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

Many of the scenarios proposed to explain the origin of chemically peculiarstars in globular clusters (GCs) require significant mass-loss ($\ge95\%$) toexplain the observed fraction of such stars. In the GCs of the Fornax dwarfgalaxy significant mass-loss could be a problem. Larsen et al. (2012) showedthat there is a large ratio of GCs to metal-poor field stars in Fornax andabout $20-25\%$ of all the stars with ${\rm [Fe/H]}<-2$ belong to the fourmetal-poor GCs. This imposes an upper limit of $\sim80\%$ mass-loss that couldhave happened in Fornax GCs. In this paper, we propose a solution to thisproblem by suggesting that stars can leave the Fornax galaxy. We use a seriesof $N$-body simulations, to determine the limit of mass-loss from Fornax as afunction of the initial orbital radii of GCs and the speed with which starsleave Fornax GCs. We consider a set of cored and cuspy density profiles forFornax. Our results show that with a cuspy model for Fornax, the fraction ofstars which leave the galaxy, can be as high as $\sim90\%$, when the initialorbital radii of GCs are $R=2-3\,\rm{kpc}$ and the initial speed of stars is$v>20\,\rm{km\,s^{-1}}$. We show that such large velocities can be achieved bygas expulsion induced mass-loss but not stellar evolution induced mass-loss.Our results imply that one cannot interpret the metallicity distribution ofFornax field stars as evidence against significant mass-loss in Fornax GCs, ifmass-loss is due to gas expulsion.

Limits on the significant mass-loss scenario based on the globular clusters of the Fornax dwarf spheroidal galaxy