COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                      NUMBER 510

                               Konkoly Observatory
                               Budapest
                               1971 January 21




     PROCEDURAL CHANGES FOR USERS OF THE IAU(27). RAS
   FILE OF PHOTOELECTRIC OBSERVATIONS OF VARIABLE STARS


      As announced by Dr. G.H. Herbig in IAU Information
Bulletin No. 18, the Library of the Royal Astronomical Society 
maintains, in cooperation with Commission 27, a file of
unpublished photoelectric measurements of variable stars. In
brief, the first fourteen files are IAU(27). RAS-- 
      1  3433 UBV measures of V Sge by Herbig, Preston,
         Smak, and Paczynski.
      2. About 2390 U measures of AE Aqr by Walker.
      3. About 990 uby measures of BD+14d341 by Smak.
      4, 2728 U measures of Nova WZ Sge by Krzeminski.
      5. 508 UBV measures of HD 116994 by Chambliss.
      6. About 6500 UBV measures of Nova Z Cam by
         Krzeminski and Mumford.
      7. About 3370 yellow and white measures of EX Hya
         by Krzeminski.
      8. 1191 BV measures of AU Pup by Chambliss.
      9. About 1200 uby measures of HR 7484 by Koch.
     10. 1167 blue measures of 16 Lac by Walker.
     11. Measures of EM Cyg by Mumford and Krzeminski.
     12. UBV measures of SX Ari, CU Vir, HD 173650, and
         chi Psc by Blanco, Catalano, and Godoli.
     13. 964 BV measures of TT Lyr, AD Her, and RV Oph by
         Walter
     14. 630 UBV measures of HD 199757 by Chambliss.

     A second depository for these files is being instituted 
in Odessa, for the convenience of Eastern European
astronomers. Copies of specific whole files (not partial
files) may be obtained at cost by writing to either.


Dr. E.W. Maddison, Lobrarian      Dr. V.P. Cesevic
Royal Astronomical Society   or   Astronomical Observatory
Burlington House                  Park Shevchenko
London, W.1., England             Odessa, U.S.S.R.



     New material for deposit in these archives should
not be sent directly to the R.A.S., but rather a duplicate
copy should be sent to Dr. Cesevic and the original copy to
Dr. W.S. Fitch, Steward Observatory, University of Arizona,
Tucson, Arizona 85721, U.S.A. for assignment of the file
number and forwarding to the R.A.S. New files may be of any
length, but must be typewritten or handwritten in black ink
on sheets smaller than 10x15 inches (25.4 x 38.1 cm). Each
copy must have a cover sheet giving a brief description of
the tabular contents. Questions regarding the detailed 
operation of the depository service should be addressed to me,
as successor to Dr. Herbig in supervising the file.

January, 1971


                       WALTER S. FITCH
                     Steward Observatory