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Discovery of Pulsating Components in the Southern Eclipsing Binary Systems AW Velorum, HM Puppis, and TT Horologii


David J. W. Moriarty

315 Main Road, Wellington Point, Queensland 4160, Australia

Terry Bohlsen

Mirranook, Armidale, NSW 2350, Australia

Bernard Heathcote

269 Domain Road, South Yarra, Victoria 3141, Australia

Tom Richards

P.O. Box 323, Kangaroo Ground, Victoria 3097, Australia

Margaret Streamer

3 Lupin Place, Murrumbateman, NSW 2582, Australia

Received June 4, 2013; revised July 15, 2013; accepted August 6, 2013


Eclipsing binary stars with pulsating components are especially valuable for studies of stellar evolution. We have discovered that three eclipsing binary stars in the southern sky have a pulsating component with oscillations similar to those of delta Scuti stars. The systems are: AW Velorum, HM Puppis, and TT Horologii. Their spectral types were determined as A7 for AW Vel and HM Pup and F0-F2 for TT Hor. The dominant pulsation frequencies are 15–38 cycles per day with amplitudes of 10–60 millimagnitudes.

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