COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                     NUMBER 755

                                   Konkoly Observatory
                                   Budapest
                                   1973 January 5



                        MU Cas

MU Cas = BD + 59d22 = S 4672 was discovered by Hoffmeister
in 1949.
First elements were found by Wenzel (Veroff.Sternwarte 
Sonneberg 2. 5. 354. 1956):

Min.= J.D. 2427962.509 + 3.861145d . E
 (E);(10m-10.3m ph)

     Further observations by Romano (Osservat.Ptivato Specola
"Ariel" No. 17. 32. 1959), Zonn and Semeniuk (Acta Astron. 9. 3. 158.
1959) confirm Wenzel's elements.
     Lange, (Astr.Circ. 542. 1969) observed the star (1969 Aug. 29)
and recognized ultrashort light variations (RRs).

Max.= J.D. 2440464.305 + 0.0624312d . E

So I evaluated 64 short-exposed plates (Exposure 8 min.)
obtained in 4 nights at our observatory. No ultrashort light 
variations were found.
Further, I examined 114 sky patrol plates of our observatory
and 152 plates of Schwerin Observatory.
I also confirm the elements published by Wenzel and the
Beta-Lyrae-type.

Observed minima:
J.D. 24...    E         O-C
------------------------------------------
37082.438   +2362     -0.089d
39026.561   2865,5    -   65    Min.II
  028.429   2866      -  127
  057.422   2873,5    -   93    Min.II
  059.409   2874      -   39
  061.335   2874,5    -   43    Min.II
  088.259   2881,5    -  145    Min.II
  146.260   2896,5    -   55    Min.II
  387.563   2959      -   80
  389.476   2959,5    -   97    Min.II
40924.285   3357      -   93
------------------------------------------

Particulars will be published in "Mitteilungen der Bruno-H.-
Burgel-Sternwarte  Hartha"  Heft  5.


                      K. HAUSSLER
                  Bruno-H.-Burgel-Sternwarte
                     DDR 7302 Hartha





                            UY Mon

   The GCVS 1970 contains the following elements for this
variable stars:

  Min. = J.D. 2427660.593 + 1.261246d . E     (E)

   It was my intention to verify these elements. Different
periods were published before.
   291 sky patrol plates of Sonneberg Observatory were examined. 
I found 4 Min. I and 8 Min. II.
   The observations confirm the above mentioned elements.

Improved elements:
Min.= J.D. 2438411.508 + 1.261253d . E       (EB)
                                              
(9.6m-10.0m / 9.9m ph)

Observed minima:

J.D.24...       E           O-C
---------------------------------------------
27660.593    - 8524      +0.006d    GCVS 1970
35924.341    - 1972      +   24
37317.426    -  867,5    +   55
37561.374    -  674      -   49     Ahnert, P.
37696.377    -  567      -   1
38003.512    -  323,5    +   9
38411.508         0      +   0
38413.453    +    1,5    +   53
38466.403    +   43,5    +   30
38471.383    +   47,5    -   35
39056.610    +  511,5    -   29
39200.388    +  625,5    -   34
39533.413    +  889,5    +   20
40859.574    + 1941      -   26
---------------------------------------------


   Comparison stars and a minimum in "Mitt.Verand.Sterne Bd.
2. 62 by Ahnert, P.
   The light-curve will be published in "Mitteilungen der
Bruno-H.-Burgel-Sternwarte Hartha" Heft 5.


                        H. BUSCH
                   Bruno-H.-Burgel-Sternwarte
                     DDR 7302 Hartha