COMMISSION 27 OF THE I. A. U.
          INFORMATION BULLETIN ON VARIABLE STARS
                      Number 1893

                                   Konkoly Observatory
                                   Budapest
                                   1980 December 18

                                   HU ISSN 0374-0676



           SEARCH FOR AN ECLIPSE OF HR 913



   The star HR 913 was discovered by R.F. Griffin (1980) to be
a double-lined spectroscopic binary with a period of 363.10 days.
Griffin gives the spectral types of the components to be F8 V and
G5 V. He predicts the possibility of an eclipse on 1980 September
30.8 (JD 2444513.3) with an uncertainty of 0.5 days. The duration
of a central eclipse would also be about half a day.
   The author searched for the eclipse on four nights with the
No. 4 16-inch telescope at Kitt Peak National Observatory. Differential 
V and B photometric observations were obtained using
rho^1 Eri as a comparison star. The observations were corrected fr 
differential atmospheric extinction and transformed to the standard 
UBV system. The observations are shown in the Table below.


                    TABLE

Hel. J.D.   Delta V  Delta B
(2440000+)
4510.9288    0.443   -0.007
4510.9329    0.441   -0.006
4510.9370    0.438   -0.008
4511.8762    0.442
4511.8793    0.436
4512.8284    0.442
4512.9340    0.446
4513.7986    0.439
4513.9442    0.443
4513.9544    0.447   0.002
4513.9592    0.447   0.000
4513.9937    0.439  -0.005


The data bracket the predicted time of eclipse and show no evidence 
of an eclipse. However, a 0.5 day eclipse very close to the
predicted time would have occurred entirely between the last observation 
obtained on JD 2444512 and the first observation on JD
2444513 and, hence, would not have been observable from the longitude 
of Kitt Peak.
    The author acknowledges that this work was supported in part
by N.A.S.A. research grant NSG-7543.



                            GREGORY W. HENRY *
                            Dyer Observatory
                          Vanderbilt University
                        Nashville, Tennessee 37235


Reference:
Griffin, R.F., 1980, The Observatory 100,113 [BIBCODE 1980Obs...100..113G ]


*Guest Investigator, Kitt Peak National Observatory, which is
operated by the Association of Universities for Research in Astronomy, 
under contract with the National Science Foundation.