COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                     Number 1899

                                  Konkoly Observatory
                                  Budapest
                                  1980 December 29

                                  HU ISSN 0374-0676


    PHOTOELECTRIC MINIMA OF THE ECLIPSING BINARY DM PERSEI


   The eclipsing binary DM Per (BD +55d616, HD 14871) was observed 
photoelectrically at Ege University Observatory and three
primary and three secondary minima were obtained. The observations
were made in B, V filters with the 48 cm Cassegrain telescope
equipped with an unrefrigerated EMI 9781 A photomultiplier.
   BD +55d590 (HD 14331) was used as comparison star.
   The (O-C) values were calculated with the following elements
given by Scaltriti (1976):
        MinI (Hel) - 2441920.4543 + 2.7277427d E

                    Table I
            Times of minima
Min. (Hel.)      O-C       Filter   Min.
2444491.3405   -0.0113       B,V      II
    499.5237   -0.0113       B,V      II
    506.3519   -0.0025       B,V      I
    510.4348   -0.0112       B,V      II
    517.2671   +0.0018       B,V      I
    566.3676   +0.0029       B,V      I


   An interesting feature observed during the observations of
primary minima was the variable depth. The level of light obtained 
on November 22, 1980 was about 0.03m brighter than those obtained 
on September 23, and October 4, 1980.
   Another remarkable feature is that the mid-primary does not
show any shift; while a noticeable displacement of mid-secondary
can be seen from the (O-C) values given in Table I. This could be
due to the eccentricity of the orbit of the system.

                           CENGIZ SEZER

                      Ege University Observatory
                        Bornova-Izmir, Turkey
Reference:

Scaltriti, F., 1976, Astron. Astrophys. Suppl. 25,291 [BIBCODE 1976A&AS...25..291S ]