COMMISSION 27 OF THE I.A.U.
                 INFORMATION BULLETIN ON VARIABLE STARS
                             Number 3219

                                                        Konkoly Observatory
                                                        Budapest
                                                        27 July 1988

                                                        HU ISSN 0374 - 0676


         UBV PHOTOELECTRIC PHOTOMETRY OF THE LATE TYPE
                 STARS HD 22649 AND HD 23475

Within our research programme on magnetic stars, photometric and magnetic
observations were planned of the late type stars in which magnetic fields
have been measured by Babcock (1958). However, while it was not possible
to perform magnetic field measurements, photoelectric observations of the
star HD 22649 (HR 1105=BD Cam, S 3.5) were carried out in 1973 and 1974 at
the Stellar Station of the Catania Astrophysical Observatory. The measurements 
were performed in the UBV system at the 90 cm telescope with the
equipment described by Blanco et al. (1978). The chosen comparison stars
were HD 22764 (HR 1112, K4Ib) and HD 22375 (HR 1155, M2IIab). Search in the
literature soon revealed that HD 23475 was also variable (with name BE Cam,
Stebbins and Huffer 1930) so that the observations were referred to the
other comparison, i.e. HD 22764. By the time when the programme on late
type magnetic stars was dropped out because of a lot of difficulties, among
which mainly the impossibility of systematic monitoring of these stars during
winter time, we had collected some sets of measurements which were averaged
to give one measurement per night.


                   Table I

Magnitude differences HD 22649 minus HD 22764 versus Julian day
                in our natural system

JD
244 0000.0+  DeltaU     DeltaB    DeltaV

1963.503     -0.830    -0.804    -0.707
1964.533     -0.842    -0.799    -0.706
1992.429     -0.769    -0.749    -0.693
2004.444     -0.765    -0.756    -0.715
2043.431     -0.822    -0.771    -0.709
2061.369     -0.812    -0.751    -0.681
2071.375     -0.802    -0.715    -0.648
2097.353     -0.821    -0.773    -0.712
2365.522     -0.856    -0.696    -0.610
2397.443     -0.783    -0.665    -0.609

   These data are listed in Table I for HD 22649 and in Table II for HD 23475,
in the form of magnitude differences (variable minus comparison) versus Julian
day.


                       Table II

Magnitude differences HD 23475 minus HD 22764 versus Julian day in
               our natural system

JD
244 0000.0+    DeltaU     DeltaB     DeltaV

1963.509      -1.234     -1.326     -1.406
1964.542      -1.220     -1.295     -1.392
1992.438      -1.082     -1.219     -1.366
2004.481      -1.112     -1.235     -1.385
2043.437      -1.017     -1.180     -1.330
2061.384      -1.040     -1.211     -1.359
2071.382      -1.013     -1.172     -1.308
2097.362      -1.041     -1.254     -1.144
2365.526      -1.042     -1.166     -1.319
2397.448      -1.013     -1.163     -1.299



  F.A. CATALANO 1,3     F. LEONE 2,3    S. VACCARI 3

1. Istituto di Astronomia - Universita di Catania
2. Osservatorio Astrofisico di Catania
3. C.N.R. - Gruppo Naz, di Astronomia, Unita di Ricerca di Catania
   Italia



References:

Babcock, H.W., 1958, Astrophys. J. Suppl 3, 141. [BIBCODE 1958ApJS....3..141B ]
Blanco, C., Catalano, F.A., Strazzulla, G., 1978, Astron, Astrophys, Suppl.
    Ser. 31, 205. [BIBCODE 1978A&AS...31..205B ]
Stebbins, J., Huffer, C.M., 1930, Washburn Obs. Publ. Vol. XV, part 3, p. 139. [BIBCODE 1930PWasO..15..140S ]