High-frequency A-type pulsators discovered using SuperWASP(star)dagger

Holdsworth, Daniel L.; Smalley, Barry; Gillon, M.; Clubb, K. I.; Southworth, John; Maxted, Pierre F. L.; Anderson, D. R.; Barros, S. C. C.; Collier Cameron, A.; Delrez, L.; Faedi, F.; Haswell, C. A.; Hellier, Coel; Horne, K.; Jehin, E.; Norton, A. J.; Pollacco, D.; Skillen, I.; Smith, A. M. S.; West, R. G.; Wheatley, P. J.

Abstract

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 d Scuti star. We also observe stars which show pulsations in both the high-frequency domain and the low-frequency d 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.

Citation

Holdsworth, D. L., Smalley, B., Gillon, M., Clubb, K. I., Southworth, J., Maxted, P. F. L., …Wheatley, P. J. (2014). High-frequency A-type pulsators discovered using SuperWASP(star)dagger. Monthly Notices of the Royal Astronomical Society, 439(2), 2078 - 2095. https://doi.org/10.1093/mnras/stu094

• Journal Article Type: Article
• Acceptance Date: Jan 13, 2014
• Online Publication Date: Feb 15, 2014
• Publication Date: Apr 1, 2014
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Publisher: Oxford University Press
• Peer Reviewed: Peer Reviewed
• Volume: 439
• Issue: 2
• Pages: 2078 - 2095
• DOI: https://doi.org/10.1093/mnras/stu094
• Keywords: asteroseismology; photometric; surveys; chemically peculiar; oscillations; variables
• Publisher URL: https://doi.org/10.1093/mnras/stu094