COMMISSION 27 OF THE I. A. U.
           INFORMATION BULLETIN ON VARIABLE STARS
                       Number 2884

                                        Konkoly Observatory
                                        Budapest
                                        24 March 1986

                                        HU ISSN 0374 - 0676




                 THE VARIABILITY OF BD+60deg562



      Bartolini et al. (1982) have noted variability of an undetermined
nature for the star BD+60deg562, noting a range in V magnitude of 9.95 to 10.05
and in (B-V) of +.39 to +.45 over a time spread of 230 days. In an effort to
determine the type of variability of this star, differential BV photometry
was carried out on 43 nights from October, 1984 to January, 1986 with the
0.6-m. telescope and automated photon-counting photometer with its uncooled
EMI 9924A photomultiplier tube of the Corralitos Observatory. The comparison
stars were those of Bartolini et al.: BD+60deg493 (V=8.44; B-V=+.79) and
BD+60deg497 (V=8.80; B-V=+.57). Extinction and transformations to BV magnitudes
were found by observations of standard stars.
      No obvious variability either of short or long term was found for
BD+60deg562. The differential V and (B-V) magnitudes of BD+60deg562 were compared
to both comparison stars separately. The residuals from the mean for each
difference were found and compared for evidence of variability of either
BD+60deg562 or its two comparison stars. Table I shows the results, where VAR
denotes BD+60deg562, COMP1 BD+60deg493, and COMP2 BD+60deg497. The mean value of
DeltaV for (COMP1-COMP2) was found to be -.36 (average residual 0.02) and that of
Delta(B-V) as +.22 (.02), both in good agreement with the adopted magnitudes for
the comparison stars. The mean V magnitude for BD+60deg562 was 10.03 and its
(B-V) +.32.



        Table I Average residuals about the mean


                    V Magnitude               (B-V) Magnitude

            (COMP1-VAR)   (COMP2-VAR)     (COMP1-VAR)  (COMP2-VAR)
Mean         -1.58          1.23              0.48       0.25
Av. Res.       .02           .02               .02        .02



      The average residuals from the mean for the comparison stars with
each other and the variable with each comparison being identical, there seems
no compelling reason to assume that variability of BD+60deg562 is indicated by
the data taken. However, the average residuals from the mean were larger than
expected and would mask small variations. Nonetheless, a change in V magnitude 
of 0.10 such as that observed by Bartolini et al. should have been obvious.
Buscombe (1977) compiles spectral types of B9 V and A0 V for BD+60deg562. It
is tempting to suggest that perhaps an emission episode was in progress during
the observations of Bartolini and colleagues, since their observations 
resemble the sort of longterm photometric variations undergone by some Be stars
when active.

    Special thanks are rendered to B. Goodrich for automation of the
photometric system



                          E.M. HALBEDEL

                          Corralitos Observatory
                          P.O. Box 16314
                          Las Cruces, NM 88004
                          U.S.A.




 References:
 Bartolini, C., Custodi, P., Dell'atti, F., Guarnieri. A. & Piccioni, A.
       1982, Inf. Bull. Var. Stars, No. 2139.
 Buscombe, W. 1977, MK SPECTRAL CLASSIFICATIONS: THIRD GENERAL CATALOGUE
       (Evanston, IL). [BIBCODE 1977msct.book.....B ]