Kavli Affiliate: Alexander P. Ji
| First 5 Authors: Mairéad E Heiger, Mairéad E Heiger, , ,
| Summary:
We present detailed chemical abundances of the brightest star in each of the
ultra-faint dwarf galaxies Eridanus IV and Centaurus I using high-resolution
Magellan/MIKE spectroscopy. The brightest star in Centaurus I, CenI-5136, is a
very metal-poor star with metallicity [Fe/H] = $-2.52pm0.17$ and chemical
abundances typical of a star in an ultra-faint dwarf galaxy. We confirm that
the star in Eridanus IV, EriIV-9808, is extremely metal-poor ([Fe/H] =
$-3.25pm0.19$) and find that it is carbon-enhanced, with [C/Fe] =
$1.07pm0.34$, as is common for many stars at this metallicity. Both stars are
also neutron-capture deficient, which is typical of stars in ultra-faint dwarf
galaxies, but less common in other environments. We consider possible
enrichment scenarios for EriIV-9808 and tentatively conclude that it is
unlikely to be the descendant of a single Pop III progenitor, despite its
carbon-enhancement and low metallicity.
| Search Query: ArXiv Query: search_query=au:”Alexander P. Ji”&id_list=&start=0&max_results=3