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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We present the first evidence of clear signatures of tidal distortions in thedensity distribution of the fascinating open cluster NGC~6791. We find that the2D density map shows a clear elongation and an irregular distribution startingfrom $\sim 300^{\prime\prime}$ from the cluster center and two tails extendingin opposite directions beyond the tidal radius. These features are aligned toboth the absolute proper motion and to the Galactic centre directions.Accordingly we find that both the surface brightness and star count densityprofiles reveal a departure from a King model starting from$\sim600^{\prime\prime}$. These observational evidences suggest that NGC~6791is currently undergoing mass-loss likely due to gravitational shocking andinteractions with the tidal field of the Milky Way. We derive the expectedmass-loss due to stellar evolution and tidal interactions and we estimate theinitial cluster mass to be $M_{ini} = (1.5-4.0 ) \times 10^5 M_{\odot}$.

Evidences of tidal distortion and mass loss from the old open cluster NGC 6791