COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                     NUMBER 711

                                  Konkoly Observatory
                                  Budapest
                                  1972 August 31



            PHOTOMETRY OF V1216 SAGITTARII


    During the recent International Co-operative Flare Star
period from the 3rd to 17th July, 1972, observations were made
on V1216 Sgr with the 41cm Reflector at Boyden Observatory,
The detector was a cooled EMI 6256A photomultiplier tube fitted 
with a standard Johnson B filter. The table gives details
of the observations over a total monitoring time of 24h42m.
    Three flares were observed during this period, two of them
being minor flares. Unfortunately adverse weather conditions
prevented more observations.
    The time interval between flares 1 and 2, viz. 48h6.8m
possibly provides some more evidence for the 48h interval 
previously reported for this star (Andrews 1966 and Jarrett and
Eksteen 1969).

               
     Monitoring Data for V1216 Sgr
 
-----------------------------------------------------------------------------
                         Total          UT                  (I_0+f - I_0)/I_0
     July 1972           Hours   Flare  of      Duration      
                          per     No.  Flare     (mins.)   
                         Night  
-----------------------------------------------------------------------------
 3   17h18m    - 19h47m  4h32m
     20 02     - 22 05
 4   17 25     - 20 53   5 22     1   18h47.10m   2.10           0.19
     21 02     - 22 07
     22 14     - 23 03
 5   17 22     - 21 10   3 48
 6   18 39     - 19 03   3 20     2   22 53.85    2.15           0.56
     19 20     - 20 56
     22 37     - 23 57
11   17 08     - 20 10   3 02
17   16 51     - 19 38   4 38     3   22 34.3     1.9            0.29
     22 01     - 23 52
----------------------------------------------------------------------------
                 Total  24h42m                             Mean  0.35


Note: I_0   is the intensity deflection (less sky background) of
            the quiet star.
      I_0+f is the total intensity deflection (less sky
            background) of the star plus flare at maximum.


                     [FIGURE 1]


                 A.H. JARRETT and J.P. EKSTEEN

                 Boyden Observatory,
                 Department of Astronomy,
                 University of the Orange Free State,
                 Bloemfontein.
                 Republic of South Africa.



References:

Andrews, A.D., 1966, P.A.S.P. 73, 542. [BIBCODE 1966PASP...78..542A ]
Jarrett, A.H., and Eksteen, J.P. 1969, MNASSA. 28, 131. [BIBCODE 1969MNSSA..28..131J ]