COMMISSION 27 OF THE I. A. U.
	 INFORMATION BULLETIN ON VARIABLE STARS
		     Number 2644

			 	   Konkoly Observatory
				   Budapest
				   14 December 1984

				   HU ISSN 0374 - 0676



	    ON THE APSIDAL MOTION OF AG PERSEI


  The apsidal motion of the detached eclipsing binary system AG Per was
discussed by Martin (1938), Oosterhoff (1943), Ashbrook (1949), Morley (1966),
Semeniuk (1968) and Gudur (1978). The period of apsidal motion was found to
be 76.4+-0.5 years and 76.55+-0.05 years,by Semeniuk (1968) and Gudur (1978),
respectively.

  We obtained two new photoelectric minima with the 48 cm Cassegrain 
telescope of the Ege University Observatory. An unrefrigerated EMI 9781A 
photomultiplier tube was used in conjunction with B and V filters which are very
close to Johnson's standard system. These new minima are given in Table I
together with the photoelectric ones obtained by Diethelm.


		    Table I
	     Times of minima of AG Persei
-------------------------------------------------------------
J  D  Hel.	Min. Filters  O-C      E       Reference
-------------------------------------------------------------
24 44 634.352	II   -	      0.030	9704   Diethelm, 1981a
      925,392	 I   -	     -0.053	9848   Diethelm, 1981b
      929.463	 I   -	     -0.039	9850   Diethelm, 1981b
   45 271.382	II   -	      0.039    10018   Diethelm, 1982
      626.4097	II   B,V      0.0389   10193   This paper
      984.3988	 I   B,V     -0.0428   10370   This paper
-------------------------------------------------------------

 The O-C values in this table were computed using the linear part of the
following light elements given by Semeniuk (1968):

  Hel Min I J D = 24 24 946.5153 + 2.02872963d E-
                  -0.04517d cos(60.8d + 0.02616d E)

  Hel MinII J D = 24 24 947.5297 + 2.02872963d E+
                  +0.04517d cos(60.8d + 0.02616d E)

                           [FIGURE 1]

              Figure 1. The O-C diagram for AG Per

They are also plotted in Figure 1, where the continuous curves represent the
periodic terms in the epochs of minima. The other times of minima in this figure
are taken from the literature (see Gudur, 1978).
 The times of minima are in good agreement with the continuous curves in
the figure. One of them, obtained by Diethelm, shows large deviation. This
is probably due to an observational error. As a result, one can say that the
new observations confirm the apsidal motion period of AG Per given by Semeniuk
(1968) and Gudur (1978).





			   N. GUDUR, C. SEZER, O. GULMEN
			   Ege University Observatory
			   Bornova-Izmir-Turkey


References:

Ashbrook, J.: 1949, Astron.J. 55, 2. [BIBCODE 1949AJ.....55....2A ]
Diethelm, R.: 1981a, BBSAG Bull. Nr. 52.
Diethelm, R.: 1981b, BBSAG Bull. Nr. 57.
Diethelm, R.: 1982, BBSAG Bull. Nr. 63.
Gudur, N.: 1978, Astrophys.Space Sci. 57, 17. [BIBCODE 1978Ap&SS..57...17G ]
Martin, W.Chr.: 1938, Bull.Astron.Inst.Netherlands, 8, 286. [BIBCODE 1938BAN.....8..286M ]
Morley, J.: 1966, Inform.Bull.Var. Stars, Nr. 163.
Oosterhoff, P.Th.: 1943, Bull.Astron.Inst. Netherlands, 9, 416. [BIBCODE 1943BAN.....9..416O ]
Semeniuk, I.: 1968, Acta Astron. 18, 1. [BIBCODE 1968AcA....18....1S ]