Sodium-nitrogen correlation within globular clusters

Journal Article · Sat Nov 30 23:00:00 EST 1985 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/163700· OSTI ID:6061206

Norris, J; Pilachowski, C A

A spectroscopic survey of nine nitrogen-rich/nitrogen-poor pairs of giants in five globular clusters has been made to ascertain if there is a positive correlation between the behavior of the Na I D lines and the abundance of nitrogen as is known to exist in 47 Tuc and NGC 6752. In eight of the nine pairs (in the clusters M3, M4, M5, M13, and M92) a positive correlation is found. A differential LTE model atmosphere analysis shows that on average the nitrogen-rich objects are enhanced in sodium by approx.0.5 dex relative to their nitrogen-poor counterparts.

• Research Organization: Mount Stromlo and Siding Spring Observatories, Research School of Physical Sciences, Australian National University
• OSTI ID: 6061206
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 299:1; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
ALKALI METALS
ATMOSPHERES
ELEMENTS
GIANT STARS
MATHEMATICAL MODELS
METALS
NITROGEN
NONMETALS
NUCLEOSYNTHESIS
SODIUM
SPECTROSCOPY
STAR CLUSTERS
STAR MODELS
STARS
STELLAR ATMOSPHERES
SYNTHESIS
VARIATIONS