COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                     NUMBER 361


                                 Konkoly Observatory
                                 Budapest
                                 1969 July 7


             FLARES OF BD +13deg2618


      In the course of our programme of photoelectrical
monitoring of a set of dM, dMe and UV Ceti type stars we
have observed two flares on BD +13deg2618.
      This star, CVS 6977 (1), spectral type dM2e, was
observed earlier photographically by R. Weber (2) with the
following results: m_p max = 10.3m; m_p min = 11.2m, type C 
(long-period cepheid). A. D. Andrews (3) observed this star 
photoelectrically as a suspected flare star with the following
photometric results: V = 9.56m; B-V = 1.54m; U-B = 1.20m; no
flares were observed during a monitoring time of 1h12m.
     Our photoelectric observations were made in the
B-band with the 64 cm meniscus telescope, The time coverage
is shown in Table 1. The total coverage was 31h36m. Table 2
contains the flare characteristics according to (4). The
light curves of the flares have the relative intensities
(I_0+f-I_0)/I_0 as ordinates and Universal Time as abscissae.
     Dr. Vitrichenko obtained with the 122 cm reflector
of the Crimean Astrophysical Observatory the spectrogram of
this star with the dispersion of 130 A/mm. The spectrum was
taken during the photoelectrical monitoring when the star
was in a quiet state. Only the H-alpha-line is visible in
emission, its equivalent width is equal to 0.5A.


                  Table 1

Date 1969       Coverage U.T.

April 22   20h10m-15m; 21h04m-18m; 21h24m-38m
May    6   19h28m-40m; 19h44m-20h00m
      10   18h51m-19h08m; 20h38m-50m; 20h54m-21h10m
      16   19h17m-35m; 19h37m-20h00m; 20h39m-21h05m
           21h09m-54m; 21h58m-22h02m; 22h05m-20m; 22h28m-32m
      18   19h35m-20h38m; 20h39m-21h03m; 21h13m-38m
      23   19h00m-19m; 19h52m-20h30m; 20h57m-21h25m
      27   19h25m-30m; 19h32m-20h04m; 20h07m-21h09m
      30   19h34m-20h19m
  June 1   19h00m-20m; 19h29m-36m
       2   19h24m--20h06m; 20h12m-22h13m
       5   18h42m-54m; 20h04m-21h6m
       6   19h10m-20h00m; 20h18m-22h40m
       8   20h08m-21h30m; 21h44m-59m
       9   19h07m-51m; 20h10m-21h09m
      11   19h16m-31m; 19h34m-20h04m; 20h16m-56m; 20h53m-
           21h37m
      12   19h04m-38m; 19h39m-49m 
      13   19h03m-34m; 19h37m-20h40m
      17   19h14m-44m; 19h45m-20h20m; 20h30m-21h16m
      19   19h32m-20h30m; 20h43m-21h00m
      20   19h12m-45m; 19h46m-57m; 20h14m-21h05m

			[FIGURE 1]


                      Table 2

                 Duration
Date and U.T.  before  after                        Integrated
  of flare       maximum     Delta m  Delta m_lim   intensity,   Air
                (minutes)                            minutes     mass
1969
 May             t_b  t_a
16 21h50.5m      1.5  9.5       0.10m    0.03m         0.63      1.57
18 20h16.0m      2.0 27.5       0.98     0.03          6.10      1.30



References
(1) B. V. Kukarkin, P. N. Kholopov, Yu. N. Efremov, N. E. Kurochkin:
	The Second Catalogue of Suspected Variable Stars.
	Moscow, 1965,
(2) R. Weber, JO 42, 106, 1959. [BIBCODE 1959JO.....42..106W ]
(3) A. D. Andrews, I.B.V.S. No. 307, 1968.
(4) A. D. Andrews, P. F. Chugainov, R. E. Gershberg, V. S. Oskanjan
	I.B.V.S. No. 326, 1969.                             




                         N. I. SHAKOVSKAYA
                   Crimean Astrophysical Observatory