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Fourier analysis of non-Blazhko ab-type RR Lyrae stars observed with the Kepler space telescope | J.M.Nemec
; R.Smolec
; J.M.Benko
; P.Moskalik
; K.Kolenberg
; R.Szabo
; D.W.Kurtz
; S.Bryson
; E.Guggenberger
; M.Chadid
; Y.-B.Jeon
; A.Kunder
; A.C.Layden
; K.Kinemuchi
; L.L.Kiss
; E.Poretti
; J.Christensen-Dalsgaard
; H.Kjeldsen
; D.Caldwell
; V.Ripepi
; A.Derekas
; J.Nuspl
; F.Mullally
; S.E.Thompson
; W.J.Borucki
; | Date: |
30 Jun 2011 | Abstract: | Nineteen of the ~40 RR Lyr stars in the Kepler field have been identified as
candidate non-Blazhko (or unmodulated) stars. In this paper we present the
results of Fourier decomposition of the time-series photometry of these stars
acquired during the first 417 days of operation (Q0-Q5) of the Kepler
telescope. Fourier parameters based on ~18400 long-cadence observations per
star (and ~150000 short-cadence observations for FN Lyr and for AW Dra) are
derived. None of the stars shows the recently discovered ’period-doubling’
effect seen in Blazhko variables; however, KIC 7021124 has been found to
pulsate simultaneously in the fundamental and second overtone modes with a
period ratio P2/P0 ~ 0.59305 and is similar to the double-mode star V350 Lyr.
Period change rates are derived from O-C diagrams spanning, in some cases, over
100 years; these are compared with high-precision periods derived from the
Kepler data alone. Extant Fourier correlations by Kovacs, Jurcsik et al. (with
minor transformations from the V to the Kp passband) have been used to derive
underlying physical characteristics for all the stars. This procedure seems to
be validated through comparisons of the Kepler variables with galactic and LMC
RR Lyr stars. The most metal-poor star in the sample is NR Lyr, with
[Fe/H]=-2.3 dex; and the four most metal-rich stars have [Fe/H] ranging from
-0.6 to +0.1 dex. Pulsational luminosities and masses are found to be
systematically smaller than L and mass values derived from stellar evolution
models, and are favoured over the evolutionary values when periods are computed
with the Warsaw linear hydrodynamics code. Finally, the Fourier parameters are
compared with theoretical values derived using the Warsaw non-linear convective
pulsation code. | Source: | arXiv, 1106.6120 | Services: | Forum | Review | PDF | Favorites |
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