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

Paparó, M.; Benkő, J. M.; Hareter, M.; Guzik, Joyce A.

doi:10.3847/0004-637x/822/2/100

Cited by 27 publications

(20 citation statements)

References 48 publications

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“…The scaling relation could lead to the possibility of a massive statistical investigation of δ Scuti stars. Not only the determination of the spacing, but the identification of independent modes were aimed at searching for sequences of quasi-regularly distributed modes, allowing for a tolerance level in the exact spacing (Paparó et al, 2016b). Echelle diagrams were constructed for 90 CoRoT δ Scuti stars and the characteristic spacings were derived (Paparó et al, 2016a).…”

Section: Results Between 1970-1980mentioning

confidence: 99%

An Observer's View on the Future of Asteroseismology

Paparó

2019

Front. Astron. Space Sci.

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Scientific research is a continuous process, and the speed of future progress can be estimated by the pace of finding explanations for previous research questions. In this observers based view of stellar pulsation and asteroseismology, we start with the earliest observations of variable stars and the techniques used to observe them. The earliest variable stars were large amplitude, radial pulsators but were followed by other classes of pulsating stars. As the field matured, we outline some cornerstones of research into pulsating star research with an emphasis on changes in observational techniques. Improvements from photographs, to photometry, CCDs, and space telescopes allowed researchers to separate out pulsating stars from other stars with light variations, recognize radial and nonradial pulsation courtesy of increased measurement precision, and then use nonradial pulsations to look inside the stars, which cannot be done any other way. We follow several highlighted problems to show that even with excellent space data, there still may not be quick theoretical explanations. As the result of technical changes, the structure of international organizations devoted to pulsating stars has changed, and an increasing number of conferences specialized to space missions or themes are held. Although there are still many unsolved problems, such as mode identification in non-asymptotic pulsating stars, the large amount of data with unprecedented precision provided by space missions (MOST, CoRoT, Kepler) and upcoming missions allow us to use asteroseismology to its full potential. However, the enormous flow of data will require new techniques to extract the science before the next missions. The future of asteroseismology will be successful if we learn from the past and improve with improved techniques, space missions, and a properly educated new generation.

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Section: Results Between 1970-1980mentioning

confidence: 99%

An Observer's View on the Future of Asteroseismology

Paparó

2019

Front. Astron. Space Sci.

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“…Reproduced with permission. Paparó et al (2016a). Sequences with quasi-equal spacing, and shifts of the sequences for CoRoT 102675756.…”

Section: Finding and Interpreting Frequency (Period) Spacing Patternsmentioning

confidence: 99%

Highlights of Discoveries for δ Scuti Variable Stars From the Kepler Era

Guzik

2021

Front. Astron. Space Sci.

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The NASA Kepler and follow-on K2 mission (2009–2018) left a legacy of data and discoveries, finding thousands of exoplanets, and also obtaining high-precision long time-series data for hundreds of thousands of stars, including many types of pulsating variables. Here we highlight a few of the ongoing discoveries from Kepler data on δ Scuti pulsating variables, which are core hydrogen-burning stars of about twice the mass of the Sun. We discuss many unsolved problems surrounding the properties of the variability in these stars, and the progress enabled by Kepler data in using pulsations to infer their interior structure, a field of research known as asteroseismology.

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“…Additional filters were considered in order to avoid spurious peaks. Only those stars for which a periodic pattern is found were kept (see details in Paparó et al 2016). The final CoRoT sample used in this work has 74 stars with fundamental parameters (T eff , logg and radial velocities), obtained using low-resolution spectroscopic measurements with the AAOmega instrument (Hareter 2012).…”

Section: Data Samplesmentioning

confidence: 99%

Semi-empirical seismic relations of A-F stars from COROT and Kepler legacy data

Moya¹,

Suárez²,

Hernández³

et al. 2017

Monthly Notices of the Royal Astronomical Society

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Asteroseismology is witnessing a revolution thanks to high-precise asteroseismic space data (MOST, CoRoT, Kepler, BRITE), and their large ground-based follow-up programs. Those instruments have provided an unprecedented large amount of information, which allows us to scrutinize its statistical properties in the quest for hidden relations among pulsational and/or physical observables. This approach might be particularly useful for stars whose pulsation content is difficult to interpret. This is the case of intermediate-mass classical pulsating stars (i.e. γ Dor, δ Scuti, hybrids) for which current theories do not properly predict the observed oscillation spectra. Here we establish a first step in finding such hidden relations from Data Mining techniques for these stars. We searched for those hidden relations in a sample of δ Scuti and hybrid stars observed by CoRoT and Kepler (74 and 153, respectively). No significant correlations between pairs of observables were found. However, two statistically significant correlations emerged from multivariable correlations in the observed seismic data, which describe the total number of observed frequencies and the largest one, respectively. Moreover, three different sets of stars were found to cluster according to their frequency density distribution. Such sets are in apparent agreement with the asteroseismic properties commonly accepted for A-F pulsating stars.

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

Cited by 27 publications

References 48 publications

An Observer's View on the Future of Asteroseismology

An Observer's View on the Future of Asteroseismology

Highlights of Discoveries for δ Scuti Variable Stars From the Kepler Era

Semi-empirical seismic relations of A-F stars from COROT and Kepler legacy data

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