Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Horizontal Branch of NGC 1851: Constraints on the Cluster
  Subpopulations   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.

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The categories of this paper are: alg-geom
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The categories of this paper are: atom-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-lat
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The categories of this paper are: cs
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The categories of this paper are: acc-phys
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The categories of this paper are: nlin
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The categories of this paper are: comp-gas
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The categories of this paper are: dg-ga
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The categories of this paper are: q-fin
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The categories of this paper are: quant-ph
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The categories of this paper are: eess
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The categories of this paper are: hep-th
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The categories of this paper are: funct-an
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The categories of this paper are: physics
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The categories of this paper are: adap-org