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

Volume 41 number 2 (2013)

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David J. W. Moriarty
315 Main Road, Wellington Point, Queensland 4160, Australia; send email correspondence to djwmoriarty@bigpond.com
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

Abstract

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.