2015A&A...574A..17V


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.02CEST15:15:38

2015A&A...574A..17V - Astronomy and Astrophysics, volume 574A, 17-17 (2015/2-1)

Detecting non-uniform period spacings in the Kepler photometry of γ Doradus stars: methodology and case studies.

VAN REETH T., TKACHENKO A., AERTS C., PAPICS P.I., DEGROOTE P., DEBOSSCHER J., ZWINTZ K., BLOEMEN S., DE SMEDT K., HRUDKOVA M., RASKIN G. and VAN WINCKEL H.

Abstract (from CDS):

The analysis of stellar oscillations is one of the most reliable ways to probe stellar interiors. Recent space missions such as Kepler have provided us with an opportunity to study these oscillations with unprecedented detail. For many multi-periodic pulsators such as γ Doradus stars, this led to the detection of dozens to hundreds of oscillation frequencies that could not be found from ground-based observations. We aim to detect non-uniform period spacings in the Fourier spectra of a sample of γ Doradus stars observed by Kepler. Such detection is complicated by both the large number of significant frequencies in the space photometry and by overlapping non-equidistant rotationally split multiplets. Guided by theoretical properties of gravity-mode oscillation of γ Doradus stars, we developed a period-spacing detection method and applied it to Kepler observations of a few stars, after having tested the performance from simulations. The application of the technique resulted in the clear detection of non-uniform period spacing series for three out of the five treated Kepler targets. Disadvantages of the technique are also discussed, and include the disability to distinguish between different values of the spherical degree and azimuthal order of the oscillation modes without additional theoretical modelling. Despite the shortcomings, the method is shown to allow solid detections of period spacings for γ Doradus stars, which will allow future asteroseismic analyses of these stars.

Abstract Copyright:

Journal keyword(s): asteroseismology - methods: data analysis - stars: fundamental parameters - stars: variables: general

VizieR on-line data: <Available at CDS (J/A+A/574/A17): table1.dat>

Simbad objects: 5

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Number of rows : 5

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 KIC 6185513 gD* 18 57 29.0466 +41 30 58.091   12.30 11.89     F1V 6 0
2 KIC 6678174 gD* 19 10 05.7191 +42 09 54.588   12.03 11.72     ~ 8 0
3 KIC 5350598 gD* 19 11 54.3619 +40 34 01.719   12.23 12.45     ~ 4 0
4 KIC 11145123 dS* 19 41 25.3412172674 +48 45 14.989333768           A 27 0
5 KIC 11721304 gD* 19 43 27.8459011984 +49 51 25.395581711           F2V 11 0

    Equat.    Gal    SGal    Ecl

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2020.07.02-15:15:38

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