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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We examine the metallicity distribution function (MDF) and fraction ofcarbon-enhanced metal-poor (CEMP) stars in a sample that includes 86 stars with[Fe/H] < -3.0, based on high-resolution, high-S/N spectroscopy, of which some32 objects lie below [Fe/H] = -3.5. After accounting for the completenessfunction, the "corrected" MDF does not exhibit the sudden drop at [Fe/H] = -3.6that was found in recent samples of dwarfs and giants from the Hamburg/ESOsurvey. Rather, the MDF decreases smoothly down to [Fe/H] = -4.1. Similarresults are obtained from the "raw" MDF. We find the fraction of CEMP objectsbelow [Fe/H] = -3.0 is 23 +/- 6% and 32 +/- 8% when adopting the Beers et al.and Aoki et al. CEMP definitions, respectively. The former value is in fairagreement with some previous measurements, which adopt the Beers et al.criterion.

The Most Metal-Poor Stars. III. The Metallicity Distribution Function and CEMP Fraction