AAS 202nd Meeting, May 2003
Session 8 Binary Stars
Poster, Monday, May 26, 2003, 9:20am-6:30pm, West Exhibit Hall

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[8.03] Light Travel Time Effects in the 44i Bootis System

W.T. Ryle, R.F. Gelderman (Western Kentucky University)

Reports of multiple period variations in the 44i Bootis contact eclipsing binary system have prompted a number of investigators to create models to explain the changes (Lucy, L.B., 1976 ApJ 205, 208). It appears however, that at least some of these studies fail to take into account the fact that 44i Boo is actually a tertiary system, with the contact eclipsing binary in orbit with 44i Boo A (Hill, Holmgren & Fisher, 1989 Astron. Astrophy. 211, 81-98). Before a complete analysis can be made, it is essential to assure the data and timings behind the ephemeris take into account every detail of the orbit in question. Many of the past O-C values for the 44i Boo system have not considered the light travel time effects produced by the orbit of the contact eclipsing binary around the primary star. Using the established orbital parameters and past ephemerides, we will display the process involved in light travel time corrections and their implications toward the current models for this system. Work was funded by the Kentucky Space Grant Consortium.

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Bulletin of the American Astronomical Society, 35 #3
© 2003. The American Astronomical Soceity.