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

In a shallow near-infrared survey of the dwarf Irregular galaxy, NGC 3109,near the periphery of the Local Group, we have found eight Mira variables,seven of which appear to be oxygen-rich (O-Miras). The periods range from about430 days to almost 1500 days. Because of our relatively bright limitingmagnitude, only 45 of the more than 400 known carbon stars were measured, butnone was found to be a large amplitude variable. One of the Miras may be anunrecognised C star. Five of the O-Miras are probably hot-bottom burning starsconsidering that they are brighter than expected from the period--luminosityrelation of Miras and that, by comparison with theoretical evolutionary tracks,they appear to have masses >~4 Msun. A census of very long period (P>1000 days)Miras in the Galaxy and Magellanic Clouds is presented and discussed togetherwith the newly discovered long period, but relatively blue, variables in NGC3109. New $JHKL$ photometry is presented for three O-rich long period Miras i nthe SMC (including a candidate super-AGB star).

Luminous AGB variables in the dwarf Irregular Galaxy, NGC 3109