A turn-off detached binary star V568 Lyr in the<i>Kepler</i>field of the oldest open cluster (NGC 6791) in the Galaxy

Yakut, K.; Eggleton, P. P.; Kalomeni, B.; Tout, Christopher A.; Eldridge, J. J.

doi:10.1093/mnras/stv1773

Cited by 9 publications

(13 citation statements)

References 44 publications

(60 reference statements)

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“…Both systems are members of the metal-rich open cluster NGC 6791 and consist of a solar-like primary that approaches the end of the MS and a solar-like companion still on the MS. Fundamental parameters for both systems are given in Brogaard et al (2011), but for V568 Lyr we used the updated values by Yakut et al (2015). Observations by Brogaard et al (2011) show a mean difference of ±0.05 dex in [Fe/H] between the primaries, which is also the upper limit for the observed colour spread in the cluster, which results from the Table 1).…”

Section: Resultsmentioning

confidence: 99%

Testing stellar evolution models with detached eclipsing binaries

Higl

Weiß

2017

A&A

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Stellar evolution codes, as all other numerical tools, need to be verified. One of the standard stellar objects that allow stringent tests of stellar evolution theory and models, are detached eclipsing binaries. We have used 19 such objects to test our stellar evolution code, in order to see whether standard methods and assumptions suffice to reproduce the observed global properties. In this paper we concentrate on three effects that contain a specific uncertainty: atomic diffusion as used for standard solar model calculations, overshooting from convective regions, and a simple model for the effect of stellar spots on stellar radius, which is one of the possible solutions for the radius problem of M dwarfs. We find that in general old systems need diffusion to allow for, or at least improve, an acceptable fit, and that systems with convective cores indeed need overshooting. Only one system (AI Phe) requires the absence of it for a successful fit. To match stellar radii for very low-mass stars, the spot model proved to be an effective approach, but depending on model details, requires a high percentage of the surface being covered by spots. We briefly discuss improvements needed to further reduce the freedom in modelling and to allow an even more restrictive test by using these objects.

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Section: Resultsmentioning

confidence: 99%

Testing stellar evolution models with detached eclipsing binaries

Higl

Weiß

2017

A&A

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“…The NGC 6791 turnoff binary system V568 Lyr is one of those objects where the observational measurements obtained from a combination of Kepler space-based photometry and ground-based high-resolution spectroscopy significantly disagree with the predictions of the tidal evolution theory. In particular, [38] found the system to be about 7.5 Gyr old and to have a circular orbit. Contrary to these findings, the tidal evolution theory predicts a significant eccentricity for the system and the tidal friction would need to be increased by a factor of ∼100 in the models to make them consistent with the observations.…”

Section: Binary Stars and Tidal Evolution Theorymentioning

confidence: 99%

Dynamical Asteroseismology: towards improving the theories of stellar structure and (tidal) evolution

Tkachenko

2017

EPJ Web Conf.

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Abstract. The potential of the dynamical asteroseismology, the research area that builds upon the synergies between the asteroseismology and binary stars research fields, is discussed in this manuscript. We touch upon the following topics: i) the mass discrepancy observed in intermediate-to high-mass main-sequence and evolved binaries as well as in the low mass systems that are still in the pre-main sequence phase of their evolution; ii) the rotationally induced mixing in high-mass stars, in particular how the most recent theoretical predictions and spectroscopic findings compare to the results of asteroseismic investigations; iii) internal gravity waves and their potential role in the evolution of binary star systems and surface nitrogen enrichment in high-mass stars; iv) the tidal evolution theory, in particular how its predictions of spin-orbit synchronisation and orbital circularisation compare to the present-day high-quality observations; v) the tidally-induced pulsations and their role in the angular momentum transport within binary star systems; vi) the scaling relations between fundamental and seismic properties of stars across the entire HR-diagram.

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“…Another area where EBs can be used to test stellar theory in detail is to study those that are members of stellar clusters, because theoretical models must then match the properties of the EB as well as the other cluster members for a single age and chemical composition [10,[183][184][185]. Kepler did not make a major contribution here because only four stellar clusters were observed within the Kepler field, although the data did allow detailed investigations of the open clusters NGC 6819 [186], NGC 6811 [187] and NGC 6791 [188]. The K2 mission has observed many more clusters and further results are expected.…”

Section: "Normal" Ebsmentioning

confidence: 99%

Space-Based Photometry of Binary Stars: From Voyager to TESS

Southworth

2021

Universe

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Binary stars are crucial laboratories for stellar physics, so have been photometric targets for space missions beginning with the very first orbiting telescope (OAO-2) launched in 1968. This review traces the binary stars observed and the scientific results obtained from the early days of ultraviolet missions (OAO-2, Voyager, ANS, IUE), through a period of diversification (Hipparcos, WIRE, MOST, BRITE), to the current era of large planetary transit surveys (CoRoT, Kepler, TESS). In this time observations have been obtained of detached, semi-detached and contact binaries containing dwarfs, sub-giants, giants, supergiants, white dwarfs, planets, neutron stars and accretion discs. Recent missions have found a huge variety of objects such as pulsating stars in eclipsing binaries, multi-eclipsers, heartbeat stars and binaries hosting transiting planets. Particular attention is paid to eclipsing binaries, because they are staggeringly useful, and to the NASA Transiting Exoplanet Survey Satellite (TESS) because its huge sky coverage enables a wide range of scientific investigations with unprecedented ease. These results are placed into context, future missions are discussed, and a list of important science goals is presented.

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A turn-off detached binary star V568 Lyr in theKeplerfield of the oldest open cluster (NGC 6791) in the Galaxy

Cited by 9 publications

References 44 publications

Testing stellar evolution models with detached eclipsing binaries

Testing stellar evolution models with detached eclipsing binaries

Dynamical Asteroseismology: towards improving the theories of stellar structure and (tidal) evolution

Space-Based Photometry of Binary Stars: From Voyager to TESS

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