COMMISSION 27 OF THE I. A. U.
       INFORMATION BULLETIN ON VARIABLE STARS
                   Number 1323

                                     Konkoly Observatory
                                     Budapest
                                     1977 August 11


        DUPLICITY AND SPECTRAL TYPES OF HV 10814



   HV 10814 = CSV 2851 was discovered by Swope (Harv. Ann. 109, no. 9,
1943), who remarked: "there is variation in median magnitude during a
season, with rapid variations superposed". Sanduleak and Stephenson
(IBVS no. 770, 1973) found that the spectral type was dM3e, with H and
Ca II emission. Busko, Quast and Torres (IBVS no. 1275, 1977) discovered
that the star varied sinusoidally in light over a range of DeltaB=0.15 mag.
with, tentatively, a period of 2.69 days.

   The star was observed on 1977 July 7 at the coude focus of the Lick
120-inch reflector, and was found to be in fact a visual double. The
separation was estimated as about 3" in p.a. 200degree, with Delta m = 1-2 mag.
Slit spectrograms (dispersion 34 Angstrom/mm, covering the yellow-red region)
of the individual stars show that the brighter component is type M3e V, in
agreement with Sanduleak and Stephenson; Halpha is a strong, narrow emission
line and the He I lines lambdalambda5875,6678 are weakly in emission. The fainter
component is M4e V, with narrow bright Halpha but without He I emission. The
radial velocity determined from the single spectrogram of star A is
-18 km/sec, while B was measured as -28 km/sec . Experience with
velocities measured on such plates indicates that the standard deviation
of one of these velocities is about 4 km/sec , so that a common velocity
for the pair is not ruled out. It is not apparent which star is the
variable.

                               G. H. HERBIG
                               Lick Observatory
                               University of California
                               Santa Cruz, California 95064, U.S.A.