COMMISSION 27 OF THE I.A.U.
              INFORMATION BULLETIN ON VARIABLE STARS
                           Number 1214

                                             Konkoly Observatory
                                             Budapest
                                             1976 December 7


       ECLIPSING BINARIES FOUND SPECTROSCOPICALLY
                   III. HD 199497

In the two previous papers of this series (Bond 1970,
1975), the writer has shown that eclipsing binaries of the
W Ursae Majoris type show diffuse lines on moderate-dispersion
spectrograms. Hence it has proven possible to discover new
members of the W UMa class purely from their appearance on
objective-prism plates.
   The writer noted HD 199497 (1900 position: 20h52m5,+19deg15',
HD spectral type G5) as having diffuse spectral lines on a plate
obtained in 1966 with the Michigan Curtis Schmidt telescope and
a 10deg objective prism. During October 1975 and April 1976, 24
photoelectric observations of HD 199497 were made with 41- and
61-cm telescopes at Kitt Peak National and Cerro Tololo Interamerican 
Observatories. For convenience, the y filter of the
Stromgren four-colour system was used, and the nearby K-type
star HD 199549 was chosen as comparison star.
   These observations showed that HD 199497 is indeed a new
W UMa-type eclipsing system, with a range of 0.15 mag. The 
following ephemeris was found:

          JD_hel (primary minimum) = 2442687.418+0.3638d E.

   The light curve obtained with these elements is shown in Fig. 1.
The magnitude difference in the y band is in the sense variable
minus comparison, and the conversion to V magnitudes of the variable 
star is shown on the right-hand side of the figure.
   Two further F- or G-type stars showing diffuse lines on
Curtis Schmidt objective-prism plates, CD -33deg362 (1900: 0h54.m4,
-32deg59') and HD 114726 (1900: 13h07.m3, +3deg13') were also 
monitored photoelectrically. Magnitude ranges of 0.05 mag were found
for both stars. Because of the small amplitudes and  marginal
weather conditions under which some of the observations were
made, the writer was unable to find the periods for these stars'
variations. The writer will supply the individual observations
of these three stars to anyone requesting them.


                      [FIGURE 1]

    Light curve for the new eclipsing binary HD 199497.


                              HOWARD E. BOND *

                         Department of Physics and
                         Astronomy, Louisiana State
                         University, Baton Rouge,
                         Louisiana U.S.A.



References:

Bond, H.E. 1970, P.A.S.P., 82, 1065 [BIBCODE 1970PASP...82.1065B ]
Bond, H.E. 1975, P.A.S.P., 87, 877 [BIBCODE 1975PASP...87..877B ]


* Visiting Astronomer, Kitt Peak National and Cerro Tololo
  Interamerican Observatories, which are operated by the Association
  of Universities for Research in Astronomy, Inc., under
  contract with the U. S. National Science Foundation.