English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present the Kepler photometric light-variation analysis of the late-typedouble-lined binary system V568 Lyr that is in the field of the highmetallicity old open cluster NGC 6791. The radial velocity and the high-qualityshort-cadence light curve of the system are analysed simultaneously. Themasses, radii and luminosities of the component stars are $M_1 =1.0886\pm0.0031\, M{\odot}$, $M_2 = 0.8292 \pm 0.0026\, M{\odot}$, $R_1 =1.4203\pm 0.0058\, R{\odot}$, $R_2 = 0.7997 \pm 0.0015\, R{\odot}$, $L_1 =1.85\pm 0.15\, L{\odot}$, $L_2 = 0.292 \pm 0.018\, L{\odot}$ and theirseparation is $a = 31.060 \pm 0.002\, R{\odot}$. The distance to NGC 6791 isdetermined to be $4.260\pm 0.290\,$kpc by analysis of this binary system. Wefit the components of this well-detached binary system with evolution modelsmade with the Cambridge STARS and TWIN codes to test low-mass binary starevolution. We find a good fit with a metallicity of $Z = 0.04$ and an age of$7.704\,$Gyr. The standard tidal dissipation, included in TWIN is insufficientto arrive at the observed circular orbit unless it formed rather circular tobegin with.

A Turnoff Detached Binary Star V568 Lyr in the Kepler Field of the Oldest Open Cluster (NGC 6791) in the Galaxy