λ Bootis stars in the SuperWASP survey

Paunzen, E.; Skarka, M.; Walczak, P.; Holdsworth, D.L.; Smalley, B.; West, R.G.; Janík, J.

Abstract

We have analysed around 170 000 individual photometric WASP (Wide Angle Search for Planets) measurements of 15 well-established ? Bootis stars to search for variability. The ? Bootis stars are a small group of late-B to early-F, Pop I, stars that show moderate to extreme (surface) underabundances (up to a factor 100) of most Fe-peak elements, but solar abundances of lighter elements (C, N, O and S). They are excellent laboratories for the study of fundamental astrophysical processes such as diffusion, meridional circulation, stellar winds and accretion in the presence of pulsation. From the 15 targets, 8 are variable and 7 are apparently constant with upper limits between 0.8 and 3.0 mmag. We present a detailed time-series analysis and a comparison with previously published results. From an asteroseismologic study, we conclude that the found chemical peculiarities are most probably restricted to the surface.

Citation

Paunzen, E., Skarka, M., Walczak, P., Holdsworth, D., Smalley, B., West, R., & Janík, J. (2015). λ Bootis stars in the SuperWASP survey. Monthly Notices of the Royal Astronomical Society, 453(2), 1241 -1248. https://doi.org/10.1093/mnras/stv1652

• Journal Article Type: Article
• Acceptance Date: Jul 20, 2015
• Online Publication Date: Aug 24, 2015
• Publication Date: Oct 21, 2015
• Publicly Available Date: May 26, 2023
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Publisher: Oxford University Press
• Peer Reviewed: Peer Reviewed
• Volume: 453
• Issue: 2
• Pages: 1241 -1248
• DOI: https://doi.org/10.1093/mnras/stv1652
• Keywords: techniques photometric, stars, chemically peculiar, variables, d Scuti
• Publisher URL: http://dx.doi.org/10.1093/mnras/stv1652