SuperWASP observations of pulsating Am stars

Smalley, B.; Kurtz, D. W.; Smith, A. M. S.; Fossati, L.; Anderson, D. R.; Barros, S. C. C.; Butters, O. W.; Collier Cameron, A.; Christian, D. J.; Enoch, B.; Faedi, F.; Haswell, C. A.; Hellier, C.; Holmes, S.; Horne, K.; Kane, S. R.; Lister, T. A.; Maxted, P. F. L.; Norton, A. J.; Parley, N.; Pollacco, D.; Simpson, E. K.; Skillen, I.; Southworth, J.; Street, R. A.; West, R. G.; Wheatley, P. J. and Wood, P. L. (2011). SuperWASP observations of pulsating Am stars. Astronomy & Astrophysics, 535, article no. A3.

DOI: https://doi.org/10.1051/0004-6361/201117230

Abstract

We have studied over 1600 Am stars at a photometric precision of 1 mmag with SuperWASP photometric data. Contrary to previous belief, we find that around 200 Am stars are pulsating δ Sct and γ Dor stars, with low amplitudes that have been missed in previous, less extensive studies. While the amplitudes are generally low, the presence of pulsation in Am stars places a strong constraint on atmospheric convection, and may require the pulsation to be laminar. While some pulsating Am stars have been previously found to be δ Sct stars, the vast majority of Am stars known to pulsate are presented in this paper. They will form the basis of future statistical studies of pulsation in the presence of atomic diffusion.

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About

• Item ORO ID
• 29893
• Item Type
• Journal Item
• ISSN
• 1432-0746
• Extra Information
• 32 pp
• Keywords
• asteroseismology; chemically peculiar stars; stellar oscillations; variable stars; delta Scuti; photometric techniques
• Academic Unit or School
• Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
  Faculty of Science, Technology, Engineering and Mathematics (STEM)
• Copyright Holders
• © 2011 ESO
• Depositing User
• Andrew Norton