COMMISSION 27 OF THE I. A. U.
        	INFORMATION BULLETIN ON VARIABLE STARS
                 	     NUMBER 838
                        	     	Konkoly Observatory
                             		Budapest
                             		1973 October 26


	           MINIMA OF ECLIPSING VARIABLES

  The list below contains minima of eclipsing variables observed
at the "Guido Horn D'Arturo" Observatory of Tizzano, near Bologna.
All are photoelectric timings reduced by the tracing paper method.
  Column "N" denotes the number of observations. Column "O - C"
was determined with elements given in "Rocznik Astronomiczny Ob-
servatorium Krakowskiego 1973".
  The observations were made with the 350 mm diam., f=180 cm newtonian
reflector of our observatory and a photometer employing an 
unrefrigerated 1P21 photomultiplier tube.

Star		J.D. hel	O-C	N
          	2441...
UX Her    	543.3884     -0.0047   12
W UMa     	720.3828     -0.0047   41
          	740.4014     -0.0044   52
	        742.4045     -0.0038   40
          	743.4023     -0.0062   43
RX Her    	885.4053     +0.0020   19
SW Las   	900.4293     -0.0509   14
RX Her    	901.4136     +0.0032   46
RT And    	905.4092     -0.0098   25



Bologna, October 16, 1973


       L. BALDINELLI, F. BENFENATI, P. CORTELLI

         "G. Horn D'Arturo" Observatory




     OBSERVATIONS OF LONG  PERIOD VARIABLE STARS

These are the results of systematic observations of some
long period variable stars. The observations were made with the
350 mm diam., f=180 cm newtonian reflector of the Tizzano Observatory,
using a 1P21 unrefrigerated photomultiplier and yellow filter (V
in the UBV system).
For each  variable, a comparison star was selected and also
a check star; the second being a star of well known photoelectric
magnitude (Ref. Photoelectric Catalogue by Blanco and Others;
U.S.N.O. Publ. II, vol. XXI; 1970). The check star was also used
to determine the magnitude of the comparison star. We give here
also the data on the comparison and check stars used.

RY Dra    check star: BD+67d773   m_v = 5.32
          comparison star: BD+65d913 m_v = 6.41
RY UMa    check star: BD +62d1227 m_v = 8.20
          comparison star: BD +62d1228 m_v = 6.70
VW UMa    check star: BD +73d504   m_v = 6.92
          comparison star: BD +69d602 m_v = 6.35
R CrB     check star: HD 140913    m_v = 8.08
          comparison star: the same
 
                         Observations (V magnitudes)

J.D.	RY	RY	VW	R	J.D.	RY	RY	VW	R
2441..	Dra	UMa	UMa	CrB	2441..	Dra	UMa	UMa	CrB

392	6.08	6.95	7.47	 -	477	 -	 -	 -	8.61
398	6.03	6.83	7.45	 -	478	 -	 -	 -	8.52
399     6.08 	6.81 	7.27     -      481 	 -	 -	 -	8.11
412     6.06 	6.82 	 -    	 -	486	6.23	6.88	7.12	7.53
413      - 	6.83 	7.20     -	487	 -	 -	 -	7.39
415     6.08 	6.90 	7.19     -	502	6.22	6.97	7.20	6.06
418     6.07 	6.98 	7.11 	 -	539	6.30	7.02	7.00	 -
449     6.10 	6.86 	7.18 	10.06	545	6.35	6.97	7.06	 -
462     6.18 	-        -	 -	692	6.51	6.93	7.01	 -
467     6.24 	6.68 	 -	 -	721	6.45	6.89	6.85	 -
468      -	-	 -	9.90	737	6.47	6.92	7.16	 -
474      -	6.82	7.10	8.89	739	6.49	7.00	7.19	 -
476     6.25	6.77	6.98	8.67

                                   
J.D.	    RY	  RY	VW		J.D.	RY	RY	VW
2441...     Dra   UMa   UMa 		2441..	Dra	UMa	UMa	
                                   	
745       6.47 	 7.03 	7.21		815	6.55	6.95	7.57
753       6.47 	 6.97 	7.20           	835	6.65	6.86	7.71
764       6.50 	 6.85 	7.45           	892	6.62	7.11	7.58
778       6.58 	 6.96 	 -		906	6.55	7.16	7.60


Bologna, October 17, 1973

        L. BALDINELLI, F. BENFENATI, P. CORTELLI

           "G. Horn D'Arturo" Observatory