COMMISSION 27 OF THE I. A. U.
		INFORMATION BULLETIN ON VARIABLE STARS
			    Number 2370

							Konkoly Observatory
							Budapest
							13 July 1983

							HU ISSN 0374-0676


		BD + 43d1894, A NEW DELTA SCUTI STAR *



  During the photographic observation of UU Lyn, one of the authors of this
paper, P. Frank detected that one of the comparison stars, BD + 43d1894 was
a rapid variable with small amplitude. This could be confirmed 
photoelectrically by the other co-authors.
  P. Frank used a Zeiss Tessar 250/3.5 in combination with Kodak Technical
Pan, hypersensitized, and measured the brightness by a microdensitometer.
M. Fernandes observed with a 10in. Schmidt-Cassegrain telescope and a digital
photometer equipped with an EMI 9781B tube and filters for B and V. F. Agerer
observed with a 16in. Schmidt-Cassegrain telescope and a semiautomatic 
photometer, equipped with a 1P21 and Schott GG 495 filter for V.
  A typical light curve is presented in Figure 1. Fortunately, on JD 2445 406
photoelectric and photographic observations were made independently. Both 
observations are shown in the same Figure. The excellent accuracy of the 
photographic method is demonstrated. The shape of the light curve is almost 
sinusoidal, the star varies between 10.86m and 11.08m (photovisual). From 12 maxima

                         [FIGURE 1]

  Figure 1  Light curve of BD + 43d1894 in V (comparison BD + 43d1896) and
 photographic. The photovisual magnitudes are calibrated with the sequence
 of the Hyades.

* BAV-Mitteilungen Nr. 37


(Table I) the following elements could be derived:

       Max. = JD 2445 342.3822 + 0.097949d E
                          +-24        +-4


                   Table I
            Maxima of BD + 43d 1894
---------------------------------------------
E      JD 2445...      O-C  method   observer
---------------------------------------------
0      347.3827     +0.0005   pg       Fr
1      347.4743     -0.0058   pg       Fr
2      347.5771     -0.0009   pg       Fr
326    379.3174     +0.0039   V        Fd
327    379.4243     +0.0129   V        Fd
357    382.3630     +0.0131   V        Ag
602    405.3395     -0.0078   V        Fd
602    406.3437     -0.0036   pg       Fr
503    406.4367     -0.0086   V        Fd
503    406.4423     -0.0030   pg       Fr
604    405.5367     -0.0065   pg       Fr
1275   472.3708     +0.0060   V        Fd
---------------------------------------------



The O-C against these elements are given in Table I. The period seems to be
somewhat variable.
  On two occasions, observations in B and V were performed simultaneously.
The amplitude in B (0.30m) is larger than in V (0.22m). The minima and maxima
in B follow those in V by 5 to 14 minutes, the minima and maxima of B-V occur
even 5 to 15 minutes later. The colour index varies around 0.00m. In view of
the photometric characteristics, BD + 43d1894 is to be considered as a Delta
Scuti star.





                  F. AGERER
                  M. FERNANDES
                  P. FRANK
               BAV, Munsterdamm 90
               1000 Berlin 41, Germany