Journal Article

Pulsational amplitude growth of the star KIC 3429637 (HD 178875) in the context of Am and ρ Pup stars

Simon J. Murphy, A. Grigahcène, E. Niemczura, D. W. Kurtz and K. Uytterhoeven

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 427, issue 2, pages 1418-1428
Published in print December 2012 | ISSN: 0035-8711
Published online December 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.22062.x
Pulsational amplitude growth of the star KIC 3429637 (HD 178875) in the context of Am and ρ Pup stars

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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: HD 178875; stars: oscillations; stars: variables: δ Scuti

Journal Article.  8404 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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