COMMISSION 27 OF THE I.A.U.
                  INFORMATION BULLETIN ON VARIABLE STARS
                              Number 2919

                                                         Konkoly Observatory
                                                         Budapest
                                                         24 July 1986

                                                         HU ISSN 0374 - 0676


                     SOME NEW POSSIBLE VARIABLE STARS

The Corralitos Observatory is at present involved in the photometric
monitoring in BV colors of some 253 Be stars. In the course of the first year
of this campaign it has been found that some of the comparison stars chosen
for differential photometry of the Be stars may be variable in themselves.
Normally two comparison stars are utilized for each potentially variable Be
star in the event that one might prove to be inconstant in magnitude. 
Twentynine 
of these stars can no longer be used since they show deviations from
mean magnitudes which suggest variability.
   The criterion for variability in a comparison star was decided upon
in the following way. Mean differences in V magnitude were found for 
(Comparison 1 - Comparison 2) and for each comparison star separately with the
program Be star. Since 70% of the Be program stars appear to be nonvariable,
it was usually easy to determine which of the comparison stars might be 
variable when the residuals from the means of all these differences were 
calculated. For the comparison stars whose magnitudes were considered to be 
constant,
the average residual from the mean was found to be 0.008 magnitudes in V.
For the purposes of this communication a comparison star was considered to be
unusable for that purpose (and hence potentially variable in its own right)
if the average residual from the mean was 0.020 magnitudes or greater. In
those instances where the average residuals from the mean for both the 
comparison stars from each other and also from the program Be star were 
unacceptably
great, it was indeterminable which comparison is potentially variable since the
Be star may also be variable. Therefore, these stars are denoted with an 
asterisk in the table following.
   The paucity of data and the non-uniform time intervals between observations 
prevent any statement on periodicity or total magnitude range from
being made. The stars considered as possible variables and their spectral
types follow. Spectral types are from the SAO CATALOG unless otherwise noted.


                             Table I

STAR           SP. TYPE                    STAR        SP. TYPE

HD 27749       A1m, F1 IIImVs  (1)      HD 166053      B9p Si  (3)
   31342       A0                          172948      A2
   32318       A2                          177559      B6 Vn   (2)
   31640       A2                          181414      A2
   34986       B8                          192538*     A0 III  (1)
   34974*      A0                          192605*     B9 V    (1)
   34986*      B8                          198959*     G0
   37200       A3                          203169      A2
   40254*      B8                          204008      A2
   40366*      A3                       BD+60 2231     G5 V    (4)
   50325       A2                         +54 2431*    G5
   50772*      A0 V (2)                   +26 809      A2
   51331*      B8                         +26 987      A0
   57297       A                          +24 934      A2
   158440      B8



(1) -- Kennedy, P.M. & Buscombe, W., MK SPECTRAL CLASSIFICATIONS PUBLISHED
       SINCE JASCHEK'S LA PLATA CATALOGUE (Evanston, IL), (1974). [BIBCODE 1974mscp.book.....K ]
(2) -- Buscombe, W., MK SPECTRAL CLASSIFICATIONS: THIRD GENERAL CATALOGUE
       (Evanston, IL), (1977). [BIBCODE 1977msct.book.....B ]
(3) -- Buscombe, W., MK SPECTRAL CLASSIFICATIONS: FOURTH GENERAL CATALOGUE
       (Evanston, IL), (1980). [BIBCODE 1980mscf.book.....B ]
(4) -- Buscombe, W., MK SPECTRAL CLASSIFICATIONS: FIFTH GENERAL CATALOGUE
       (Evanston, IL), (1981). [BIBCODE 1981mscf.book.....B ]


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