Pulsation versus metallicism in Am stars as revealed by LAMOST and WASP
Article
Article Title | Pulsation versus metallicism in Am stars as revealed by LAMOST and WASP |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Smalley, B. (Author), Antoci, V. (Author), Holdsworth, D. L. (Author), Kurtz, D. W. (Author), Murphy, S. J. (Author), De Cat, P. (Author), Anderson, D. R. (Author), Catanzaro, G. (Author), Collier Cameron, A. (Author), Hellier, C. (Author), Maxted, P. F. L. (Author), Norton, A. J. (Author), Pollacco, D. (Author), Ripepi, V. (Author), West, R. G. (Author) and Wheatley, P. J. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 465 (3), pp. 2662-2670 |
Number of Pages | 9 |
Year | 2016 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stw2903 |
Web Address (URL) | https://academic.oup.com/mnras/article/465/3/2662/2454762 |
Abstract | We present the results of a study of a large sample of A and Am stars with spectral types from Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) and light curves from Wide Area Search for Planets (WASP). We find that, unlike normal A stars, δ Sct pulsations in Am stars are mostly confined to the effective temperature range 6900 < Teff < 7600 K.We find evidence that the incidence of pulsations inAmstars decreases with increasingmetallicism (degree of chemical peculiarity). The maximum amplitude of the pulsations in Am stars does not appear to vary significantly with metallicism. The amplitude distributions of the principal pulsation frequencies for both A and Am stars appear very similar and agree with results obtained from Kepler photometry. We present evidence that suggests turbulent pressure is the main driving mechanism in pulsating Am stars, rather than the κ-mechanism, which is expected to be suppressed by gravitational settling in these stars. |
Keywords | Asteroseismology; Stars: chemically peculiar; Stars: oscillations; Stars: variables: d Scuti; Techniques: photometric; Astrophysics - Solar and Stellar Astrophysics |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | Keele University, United Kingdom |
Aarhus University, Denmark | |
University of Central Lancashire, United Kingdom | |
University of Sydney | |
Royal Observatory of Belgium | |
National Institute for Astrophysics, Italy | |
University of St Andrews, United Kingdom | |
Open University, United Kingdom | |
University of Warwick, United Kingdom | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q73w4/pulsation-versus-metallicism-in-am-stars-as-revealed-by-lamost-and-wasp
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