Journal ArticleDOI
Pulsation in the lower Cepheid strip. I. Linear survey.
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TLDR
A detailed linear survey of stellar models intended to represent dwarf Cepheids and delta Scuti stars has been calculated in this paper, where growth rates, periods, and other parameters for the first six radial modes are given for models with X=0.7, Z= 0.005, and masses ranging from 0.2M/sub sun/to 2.0M/ sub sun/Abstract:
A detailed linear survey of stellar models intended to represent dwarf Cepheids and delta Scuti stars has been calculated. Growth rates, periods, and other parameters for the first six radial modes are given for models with X=0.7,Z=0.005, and masses ranging from 0.2M/sub sun/ to 2.0M/sub sun/. A complete survey is also presented for the case X=0.7,Z=0.02M=2.0M/sub sun/. Although no mass or mode is excluded, observations are consistent with the simple assumption of post-mainsequence, Population I evolutionary phase in nearly every case (including period ratios). The fourth and fifth overtones are found to be the most unstable modes in most cases; these modes exhibit both blue and red edges consistent with the observed instability strip. The higher-mass models show a pulsational driving zone at 1.5 x 10/sup 5/ K in addition to the usual driving zones at the 1.2 x 10/sup 4/ K (H) and at 5.2 x 10/sup 4/ K (He). This additional driving is generated by an opacity bump due to the second helium ionization edge, and is shown to be most effective in models with small central condensation.read more
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Journal ArticleDOI
Asteroseismic measurement of surface-to-core rotation in a main-sequence A star, KIC 11145123
D. W. Kurtz,Hideyuki Saio,Masao Takata,Hiromoto Shibahashi,Simon J. Murphy,Simon J. Murphy,Takashi Sekii +6 more
TL;DR: In this paper, rotationally split core and surface p-mode triplets and quintuplets were discovered in a terminal age main-sequence A star, KIC 11145123, that shows both δ Sct pmode pulsations and γ Dor g-mode pulsations.
Journal ArticleDOI
KIC 4544587: an eccentric, short-period binary system with δ Sct pulsations and tidally excited modes
Kelly Hambleton,Kelly Hambleton,Kelly Hambleton,D. W. Kurtz,Andrej Prsa,Joyce A. Guzik,Krešimir Pavlovski,Steven Bloemen,John Southworth,Kyle E. Conroy,S. P. Littlefair,Jim Fuller +11 more
TL;DR: In this paper, a short-period eccentric eclipsing binary system with self-excited pressure and gravity modes, tidally excited modes, and tidally influenced p modes and rapid apsidal motion of 182 yr per cycle is presented.
Journal ArticleDOI
Amplitude modulation in δ Sct stars: statistics from an ensemble study of Kepler targets
Dominic M. Bowman,D. W. Kurtz,Michel Breger,Simon J. Murphy,Simon J. Murphy,Daniel Luke Holdsworth +5 more
TL;DR: The results of a search for amplitude modulation of pulsation modes in 983 δ Sct stars, which have effective temperatures between 6400 ≤ Teff ≤ 10 000 K in the Kepler Input Catalogue and were continuously observed by the Kepler Space Telescope for 4 years, were presented in this paper.
Journal ArticleDOI
Contributing factors to flux changes in nonradial stellar pulsations
TL;DR: In this article, a linearized analytic representation of observed flux changes due to nonradial pulsations is examined under conditions applicable to a variety of pulsating star types, and Histograms are presented as a function of l, documenting the relative importance of local temperature, geometry, pressure, and limb-darkening variations.
Journal ArticleDOI
Asteroseismic modelling of the two F-type hybrid pulsators KIC 10080943A and KIC 10080943B
V. S. Schmid,Conny Aerts +1 more
TL;DR: In this article, a model that is able to predict the observed g-mode period spacings and stellar parameters of both components of KIC(10080943) is presented.
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