A DECam view of the diffuse dwarf galaxy Crater II – Variable stars

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dc.contributor.authorVivas, A. Katherina
dc.contributor.authorWalker, Alistair R.
dc.contributor.authorMartínez-Vazquez, Clara E.
dc.contributor.authorMonelli, Matteo
dc.contributor.authorBono, Giuseppe
dc.contributor.authorDorta, Antonio
dc.contributor.authorNidever, David L.
dc.contributor.authorFiorentino, Giuliana
dc.contributor.authorGallart, Carme
dc.contributor.authorAndreuzzi, Gloria
dc.contributor.authorBraga, Vittorio F.
dc.contributor.authorDall’Ora, Massimo
dc.contributor.authorOlsen, Knut
dc.contributor.authorStetson, Peter B.
dc.date.accessioned2021-10-27T14:02:34Z
dc.date.available2021-10-27T14:02:34Z
dc.date.issued2020-02
dc.description.abstractTime series observations of a single dithered field centred on the diffuse dwarf satellite galaxy Crater II were obtained with the Dark Energy Camera (DECam) at the 4m Blanco Telescope at Cerro Tololo Inter-American Observatory, Chile, uniformly covering up to two half-light radii. Analysis of the g and i time series results in the identification and characterization of 130 periodic variable stars, including 98 RR Lyrae stars, 7 anomalous Cepheids, and 1 SX Phoenicis star belonging to the Crater II population, and 24 foreground variables of different types. Using the large number of ab-type RR Lyrae stars present in the galaxy, we obtained a distance modulus to Crater II of (m - M)0 = 20.333 ± 0.004 (stat) ± 0.07 (sys). The distribution of the RR Lyrae stars suggests an elliptical shape for Crater II, with an ellipticity of 0.24 and a position angle of 153°. From the RR Lyrae stars, we infer a small metallicity dispersion for the old population of Crater II of only 0.17 dex. There are hints that the most metal-poor stars in that narrow distribution have a wider distribution across the galaxy, while the slightly more metal-rich part of the population is more centrally concentrated. Given the features in the colour-magnitude diagram of Crater II, the anomalous Cepheids in this galaxy must have formed through a binary evolution channel of an old population. © 2019 The Author(s)es
dc.description.sponsorshipIndexación: Scopuses
dc.identifier.citationMonthly Notices of the Royal Astronomical Society Open Access Volume 492, Issue 1, Pages 1061 - 10771 February 2020es
dc.identifier.issn00358711
dc.identifier.urihttp://repositorio.unab.cl/xmlui/handle/ria/20660
dc.language.isoenes
dc.publisherOxford University Presses
dc.subjectGalaxies: dwarf; Galaxies: individual: (Crater II); Galaxies: stellar content; Local Group; Stars: variables: general; Stars: variables: RR Lyraees
dc.titleA DECam view of the diffuse dwarf galaxy Crater II – Variable starses
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