COMMISSION 27 OF THE I. A. U.
       INFORMATION BULLETIN ON VARIABLE STARS
                   Number 1752

                               Konkoly Observatory
                               Budapest
                               1980 February 28


   PHOTOMETRIC OBSERVATIONS OF THE VARIABLE (?) UV-BRIGHT 
                 STAR K1082 IN M15


We present further observations of K1082 in M15, made to try to confirm the
2-hour variation observed by Chu (1977) and not found by Smith et al. (1979).
Photoelectric magnitudes were obtained by RAS with the 1.3-m reflector at Kitt
Peak, and by MHL with the 1.5-m Catalina reflector (University of Arizona) at
Mt. Lemmon. Photographic magnitudes are from blue plates taken with the 1.5-m
Wyeth reflector of Harvard College Observatory's Agassiz Station. The data are
presented in Table I.

On the nights during which several observations were made, we find no evidence
for a 2-hour variation. There seems, however, to be a possibly significant
difference between mean magnitudes and colors on different nights. The
photographic observations from Agassiz still are about 0.1 mag fainter than
other observations (see Smith et al.); this effect may be due to the much lower
altitude of Agassiz Station as compared to the other sites, combined with the
rather blue color of K1082 compared to the photographic standards.

Thus we suggest that there is currently no short-period variation of K1082, but
variations over periods longer than several hours remain a distinct
possibility.


MARTHA H. LILLER
Harvard-Smithsonian Center for Astrophysics
Cambridge, MA 02138, U.S.A.

ROBERT A. SCHOMMER
Yerkes Observatory
Williams Bay, WI 53191, U.S.A.

References:

Chu, Y.-H. 1977, Chinese Astronomy 1, 302. [BIBCODE 1977ChA.....1..302C ]
Smith, H.A., Millis, A.J., and Liller, M.H. 1979, Publ. Astron. Soc. Pacific
   91, 671. [BIBCODE 1979PASP...91..671S ]


         Table I.  Magnitudes for K1082 in M15

JDHel.            Photoelectric      Photographic    Observatory
2,440,000+     V      B-V        U-B     B
3987.812                               15.37          Agassiz
4022.910     14.98   +.25       +.16                  KPNO
    .921     14.96   +.25                             "
    .931     14.97   +.23                             "
    .942     14.99   +.20                             "
    .952     14.96   +.24       +.21                  "
4023.927     15.00   +.23       +.28                  "
    .933     15.00   +.23                             "
    .949     15.02   +.18       +.23                  "
    .953     15.00   +.23                             '
    .958     15.02   +.21                             "
4048.896     14.92   +.26                             Mt. Lemmon
    .903     14.93   +.26                             "
    .910     14.93   +.25                             "
    .917     14.94   +.25                             "
4049.844     14.94   +.25                             "
    .851     14.93   +.26                             "
    .858     14.94   +.26                             "
    .865     14.93   +.26                             "
    .872     14.93   +.26                             "
    .881     14.92   +.27                             "
    .888     14.94   +.26                             "
    .895     14.93   +.26                             "
    .902     14.93   +.26                             "
    .916     14.92   +.27                             "
    .924     14.93   +.27                             "
4050.757                               15.36          Agassiz
    .838     14.91   +.25                             Mt. Lemmon
    .845     14.91   +.26                             "
    .852     14.92   +.26                             "
    .859     14.92   +.26                             "
    .866     14.92   +.26                             "
    .872     14.89   +.27                             "
4052.717                               15.36          Agassiz
    .736                               15.34          "
4058.715                               15.40          "
    .736                               15.34          "
    .757                               15.30          "
    .777                               15.36          "
4116.673                               15.32          "
    .704                               15.28          "
    .737                               15.30          "
4134.651                               15.34          "
4143.603                               15.34          "
    .631                               15.38          "
    .647                               15.30          "
    .659                               15.34          "
    .686                               15.34          "