2015A&A...583A..74J


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST08:01:11

2015A&A...583A..74J - Astronomy and Astrophysics, volume 583A, 74-74 (2015/11-1)

Analysis of the acoustic cut-off frequency and high-frequency peaks in six Kepler stars with stochastically excited pulsations.

JIMENEZ A., GARCIA R.A., PEREZ HERNANDEZ F. and MATHUR S.

Abstract (from CDS):

Gravito-acoustic modes in the Sun and other stars propagate in resonant cavities with a frequency below a given limit known as the cut-off frequency. At higher frequencies, waves are no longer trapped in the stellar interior and become traveller waves. In this article, we study six pulsating solar-like stars at different evolutionary stages observed by the NASA Kepler mission. These high signal-to-noise targets show a peak structure that extends at very high frequencies and are good candidates for studying the transition region between the modes and interference peaks or pseudo-modes. Following the same methodology successfully applied on Sun-as-a-star measurements, we uncover the existence of pseudo-modes in these stars with one or two dominant interference patterns depending on the evolutionary stage of the star. We also infer their cut-off frequency as the midpoint between the last eigenmode and the first peak of the interference patterns. Using ray theory we show that, while the period of one of the interference patterns is very close to half the large separation, the period of the other interference pattern depends on the time phase of mixed waves, thus carrying additional information on the stellar structure and evolution.

Abstract Copyright:

Journal keyword(s): asteroseismology - stars: evolution - stars: solar-type - stars: oscillations

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 2MASS J18441281+4332024 RG* 18 44 12.8098541028 +43 32 02.365801764   10.69 9.67     K1IV 27 0
2 BD+46 2555 Ro* 18 47 39.2488304951 +46 41 09.978990968   9.98 9.52     F6IV 41 0
3 HD 175226 * 18 52 16.4987183752 +43 42 35.795775824   7.91 7.42     F6IV 52 0
4 TYC 3120-180-1 * 19 00 42.9751738603 +38 34 24.882641980   10.33 9.84     G0IV 20 0
5 TYC 3551-149-1 PM* 19 27 20.4902312930 +48 57 12.008653325   10.59 9.85     G5IV 43 0
6 BD+49 3061 * 19 36 18.8485267350 +49 49 26.943139394   10.32 9.49     G8IV 26 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-08:01:11

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