SuperWASP observations of pulsating Am stars

B. Smalley*, D. W. Kurtz, A. M. S. Smith, L. Fossati, D. R. Anderson, S. C. C. Barros, O. W. Butters, A. Collier Cameron, D. J. Christian, B. Enoch, F. Faedi, C. A. Haswell, C. Hellier, S. Holmes, K. Horne, S. R. Kane, T. A. Lister, P. F. L. Maxted, A. J. Norton, N. ParleyD. Pollacco, E. K. Simpson, I. Skillen, J. Southworth, R. A. Street, R. G. West, P. J. Wheatley, P. L. Wood

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

43 Citations (Scopus)

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 delta Sct and gamma 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 delta 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.

Original languageEnglish
Article number3
Number of pages32
JournalAstronomy and Astrophysics
Volume535
DOIs
Publication statusPublished - Nov 2011

Keywords

  • asteroseismology
  • stars: chemically peculiar
  • stars: oscillations
  • stars: variables: delta Scuti
  • techniques: photometric
  • ATMOSPHERIC VELOCITY-FIELDS
  • DELTA-SCUTI
  • KEPLER OBSERVATIONS
  • PRAESEPE CLUSTER
  • GAMMA-DORADUS
  • MAIN-SEQUENCE
  • METALLICISM
  • OSCILLATIONS
  • DISCOVERY
  • CATALOG

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