COMMISSIONS 27 AND 42 OF THE IAU
              INFORMATION BULLETIN ON VARIABLE STARS
                           Number 4047

                                                Konkoly Observatory
                                                Budapest
                                                7 July 1994
                                                HU ISSN 0374 - 0676

               NEW FLARE STARS IN THE REGION OF
                    OPHIUCHUS AND SCORPIUS


  The first four flare stars in the recent star formation region of rho Ophiuchi were found
by Haro & Chavira (1974), based on effective observational time equal to 43 hours. The
same region was observed on Tonantzintla 26" Schmidt telescope during 1975-1983. Four
new flare stars were found again. Total observational time was equal to 149h.
  In Table 1 data on the new flare stars are given. Columns first to sixth give the serial
number of flare star, approximate coordinates (error in R.A. +/-5s, in Dec. +/-9"), ultraviolet
magnitude at minimum, flare amplitude and date of flare respectively.


                           [FIGURE 1]

 Figure 1. Identification charts for the new flare stars. North is at
 the top, East is to the right. The size of the chart is 12 x 12 arc min.


Table 1. New flare stars in Ophiuchus and Scorpius
No. Ton.   R.A.         Dec.       U     DeltaU    Date
           1950         1950      mag     mag    of flare
           h  m         d  ' 
5          16 22.8     -23 12     >18    >2.9   09.06.1980
6          16 23.3     -23 37     >18    >2.3   05.07.1978
7          16 25.7     -25 48     >18    >2.4   06.04.1976
8          16 33.1     -26 12     >18    >6     15.05.1975

  Flare of star No.8 was probably a superposition of two fast flares occurring within a
time interval of about 30 minutes. The first flare began a little earlier than 5h22m with
amplitude >=3m, then at 5h54m or a little earlier the second fast flare took place, with an
amplitude of >=6m. Another possibility is to suppose that it was a slow flare, but the
shape of light, curve is in favour of the first, assumption. The data on flare of the star No.
8 are given in Table 2.


         Table 2
UT     m_u      UT     m_u
h m      m      h m      m
5 22   15.0     6 41   14.5
5 38   15.5     7 00   14.8
5 54   12.0     7 16   15.6
6 10   12.5     7 32   16.0
6 25   13.5     7 48   16.5

 This star has Halpha in emission (Wilking et al., 1987).
 Thus, during 192 hours of observations, only 8 flare stars were found in the region of
Ophiuchus and Scorpius. In Figure 1 the identification maps of the newly found flare
stars are given.
 We thank C. Escamilla for technical help.


                          Elma S. PARSAMIAN
                          Byurakan Observatory, Armenia
                          INAOE, Mexico

                          Enrique CHAVIRA
                          Graciela GONZALEZ
                          INAOE, Mexico



References:
Haro, G. and Chavira, E., 1974, Bol. Inst. Tonantzintla, 1, 189 [BIBCODE 1974BITon...1..189H ]
Wilking, B. A., Schwartz, R. D., Blackwell, J. H., 1987, Astron. J., 94, 106 [BIBCODE 1987AJ.....94..106W ]