COMMISSION 27 OF THE I.A.U.
               INFORMATION BULLETIN ON VARIABLE STARS
                            Number 1447

                                                      Konkoly Observatory
                                                      Budapest
                                                      1978 July 3


    NEW Halpha-EMISSION STARS IN THE REGION OF NGC 7000

During July and August 1977 the search for Halpha-emission
stars in the region of NGC 7000 was continued with the 40"/52"
Schmidt-telescope of the Byurakan Astrophysical Observatory.
   Ten spectral plates have been obtained by a 4 deg objective
prism (275 A/mm at Halpha) on Kodak II F emulsion through an RG 610
filter. The exposure times were between 20 sec and 100 min. In
order to reach the highest limiting magnitude the spectra were
not widened. The plates were hipersensitized by baking in dry air
from 56dC to 70dC during 12 - 14 hours according to the method of
Stepanian and Amirhanian (1977). The average limiting magnitude
was about 19m (pg) for the exposure time of 60 min.
   19 new Halpha-emission stars have been found which were not on
the lists of Merrill and Burwell (1949, 1950), Herbig (1958),
Welin (1973) and Tsvetkov (1975).
   The data of observed new Halpha-emission stars are presented in
Table 1.


                       Table I

Designation    RA (1950.0) D      B_p    I_Halpha


1            20h41.0m   41d11'    14.8m      3
2               41.2    43 13     19.1       4
3               41.4    42 36     18.3       3
4               42.9    43 44     14.5       4
5               44.9    41 48     16.1       2
6               47.0    43 32     20.5:      4
7               47.0    43 40     18.1       5
8               47.4    41 30     14.0       2
9               48.4    43 31     17.3       3
10              49.0    44 40     20.5:      4
11              49.6    44 02     20.5:      9
12              50.4    42 01     15.8       4
13              50.9    42 54     15.0       3
14              51.0    94 14     15.3       3
15              51.4    43 33     19.0       4
16              53.0    43 59     19.4       3
17              53.0    44 01     17.6       3
18              56.5    43 42     19.7       3
19              58.6    41 24     19.6       4

Column 1: Serial numbers of Halpha-emission stars.

Columns 2 and 3: Coordinates for 1950.0.

Column 4: Photographic magnitudes measured on the POSS blue
       prints (Bp) according to the method of stellar diameters.

Column 5: Intensity of Halpha-line in emission: 5-very strong,
       4-strong, 3-medium, 2-weak.


   The Halpha-emission star No 1 in this list was discovered by
Tsvetkov et al. (1975) as a flare star No. B19.
   A more detailed study including the identification charts
of the Halpha-emission stars discovered will be published later on.
   The authors thank Prof. L.V. Mirzoyan and Dr. M.D. Popova
for helpful discussions and Mr. A. Amirhanian for the aid in the
observations.


                  M.K. TSVETKOV, K.P. TSVETKOVA

                     Department of Astronomy
                  Bulgarian Academy of Sciences



References:

Herbig, G.: 1958, ApJ. 128, 259. [BIBCODE 1958ApJ...128..259H ]
Merrill, P.W., Burwell, C.G.: 1949, ApJ, 110, 387. [BIBCODE 1949ApJ...110..387M ]
Merrill, P.W., Burwell, C.G.: 1950, ApJ, 112, 72. [BIBCODE 1950ApJ...112...72M ]
Stepanian, J.A., Amirhanian, A.S.: 1977 (private communication)
Tsvetkov, M.K.: 1975, Astrofizika, 11, 579. [BIBCODE 1975Afz....11..579T ]
Tsvetkov, M.K., Erastova, L.K., Tsvetkova, K.P.: 1975, IBVS, No. 1002.
Welin, G.: 1973, Astron. Astrophys. Suppl. 9, 183. [BIBCODE 1973A&AS....9..183W ]