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Title:
The Horizontal Branch of NGC 1851: Constraints on the Cluster Subpopulations
Authors:
Salaris, M.; Cassisi, S.; Pietrinferni, A.
Affiliation:
AA(Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD, UK ), AB(INAF-Osservatorio Astronomico di Collurania, Via M. Maggini, I-64100 Teramo, Italy ), AC(INAF-Osservatorio Astronomico di Collurania, Via M. Maggini, I-64100 Teramo, Italy )
Publication:
The Astrophysical Journal, Volume 678, Issue 1, pp. L25-L28. (ApJL Homepage)
Publication Date:
05/2008
Origin:
UCP
Astronomy Keywords:
Galaxy: Globular Clusters: Individual: NGC Number: NGC 1851, Stars: Hertzsprung-Russell Diagram, Stars: Horizontal-Branch, Stars: Mass Loss
DOI:
10.1086/588467
Bibliographic Code:
2008ApJ...678L..25S

Abstract

We investigate the distribution of stars along the horizontal branch of the Galactic globular cluster NGC 1851, 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 modeling, 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 to 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.
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