COMMISSIONS 27 AND 42 OF THE IAU
             INFORMATION BULLETIN ON VARIABLE STARS
                          Number 3878

                                            Konkoly Observatory
                                            Budapest
                                            13 May 1993

                                            HU ISSN 0374 - 0676


                   A STUDY OF FOUR RED STARS


We have studied four variable stars on photographs taken with the 40 cm
astrograph of the Sternberg Institute Crimean Laboratory. The discoverer of
each star, the number of estimated plates and the time interval covered are
indicated in Table I.

Table I
Name        Reference                 Type           Observational interval

AM Lac      Hoffmeister (1928)           M           45642-47826        109
BX Lac      Hoffmeister (1929)           M           45642-47851        102
KW Lac      Miller and Wachmann (1971)   SRb:        45642-48532         98
NSV 14200   Morgenroth (1934)            -           45642-48532        121

The finding charts are shown in Figure 1. The magnitudes of comparison stars
for KW Lac were taken from Miller and Wachmann (1971), and for the rest of the
stars we have measured them with the iris photometer of the Variable Star
Department, Sternberg Institute (see Table III).

We have reduced the observations on a PC. The main results are given in Table
II.


                             [FIGURE 1]

        Figure 1. The finding charts of the programme stars.

                             [FIGURE 2]

 Figure 2. The mean light curve of the stars studied. Uncertain observations
 are shown as open circles.


                             Table II

Name        Type     Max       Min     J.D. max   Period   Sp
AM Lac      M        12.2m     (18m    46722      313.4    M5
BX Lac      M        13.7      17.6    46413      448.2    M10
KW Lac      SRa      14.6      16.3    45675      206.0    ?
NSV 14200   SRb      13.5      14.6    45649      114.8    M6

       Remark: The spectral types are given from the literature.

                Table III

Name   AM Lac      BX Lac   KW Lac   NSV14200
a      12.20m      12.83m   14.56m   13.18
b      13.80       13.90    14.84    13.77
c      14.51       14.45    15.07    14.34
d      15.11       14.95    15.15    14.72
e      15.86       15.18    15.43     -
f      17.9        15.85    15.87     -
g                  15.96    16.28     -
h      -           16.48     -        -
k      -           17.14     -        -



                         S. Yu. SHUGAROV
                         Sternberg Astronomical
                         Institute
                         A. V. SAVENKOV
                         Moscow Palace of Children
                         and Youth Creative Activity,
                         Department of Astronomy and
                         Astronautics
                         Moscow, Russia

References:

Hoffmeister, C., 1928, Astron. Nachrichten, 232, 153 [BIBCODE 1928AN....232..153H ]
Hoffmeister, C., 1929, Astron. Nachrichten, 236, 242 [BIBCODE 1929AN....236..233H ]
Morgenroth, O., 1934, Astron. Nachrichten, 251, 19 [BIBCODE 1934AN....251...17M ]
Miller, W., Wachmann, A. A., 1971, Specola Astronomica Vaticana Richerche
   Astronomiche, 8, No. 12 [BIBCODE 1971RA......8...12M ]