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

Three presumably young eclipsing binary systems in the direction of theCygnus OB1, OB3 and OB9 associations are studied. Component spectra arereconstructed and their orbits are determined using light curves and spectradisentangling techniques. V443 Cyg and V456 Cyg have circular orbits, while thelight curve of V2107\,Cyg imposes a slightly eccentric orbit($e=0.045\pm0.03)$. V443 Cyg harbours F-type stars, and not young early-A starsas previously suggested in the literature based on photometry solely. Itappears to be situated in the foreground (distance $0.6\pm0.2$ kpc) of theyoung stellar populations in Cygnus. V456 Cyg, at a distance of $0.50\pm0.03$kpc consists of a slightly metal-weak A--type and an early--F star. The age ofboth systems, on or very near to the main sequence, remains uncertain by anorder of magnitude. V2107 Cyg is a more massive system ($8.9\pm2$ and$4.5\pm1.2 M_\odot$) at $1.5\pm0.5$ kpc and, also kinematically, a strongcandidate-member of Cyg OB1. The more massive component is slightly evolved andappears to undergo non-radial $\beta Cep$-type pulsations. The Doppler signalof the secondary is barely detectable. A more extensive study is important tofix masses more precisely, and an asteroseismological study would then becomeappropriate. Nevertheless, the position of the primary in the HR-diagramconfines the age already reasonably well to $20\pm5$ Myr, indicating for CygOB1 a similar extent of star formation history as established for Cyg OB2.

Study of Eclipsing Binary and Multiple Systems in OB Associations II. The Cygnus OB Region: V443 Cyg, V456 Cyg and V2107 Cyg