AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 75. The Binary Star Community
Display, Wednesday, June 2, 1999, 10:00am-6:30pm, Southeast Exhibit Hall

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[75.05] Observations of 44i Bootis

C. Jurgenson (Lewis \& Clark College), M. E. Price (Lakeridge HS, Lake Oswego, OR), M. Pereira, D. MacInnes, H. B. Snodgrass (Lewis \& Clark College)

Seven times of minimum were obtained for the W Ursae Majoris type system 44i Bootis; three primary and four secondary. These observations were taken using a 10-inch Newtonian reflector and 1P21 photomultiplier at Lewis & Clark College. Our times of minimum are used with previously observed minimum times for plotting an (o-c) curve to generate a function that describes how the system's ~ 6.5 hr. period is changing over time. After applying a parabolic least squares fit to the (o-c) curve we obtain a quadratic function F(E), where E is the eclipse number. Adding this to the 1991 ephemeris of Oprescu, we obtain a corrected non-linear ephemeris JD 2443604.5919 + 0.26781665 E + 5.9 x10-11 E2. From this we find, in agreement with past observations, that the period of 44i Bootis is increasing over time, and determine the rate of increase. This work was supported by Partners in Science Grant HS0485, an M. J. Murdock Charitable Trust Award of Research Corporation.

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