Catalogue and properties of δ Scuti stars in binaries

Liakos, A.; Niarchos, P. G.

doi:10.1093/mnras/stw2756

Cited by 100 publications

(126 citation statements)

References 263 publications

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“…Zero and Terminal Age (ZAMS and TAMS, respectively) main-sequence lines (for solar metallicity composition, i.e. Z=0.019) for these diagrams were taken from Girardi et al (2000), while the positions of the other δ Scuti stars of oEA systems from Liakos & Niarchos (2017). The secondaries of all systems have left main-sequence and they are in the subgiant evolutionary phase.…”

Section: Discussionmentioning

confidence: 99%

“…In particular, KIC 06220497 (Lee et al 2016) and the four presented herein are oEA stars, nine of these are detached systems, while another three are still unclassified regarding their Roche geometry (see Liakos & Niarchos 2017, and references therein).…”

Section: Introductionmentioning

confidence: 93%

“…Liakos quantities do not correlate. Finally, Liakos & Niarchos (2017) published the most complete catalogue 1 (204 δ Scuti stars in 199 binary systems) and correlations between fundamental parameters up to date.…”

Section: Introductionmentioning

confidence: 99%

“…According to the catalogue of Liakos & Niarchos (2017) only 17 cases of Kepler EBs with a δ Scuti component have been published so far. In particular, KIC 06220497 (Lee et al 2016) and the four presented herein are oEA stars, nine of these are detached systems, while another three are still unclassified regarding their Roche geometry (see Liakos & Niarchos 2017, and references therein).…”

Section: Introductionmentioning

confidence: 99%

“…Preliminary results regarding the dominant pulsation frequency and the Roche geometry of the systems have been published by Liakos & Niarchos (2016) for KIC 06669809 and by Liakos & Niarchos (2017) for the rest three EBs. In Table 1 are listed for all studied systems the respective observations logs.…”

Section: Introductionmentioning

confidence: 99%

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Asteroseismology ofKeplerAlgol-type oscillating eclipsing binaries

Liakos

2017

A&A

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Context. This research paper contains light curve modelling, spectroscopy and detailed asteroseismic studies for four out of five in total semidetached eclipsing binaries with a δ Scuti component, that have been detected to date through Kepler mission, namely KIC 06669809, KIC 10581918, KIC 10619109 and KIC 11175495. Aims. The goal is to study the pulsational characteristics of the oscillating stars of the systems as well as to estimate their absolute parameters and enrich the so far poor sample of this kind of systems. Methods. Ground based spectroscopic observations provide the means to estimate the spectral types of the primary components and to model the light curves with higher certainty. The photometric data are analysed using eclipsing binary modeling techniques, while Fourier analysis is applied on their residuals in order to reveal the pulsation frequency modes. Results. The results of analyses show that the primaries are pulsating stars of δ Scuti type and that all systems belong to the group of Algol type binaries with an oscillating star, namely oEA stars. The primaries of KIC 06669809, KIC 10581918, and KIC 10619109 pulsate in three, two, and five frequencies, respectively and in more than 200 other detected as combinations. The δ Scuti star of KIC 11175495 is the youngest and the fastest pulsator in binary systems that has ever been found and it oscillates in three main nonradial frequencies, while other 153 are also found as depended ones. Moreover, a comparison of their properties with other systems of the same type as well as with theoretical models of pulsating stars are also presented and discussed.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Asteroseismology ofKeplerAlgol-type oscillating eclipsing binaries

Liakos

2017

A&A

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STEREO observations of hybrid stars V775 Tau and V483 Tau

Özuyar

2018

Astrophys Space Sci

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In this study, pulsational and physical characteristics of two δ Scuti stars, V775 Tau and V483 Tau, are analysed by using four-year high-precision photometric data of the STEREO satellite. Thus, it is aimed to gain new insights into behaviours of these pulsators and evolution of δ Scuti, γ Dor and Am type stars. The data are taken between 2007-2011 and examined with the help of the Lomb-Scargle method. The detection precision in the four-year combined data is around 10 −5 cd −1 in frequency and 10 −5 mag in amplitude. It is revealed that V775 Tau exhibits weak pulsation characteristic which is interpreted as the existence of the interaction between the helium loss in the partial ionization zone and pulsation intensities. It is also considered that the absence of strong pulsations is also related to the evolution status of the star. Further, its periodogram shows low-frequency peaks. If these oscillations are g-modes, V775 Tau can be thought to be one of the rare stars that show all γ Dor, δ Scuti and Am type variations. V483 Tau is comparatively more luminous, hotter and has higher rotational velocity. Therefore, although it shares the same region with V775 Tau in the H-R diagram, it is not considered to be an Am star. Yet, it exactly overlaps with the γ Dor stars. These clues as well as g-modes detected in its periodogram indicate that V483 Tau is a hybrid star. Finally, both V775 Tau and V483 Tau display period changes whose rates are between 10 −3 and 10 −4 yr −1 . Considering the δ Scuti nature, it may be speculated that these changes are non-evolutionary.

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