The Horizontal Branch of NGC 1851: Constraints on the Cluster Subpopulations

Abstract

We investigate the distribution of stars along the Horizontal Branch of the Galactic globular cluster NGC1851, to shed light on the progeny of the two distinct Subgiant Branch populations harbored by this cluster. On the basis of detailed synthetic Horizontal Branch modelling, we conclude that the two subpopulations are distributed in different regions of the observed Horizontal Branch: the evolved stars belonging to the bright Subgiant branch component are confined in the red portion of the observed sequence, whereas the ones belonging to the faint Subgiant branch component are distributed from the blue to the red, populating also the RR Lyrae instability strip. Our simulations strongly suggest that it is not possible to reproduce the observations assuming that the two subpopulations lose the same amount of mass along the Red Giant Branch. We warmly encourage empirical estimates of mass loss rates in Red Giant stars belonging to this cluster.

arXiv comment12 pages, including 2 figures. Accepted for publication in ApJL

References in corpus (10)

• A large stellar evolution database for population synthesis studies. I. Scaled solar models and isochrones
• A large stellar evolution database for population synthesis studies. II. Stellar models and isochrones for an alpha-enhanced metal distribution
• The ACS Survey of Galactic Globular Clusters. III. The Double Subgiant Branch of NGC 1851
• The double Subgiant Branch of NGC 1851: the role of the CNO abundance
• An abundance analysis of bright giants in the globular cluster NGC 1851
• RR Lyrae stars in Galactic globular clusters.III. Pulsational predictions for metal content Z=0.0001 to Z=0.006
• Bimodality and Gaps on Globular Cluster Horizontal Branches. II. The Cases of NGC 6229, NGC 1851 and NGC 2808
• The First Empirical Mass Loss Law for Population II Giants
• CCD Photometry of Galactic Globular Clusters. IV. The NGC 1851 RR Lyraes
• Is mass loss along the red giant branch of globular clusters sharply peaked? The case of M3

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• The mosaic multiple stellar populations in $\omega$ Centauri : the Horizontal Branch and the Main Sequence
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• An HST/WFC3 view of stellar populations on the Horizontal Branch of NGC 2419
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• The puzzle of metallicity and multiple stellar populations in the Globular Clusters in Fornax
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters -- XI. The horizontal branch in NGC\,6388 and NGC\,6441
• The Horizontal Branch population of NGC 1851 as revealed by the Ultra-violet Imaging Telescope (UVIT)
• G2C2 - IV: A novel approach to study the radial distributions of multiple populations in Galactic globular clusters
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• The Ages of Stars: The Horizontal Branch
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