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

Precise measurement of the fundamental parameters of stellar systems,including mass and radius, depends critically on how well the stellar distancesare known. Astrometry from space provides parallax measurements of unprecentedaccuracy, from which distances can be derived, initially from the Hipparcosmission, with further refinement of that analysis provided by van Leeuwen in2007. The publication of the Gaia DR2 catalogue promises a dramatic improvementin the available data. We have recalculated the dynamical masses of a sample of1 700 close visual binary stars using Gaia DR2 and compared the results withmasses derived from both the original and enhanced Hipparcos data. We show thevan Leeuwen analysis yields results close to those of Gaia DR2, but the latterare significantly more accurate. We consider the impact of the Gaia DR2parallaxes on our understanding of the sample of visual binaries.

Comparison of Gaia and Hipparcos parallaxes of close visual binary stars and the impact on determinations of their masses