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

Employing tidally enhanced stellar wind, we studied in binaries the effectsof metallicity, mass ratio of primary to secondary, tidal enhancementefficiency and helium abundance on the formation of blue hook (BHk) stars inglobular clusters (GCs). A total of 28 sets of binary models combined withdifferent input parameters are studied. For each set of binary model, wepresented a range of initial orbital periods that is needed to produce BHkstars in binaries. All the binary models could produce BHk stars withindifferent range of initial orbital periods. We also compared our results withthe observation in the Teff-logg diagram of GC NGC 2808 and {\omega} Cen. Mostof the BHk stars in these two GCs locate well in the region predicted by ourtheoretical models, especially when C/N-enhanced model atmospheres areconsidered. We found that mass ratio of primary to secondary and tidalenhancement efficiency have little effects on the formation of BHk stars inbinaries, while metallicity and helium abundance would play important roles,especially for helium abundance. Specifically, with helium abundance increasingin binary models, the space range of initial orbital periods needed to produceBHk stars becomes obviously wider, regardless of other input parametersadopted. Our results were discussed with recent observations and othertheoretical models.

monthly notices of the royal astronomical society

A possible formation channel for blue hook stars in globular cluster -  II. Effects of metallicity, mass ratio, tidal enhancement efficiency and  helium abundance