
this standard sequence. The photographic B values are listed in
Table III with the dates, mean errors and telescopes used. The
comparison of photographic and photoelectric observations shows
a variability of B2 1101+384 about 1m. The observations during
JD 2442740-840 are of great interest. There was a flare with the
change of brightness rate about 0.5m in 3 days. Similar change was
also found by Miller (1975).

                              G.V. ZHUKOV
                          Engelhardt Observatory

References:
Eggen O.J., Sandage A.R., 1965, ApJ 141, 821. [BIBCODE 1965ApJ...141..821E ]
Klemola A.R., 1962, AJ 67, 740. [BIBCODE 1962AJ.....67..740K ]
Lyutyj V.M., 1971, Sternberg Inst. Reports, 182, 30.
Miller H.R., 1975, ApJ 201, L109. [BIBCODE 1975ApJ...201L.109M ]
Veron P., Veron M.P., 1975, Astron. and Astrophys. 39, 281. [BIBCODE 1975A&A....39..281V ]


                              Table I.

Date                JD          V         B-V         U-B

1975. Dec.31   2442778.474   13.09m     +0.53m      -0.64m
                      .481   13.16       0.50        0.66
                      .488   13.06       0.55        0.68
1976. Jan.7        785.421   13.04       0.45        0.70
                      .447   13.04       0.45        0.59 
                      .459   13.07       0.46        0.66
Feb.3              812.419   13.20       0.50        0.66
                      .451   13.22       0.55        0.69
                      .583   13.20       0.51        0.57
                      .633   13.26       0.47        0.57
Feb.4              813.480   13.24       0.49        0.66
                      .486   13.21       0.51        0.65



                           Table II.

No        V          B-V        U-B         Notes

1       14.39m     +0.56m     -0.04m
2       12.88      +0.71      +0.11
3       13.57      +0.89      +0.24         var ?
4       11.86      +0.52      -0.17
6       12.03      +0.89      +0.39
7       12.69      +0.84      +0.30




                    Table III.

               JD          B         sigma    Notes

         2441739.198     13.35m     +0m10      1
           42424.427     12.63       0.10      1
             432.328     12.75       0.09      1
             487.358     13.04       0.15      2
             749.490     13.43       0.07      3
                .509     13.26       0.14      3
             759.510     12.94       0.20      3
             774.487     12.92       0.05      3
             843.406     13.71       0.15      2

1- 38 cm Schmidt telescope of the Engelhardt Observatory.
2- 35 cm meniscus telescope of the Engelhardt Observatory.
3- 50 cm meniscus telescope of the Sternberg Institute,
       Crimean Station.