Pulsational amplitude growth of the star KIC 3429637 (HD 178875) in the context of Am and ρ Pup stars
Article
Article Title | Pulsational amplitude growth of the star KIC 3429637 (HD 178875) in the context of Am and ρ Pup stars |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Murphy, Simon J. (Author), Grigahcene, A. (Author), Niemczura, E. (Author), Kurtz, D. W. (Author) and Uytterhoeven, K. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 427 (2), pp. 1418-1428 |
Number of Pages | 11 |
Year | 2012 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1111/j.1365-2966.2012.22062.x |
Web Address (URL) | https://academic.oup.com/mnras/article/427/2/1418/976477 |
Abstract | KIC 3429637 (HD 178875) is a δ Sct star whose light curve shows continuous pulsational amplitude growth in Kepler mission photometry. Analysis of the three largest amplitude peaks in the Fourier transform indicates different growth rates for all three. We have ruled out instrumental causes, and determine the amplitude growth to be intrinsic to the star. We calculate time-dependent convection models and compare them with the observations. We confirm earlier characterizations that KIC 3429637 is a marginal Am star through the analysis of new spectroscopic data. With the data presently available, a plausible cause of the amplitude growth is increasing pulsational driving as evolutionary changes shift the He II driving zone deeper in this ρ Puppis star. If this model is correct, then we are watching real-time stellar evolutionary changes. |
Keywords | Stars: chemically peculiar; Stars: individual: HD178875; Stars: oscillations; Stars: variables: δScuti; 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 ©: 2012 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | University of Central Lancashire, United Kingdom |
University of Porto, Portugal | |
Wroclaw University, Poland | |
Institute of Astrophysics of the Canary Islands, Spain | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q73q8/pulsational-amplitude-growth-of-the-star-kic-3429637-hd-178875-in-the-context-of-am-and-pup-stars
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