CoRoT 102749568: mode identification in a<i>δ</i>Scuti star based on regular spacings

Paparó, M.; Bognár, Zs.; Benkő, J. M.; Moya, A.; Suárez, J. C.; Sódor, Á.; Hareter, M.; Poretti, E.; Guenther, E. W.; Auvergne, M.; Baglin, A.; Weiß, W. W.

doi:10.1051/0004-6361/201321792

Cited by 16 publications

(18 citation statements)

References 64 publications

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“…The ratios of the rotational splitting values (Chen et al 2017), presented in Table 11. and the independent shifts (table 6 of Paparó et al 2013) of the l = 0, 1 and 2 sequences were calculated.…”

Section: Sequence Searchmentioning

confidence: 99%

The Delta Scuti star 38 Eri from the ground and from space

Paparó

Kollath

Shobbrook

et al. 2018

Monthly Notices of the Royal Astronomical Society

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We present and discuss the pulsational characteristics of the Delta Scuti star 38 Eri from photometric data obtained at two widely spaced epochs, partly from the ground (1998) and partly from space (MOST, 2011). We found 18 frequencies resolving the discrepancy among the previously published frequencies. Some of the frequencies appeared with different relative amplitudes at two epochs, however, we carried out investigation for amplitude variability for only the MOST data. Amplitude variability was found for one of three frequencies that satisfy the necessary frequency criteria for linear-combination or resonant-mode coupling. Checking the criteria of beating and resonant-mode coupling we excluded them as possible reason for amplitude variability. The two recently developed methods of rotational-splitting and sequence-search were applied to find regular spacings based only on frequencies. Doublets or incomplete multiplets with l = 1, 2 and 3 were found in the rotational splitting search. In the sequence search method we identified four sequences. The averaged spacing, probably a combination of the large separation and the rotational frequency, is 1.724 ± 0.092 d −1 . Using the spacing and the scaling relationρ = [0.0394, 0.0554] gcm −3 was derived. The shift of the sequences proved to be the integer multiple of the rotational splitting spacing. Using the precise MOST frequencies and multi-colour photometry in a hybrid way, we identified four modes with l = 1, two modes with l = 2, two modes with l = 3, and two modes as l = 0 radial modes.

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Section: Sequence Searchmentioning

confidence: 99%

The Delta Scuti star 38 Eri from the ground and from space

Paparó

Kollath

Shobbrook

et al. 2018

Monthly Notices of the Royal Astronomical Society

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“…García Hernández et al Paparó et al 2013). The large separation can be calculated in a first approximation as…”

Section: Frequency and Period Spacingsmentioning

confidence: 99%

KIC 9533489: a genuineγDoradus – δScutiKeplerhybrid pulsator with transit events

Bognár

Lampens

Frémat

et al. 2015

A&A

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Context. Several hundred candidate hybrid pulsators of type A-F have been identified from space-based observations. Their large number allows both statistical analyses and detailed investigations of individual stars. This offers the opportunity to study the full interior of the genuine hybrids, in which both low radial order p-and high-order g-modes are self-excited at the same time. However, a few other physical processes can also be responsible for the observed hybrid nature, related to binarity or to surface inhomogeneities. The finding that most δ Scuti stars also show long-period light variations represents a real challenge for theory. Aims. We aim at determining the pulsation frequencies of KIC 9533489, to search for regular patterns and spacings among them, and to investigate the stability of the frequencies and the amplitudes. An additional goal is to study the serendipitously detected transit events: is KIC 9533489 the host star? What are the limitations on the physical parameters of the involved bodies? Methods. We performed a Fourier analysis of all the available Kepler light curves. We investigated the frequency and period spacings and determined the stellar physical parameters from spectroscopic observations. We also modelled the transit events. • . The transit analysis disclosed that the transit events that occur with a ≈197 d period may be caused by a 1.6 R Jup body orbiting a fainter star, which would be spatially coincident with KIC 9533489.

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“…A personal motivation was our result for the δ Scuti star CoRoT 102749568 (Paparó et al 2013). The frequency difference of the dominant modes and the period ratio, which is consistent with the radial fundamental and first overtone, yielded a relative identification of 12 frequencies with 3 different degrees, l. They did not show a comb-like structure, as in the asymptotic regime, but were regularly interwoven.…”

Section: Search For Sequencesmentioning

confidence: 99%

Unexpected Series of Regular Frequency Spacing of Δ Scuti Stars in the Non-Asymptotic Regime. I. The Methodology

Paparó

Benkő

Hareter

et al. 2016

ApJ

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A sequence search method was developed to search the regular frequency spacing in δ Scuti stars through visual inspection and an algorithmic search. We searched for sequences of quasi-equally spaced frequencies, containing at least four members per sequence, in 90 δ Scuti stars observed by CoRoT. We found an unexpectedly large number of independent series of regular frequency spacing in 77 δ Scuti stars (from one to eight sequences) in the nonasymptotic regime. We introduce the sequence search method presenting the sequences and echelle diagram of CoRoT 102675756 and the structure of the algorithmic search. Four sequences (echelle ridges) were found in the 5-21 d −1 region where the pairs of the sequences are shifted (between 0.5 and 0.59 d −1 ) by twice the value of the estimated rotational splitting frequency (0.269 d −1 ). The general conclusions for the whole sample are also presented in this paper. The statistics of the spacings derived by the sequence search method, by FT (Fourier transform of the frequencies), and the statistics of the shifts are also compared. In many stars more than one almost equally valid spacing appeared. The model frequencies of FG Vir and their rotationally split components were used to formulate the possible explanation that one spacing is the large separation while the other is the sum of the large separation and the rotational frequency. In CoRoT 102675756, the two spacings (2.249 and 1.977 d −1 ) are in better agreement with the sum of a possible 1.710 d −1 large separation and two or one times, respectively, the value of the rotational frequency.

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CoRoT 102749568: mode identification in aδScuti star based on regular spacings

Cited by 16 publications

References 64 publications

The Delta Scuti star 38 Eri from the ground and from space

The Delta Scuti star 38 Eri from the ground and from space

KIC 9533489: a genuineγDoradus – δScutiKeplerhybrid pulsator with transit events

Unexpected Series of Regular Frequency Spacing of Δ Scuti Stars in the Non-Asymptotic Regime. I. The Methodology

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