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λ Bootis stars in the SuperWASP survey
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Paunzen, E., Skarka, M., Walczak, P., Holdsworth, D. L., Smalley, B., West, Richard G. and Janík, J. (2015) λ Bootis stars in the SuperWASP survey. Monthly Notices of the Royal Astronomical Society, 453 (2). pp. 1241-1248. doi:10.1093/mnras/stv1652 ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1093/mnras/stv1652
Abstract
We have analysed around 170 000 individual photometric WASP (Wide Angle Search for Planets) measurements of 15 well-established λ Bootis stars to search for variability. The λ 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.
Item Type: | Journal Article | ||||||||
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Alternative Title: | Lambda Bootis stars in the SuperWASP survey | ||||||||
Subjects: | Q Science > QB Astronomy | ||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
Library of Congress Subject Headings (LCSH): | Stars | ||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||
Publisher: | Oxford University Press | ||||||||
ISSN: | 0035-8711 | ||||||||
Official Date: | 24 August 2015 | ||||||||
Dates: |
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Volume: | 453 | ||||||||
Number: | 2 | ||||||||
Page Range: | pp. 1241-1248 | ||||||||
DOI: | 10.1093/mnras/stv1652 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Date of first compliant deposit: | 6 July 2016 | ||||||||
Date of first compliant Open Access: | 6 July 2016 | ||||||||
Funder: | Queen's University of Belfast, University of Keele, University of St. Andrews, University of Warwick, University of Leicester, Open University, Isaac Newton Trust, Instituto de Astrofísica de Canarias, South African Astronomical Observatory (SAAO), Science and Technology Facilities Council (Great Britain) (STFC), European Union (EU), Jihomoravský kraj (Czech Republic), Österreichischer Austauschdienst (OeAD), Narodowe Centrum Nauki (NCN), Wrocławskie Centrum Sieciowo-Superkomputerowe (WCSS) | ||||||||
Grant number: | 3SGA5916 (SoMoPro), GA CR 7AMB12AT003, LH14300, BG-03/2013 (OeAD), CZ-09/2014 (OeAD), DEC-2013/08/S/ST9/00583 (NCN) |
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