SIMBAD references

2023ApJ...959..141W - Astrophys. J., 959, 141 (2023/December-3)

Chemical Analysis of the Brightest Star of the Cetus II Ultrafaint Dwarf Galaxy Candidate.

WEBBER K.B., HANSEN T.T., MARSHALL J.L., SIMON J.D., PACE A.B., MUTLU-PAKDIL B., DRLICA-WAGNER A., MARTINEZ-VAZQUEZ C.E., AGUENA M., ALLAM S.S., ALVES O., BERTIN E., BROOKS D., CARNERO ROSELL A., CARRETERO J., DA COSTA L.N., DE VICENTE J., DOEL P., FERRERO I., FRIEDEL D., FRIEMAN J., GARCIA-BELLIDO J., GIANNINI G., GRUEN D., GRUENDL R.A., HINTON S.R., HOLLOWOOD D.L., HONSCHEID K., KUEHN K., MENA-FERNANDEZ J., MENANTEAU F., MIQUEL R., OGANDO R.L.C., PEREIRA M.E.S., PIERES A., PLAZAS MALAGON A.A., SANCHEZ E., SANTIAGO B., SMITH J.A., SMITH M., SUCHYTA E., TARLE G., TO C., WEAVERDYCK N. and YANNY B.

Abstract (from CDS):

We present a detailed chemical abundance analysis of the brightest star in the ultrafaint dwarf (UFD) galaxy candidate Cetus II from high-resolution Magellan/MIKE spectra. For this star, DES J011740.53-173053, abundances or upper limits of 18 elements from carbon to europium are derived. Its chemical abundances generally follow those of other UFD galaxy stars, with a slight enhancement of the α-elements (Mg, Si, and Ca) and low neutron-capture element (Sr, Ba, and Eu) abundances supporting the classification of Cetus II as a likely UFD. The star exhibits lower Sc, Ti, and V abundances than Milky Way (MW) halo stars with similar metallicity. This signature is consistent with yields from a supernova originating from a star with a mass of ∼11.2 M⊙. In addition, the star has a potassium abundance of [K/Fe] = 0.81, which is somewhat higher than the K abundances of MW halo stars with similar metallicity, a signature that is also present in a number of UFD galaxies. A comparison including globular clusters and stellar stream stars suggests that high K is a specific characteristic of some UFD galaxy stars and can thus be used to help classify objects as UFD galaxies.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Chemical abundances - Stellar abundances

Status at CDS : Associated data (images, light curves, etc...) being ingested in VizieR.

Simbad objects: 39

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