Bibcode
Webber, K. B.; Hansen, T. T.; Marshall, J. L.; Simon, J. D.; Pace, A. B.; Mutlu-Pakdil, B.; Drlica-Wagner, A.; Martínez-Vázquez, 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.; García-Bellido, J.; Giannini, G.; Gruen, D.; Gruendl, R. A.; Hinton, S. R.; Hollowood, D. L.; Honscheid, K.; Kuehn, K.; Mena-Fernández, J.; Menanteau, F.; Miquel, R.; Ogando, R. L. C.; Pereira, M. E. S.; Pieres, A.; Plazas Malagón, A. A.; Sanchez, E.; Santiago, B.; Smith, J. Allyn; Smith, M.; Suchyta, E.; Tarle, G.; To, C.; Weaverdyck, N.; Yanny, B.
Bibliographical reference
The Astrophysical Journal
Advertised on:
12
2023
Journal
Citations
3
Refereed citations
2
Description
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. * This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile.
Related projects
Cosmology with Large Scale Structure Probes
The Cosmic Microwave Background (CMB) contains the statistical information about the early seeds of the structure formation in our Universe. Its natural counterpart in the local universe is the distribution of galaxies that arises as a result of gravitational growth of those primordial and small density fluctuations. The characterization of the
FRANCISCO SHU
KITAURA JOYANES