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High frequency A-type pulsators discovered using SuperWASP

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arxiv 1401.3199 v1 pith:TEJUR4KR submitted 2014-01-14 astro-ph.SR

High frequency A-type pulsators discovered using SuperWASP

Daniel L. Holdsworth , B. Smalley , M. Gillon , K. I. Clubb , J. Southworth , P. F. L. Maxted , D. R. Anderson , S. C. C. Barros
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A. Collier Cameron L. Delrez F. Faedi C. A. Haswell C. Hellier K. Horne E. Jehin A. J. Norton D. Pollacco I. Skillen A. M. S. Smith R. G. West P. J. Wheatley
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classification astro-ph.SR
keywords starspulsationsamplitudesdeltafrequencyhighphotometricscuti
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We present the results of a survey using the WASP archive to search for high frequency pulsations in F-, A- and B-type stars. Over 1.5 million targets have been searched for pulsations with amplitudes greater than 0.5 millimagnitude. We identify over 350 stars which pulsate with periods less than 30 min. Spectroscopic follow-up of selected targets has enabled us to confirm 10 new rapidly oscillating Ap stars, 13 pulsating Am stars and the fastest known $\delta$ Scuti star. We also observe stars which show pulsations in both the high-frequency domain and in the low-frequency $\delta$ Scuti range. This work shows the power of the WASP photometric survey to find variable stars with amplitudes well below the nominal photometric precision per observation.

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Cited by 1 Pith paper

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  1. Study of photometric and spectral variability of the roAp star HD~210684

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    Observational analysis of HD210684 yields rotational period 5.02188 d, magnetic obliquity 77°, and main-sequence age ~1.45 Gyr from photometry, LSD magnetic measurements, and MESA/GYRE modeling.