COMMISSIONS 27 AND 42 OF THE IAU
               INFORMATION BULLETIN ON VARIABLE STARS
                            Number 4067

                                                 Konkoly Observatory
                                                 Budapest
                                                 15 August 1994

                                                 HU ISSN 0374 - 0676


              A DIRECTORY OF COMPARISON STARS IN IBVS



  In many issues of IBVS observers have published their observations of particular 
variables, obtained by differential photometry in the UBV system. Usually they have specified
the comparison and check stars used, and often give UBV values. Whilst all variables 
(including new and suspected ones) reported in these pages are properly listed in the normal
Index to IBVS, it is beyond the scope of the Index to record ancillary information, such
as comparison stars used.
  Several years ago I wished to determine quickly which stars have been employed as
comparison stars, and have also been measured in the UBV system. I compiled a Directory
of Comparison Stars Cited in IBVS, commencing with IBVS No.2081, the earliest one
in my set. The Directory concentrates on fainter comparison stars, for which the IBVS
data is likely to be new. Stars brighter than 6.0V are generally omitted, as these stars all
appear in the Bright Star Catalogue. Some basic facts on the Directory are as follows:
Number of records: 520. IBVS numbers searched: 2081-4039. V and B-V values are
included, as are standard catalogue ids. Positions, for 1950, are given for all stars. 
Additional notes are given for about 50 stars. A number of misprints and cases of inconsistent
data are noted. The Directory does not purport to give complete data for each entry, but
rather, it guides the user to the original IBVS paper, where additional data will usually
be found.
  The Directory is available from the writer, as a hardcopy printout, or as IBM PC
readable files (Lotus 1-2-3 and ASCII text file formats). Interested persons may obtain
a copy at no cost by sending any recent reprints containing UBV photometric data.
Otherwise, the Directory is available by sending US$10 to cover postage and handling
costs.
  A second directory (the "Miscellaneous List") will also be sent. This file (about 380
records) lists in the same fashion comparison stars taken from a variety of other serials
and publications.


                         M. MOREL
                         18 Elizabeth Cook Drive,
                         Rankin Park NSW 2287
                         Australia