DETAILED ABUNDANCES OF RED GIANTS IN THE GLOBULAR CLUSTER NGC 1851: C+N+O AND THE ORIGIN OF MULTIPLE POPULATIONS

Journal Article · Sun Oct 10 04:00:00 EDT 2010 · Astrophysical Journal Letters

DOI:https://doi.org/10.1088/2041-8205/722/1/L18· OSTI ID:21452768

Villanova, S; Geisler, D ^[1]; Piotto, G ^[2]

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1. Departamento de Astronomia, Casilla 160, Universidad de Concepcion (Chile)
2. Dipartimento di Astronomia, Universita di Padova, Vicolo dell'Osservatorio 3, I-35122 Padua (Italy)

We present chemical abundance analysis of a sample of 15 red giant branch (RGB) stars of the globular cluster NGC 1851 distributed along the two RGBs of the (v, v-y) color-magnitude diagram. We determined abundances for C+N+O, Na, {alpha}, iron-peak, and s-elements. We found that the two RGB populations significantly differ in their light (N, O, Na) and s-element content. On the other hand, they do not show any significant difference in their {alpha} and iron-peak element content. More importantly, the two RGB populations do not show any significant difference in their total C+N+O content. Our results do not support previous hypotheses suggesting that the origins of the two RGBs and the two subgiant branches of the cluster are related to different content of either {alpha} (including Ca) or iron-peak elements, or C+N+O abundance, due to a second generation polluted by Type II supernovae.

• OSTI ID: 21452768
• Journal Information: Astrophysical Journal Letters, Journal Name: Astrophysical Journal Letters Journal Issue: 1 Vol. 722; ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ABUNDANCE
BINARY STARS
COLOR
ELECTROMAGNETIC RADIATION
ERUPTIVE VARIABLE STARS
OPTICAL PROPERTIES
ORGANOLEPTIC PROPERTIES
ORIGIN
PHYSICAL PROPERTIES
RADIATIONS
STARS
SUPERNOVAE
VARIABLE STARS
VISIBLE RADIATION