Near-Field cosmology with RR Lyrae variable stars: A first view of substructure in the southern sky

2016/03/23 by S. Duffau, A. K. Vivas, Duffau, S. +21
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #Stellar, planetary, and galactic studies #astro-ph.GA

paper · pdf · doi:10.48550/arxiv.1607.01416

2 pages, 1 figure, to appear in the proceedings of the conference RRL2015 High-Precision Studies of RR Lyrae Stars

arxiv created 2016/03/23 · arxiv updated 2016/07/07

Abstract

We present an update of a spectroscopic follow-up survey at low-resolution of a large number of RR Lyrae halo overdensity candidates found in the southern sky. The substructure candidates were identified in the RR Lyrae catalog of Torrealba et al. (2015) using Catalina Real-time Transient Survey (CRTS) data. Radial velocities and mean metallicities have been estimated for target stars in almost half of the original overdensities to assess their potential membership to coherent halo features.

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