COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                     Number 2453

                                        Konkoly Observatory
                                        Budapest
                                        27 December 1983

                                        HU ISSN 0374-0676



            VARIABLE STAR TIMINGS FROM ARIZONA



  During 1980-1982, monitoring of several variable stars for polarization
was carried out with the MINIPOL polarimeter at Steward Observatory. Standard
stars were included in the program so that the data yielded photometric monitoring
as well. Eight times of maxima for two Beta Cephei stars (BW Vul and Sigma
Sco) were found this way, as were two times of primary minima of the eclipsing
contact binary W Corvi. In addition, the Johnson UBVRI photometer at Steward
was used to find one maximum of BW Vul, and the UBV photometer at the US Naval
Observatory at Flagstaff was used for one minimum of W Corvi. In all cases

                      Table I
                      Heliocentric Julian Dates
Star                  Hel. JD - 2,440,000       notes
BW Vul (maximum)      4401.8010             MINIPOL B-filter
                      4402.8040             "
                      4403.8110             "
                      4482.8211             "
                      4483.8244             "
                      4484.8298             "
                      4504.7326             U,B,V filters
                      4872.8450             MINIPOL B-filter
Sigma Sco (maximum)   4450.5407             "
W Corvi (primary      4704.8490             "
eclipse minimum)      4718.8215             "
                      5077.7957             B,V filters - USNO

the data were corrected for extinction, differential magnitudes were plotted,
and timings were estimated visually from these plots.



ANDREW P. ODELL       SANTIAGO TAPIA            DAVID H. SMITH
FRANK DORCHAK         WIESLAW Z. WISNIEWSKI     Sky and Telescope
KIM ROGALSKI          Lunar and Planetary Lab   49 Bay State Road
Dept. of Physics      Steward Observatory       Cambridge MA 02238
and Astronomy         University of Arizona     USA
Northern Arizona U.   Tucson, AZ 85721
Flagstaff, AZ 86011   USA
USA