COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                    Number 1849

                                   Konkoly Observatory
                                   Budapest
                                   1980 September 29

                                   HU ISSN 0374-0676




      OPTICAL VARIABILITY OF THE RS CVn CANDIDATE HD 174429





The star HD 174429 is included in the southern RS CVn systems candidate
list of Weiler and Stencel (1979), and radial velocity measurements on it
are given by Stacy et al.(1980).

Using a photoelectric photometer with Monash University's 40-cm Newtonian
telescope we have measured 85 values of V for this star on 9 nights in the
interval 1980, July 23 to September 16.  We find that the star is a variable
having an approximately sinusoidal light curve with a period 0.942 +- 0.002
day, and a magnitude range of 0.10 +- 0.02.

                         [FIGURE 1]

Light curve of HD 174429. Delta V is relative to SAO 245894, and 
the phase is of the estimated period 0.942 day.

The graph below shows magnitude difference from the comparison star SAO 2458
versus phase of the estimated period, using primary epoch J.D. 2444443.0000.
Check stars used were HD 172223 and SAO 245899. Incidentally our measurements 
indicate that HD 172223 was constant in V within the accuracy of our
measurements (0.005 magnitude) during the period concerned, which does not
support the suspicion of Cousins et al.(1966) that it is a variable with a
range of about 0.06 magnitude in V.

We are preparing a fuller account of this work for publication elsewhere.







     D.W. COATES, L. HALPRIN, P. SARTORI, K. THOMPSON

               Department of Physics,
               Monash University,
               Clayton, Victoria 3168,
               Australia.








References:

Cousins, A.W.J., Lake, R., and Stoy, R.H., 1966, Royal Observatory Bulletins
    No. 121. [BIBCODE 1966RGOB..121....1C ]
Stacy, J.G., Stencel, R.E., and Weiler, E.J., 1980, Astron. J., 85, 858. [BIBCODE 1980AJ.....85..858S ]
Weiler, E.J., and Stencel, R.E., 1979, Astron. J., 84, 1372. [BIBCODE 1979AJ.....84.1372W ]