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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We analyze post-refurbishment Hubble Space Telescope images of four globularclusters in M31. The ability to resolve stars to below the horizontal branchpermits us to use star counts to extend the surface brightness profilesdetermined using aperture photometry to almost 5 orders of magnitude below thecentral surface density. Three of the resulting cluster profiles are reasonablywell-fit using single-mass King models, with core and tidal radii typical ofthose seen in Galactic globular clusters. We confirm an earlier report of thediscovery of a cluster which has apparently undergone core collapse. Three ofthe four clusters show departures in their outskirts from King model behaviorwhich, based on recent results for Galactic globulars, may indicate thepresence of tidal tails.Comment: 15 pages, 10 tables, 8 postscript figures, aaspp4.sty, flushrt.sty,  and aj_pt.sty included, accepted for publication in the Astronomical Journa

Hubble Space Telescope Observations of Globular Clusters in M31. II. Structural Parameters