Relationship between low and high frequencies in δ scuti stars: Photometric kepler and spectroscopic analyses of the rapid rotator KIC8054146

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DOIResolve DOI: http://doi.org/10.1088/0004-637X/759/1/62
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TypeArticle
Journal titleThe Astrophysical Journal
ISSN0004-637X
Volume759
Issue1
Article number62
AbstractTwo years of Kepler data of KIC8054146 (δSct/γDor hybrid) revealed 349 statistically significant frequencies between 0.54 and 191.36cyclesday -1 (6.3μHz to 2.21mHz). The 117 low frequencies cluster in specific frequency bands, but do not show the equidistant period spacings predicted for gravity modes of successive radial order, n, and reported for at least one other hybrid pulsator. The four dominant low frequencies in the 2.8-3.0cyclesday -1 (32-35μHz) range show strong amplitude variability with timescales of months and years. These four low frequencies also determine the spacing of the higher frequencies in and beyond the δSct pressure-mode frequency domain. In fact, most of the higher frequencies belong to one of three families with spacings linked to a specific dominant low frequency. In the Fourier spectrum, these family regularities show up as triplets, high-frequency sequences with absolutely equidistant frequency spacings, side lobes (amplitude modulations), and other regularities in frequency spacings. Furthermore, within two families the amplitude variations between the low and high frequencies are related. We conclude that the low frequencies (gravity modes, rotation) and observed high frequencies (mostly pressure modes) are physically connected. This unusual behavior may be related to the very rapid rotation of the star: from a combination of high- and low-resolution spectroscopy we determined that KIC8054146 is a very fast rotator (υ sin i=300±20km s -1) with an effective temperature of 7600±200K and a surface gravity log g of 3.9±0.3. Several astrophysical ideas explaining the origin of the relationship between the low and high frequencies are explored. © 2012. The American Astronomical Society. All rights reserved.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Herzberg Institute of Astrophysics (HIA-IHA)
Peer reviewedYes
NPARC number21269333
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Record identifierb11bb3a0-72de-4495-9d1b-7bfe3e0c68f6
Record created2013-12-12
Record modified2016-07-18
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