English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present a homogeneous survey of the CN and CH bandstrengths in eightGalactic globular clusters observed during the course of the Sloan Extensionfor Galactic Understanding and Exploration (SEGUE) sub-survey of the SDSS. Weconfirm the existence of a bimodal CN distribution among RGB stars in all ofthe clusters with metallicity greater than [Fe/H] = -1.7; the lowestmetallicity cluster with an observed CN bimodality is M53, with [Fe/H] ~ -2.1.There is also some evidence for individual CN groups on the subgiant branchesof M92, M2, and M13, and on the red giant branches of M92 and NGC 5053.Finally, we quantify the correlation between overall cluster metallicity andthe slope of the CN bandstrength-luminosity plot as a means of furtherdemonstrating the level of CN-enrichment in cluster giants. Our results agreewell with previous studies reported in the literature.

A Survey of CN and CH Variations in Galactic Globular Clusters from SDSS Spectroscopy