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Ancient Stars Beyond the Local Group: RR Lyrae Variables and Blue Horizontal Branch Stars in Sculptor Group Dwarf Galaxies

Da Costa, Gary; Rejkuba, Marina; Jerjen, Helmut; Grebel, E.

Description

We have used Hubble Space Telescope Advanced Camera for Surveys images to generate color-magnitude diagrams that reach below the magnitude of the horizontal branch in the Sculptor Group dwarf galaxies ESO294-010 and ESO410-005. In both diagrams, blue horizontal branch stars are unambiguously present, a signature of the existence of an ancient stellar population whose age is comparable to that of the Galactic halo globular clusters. The result is reinforced by the discovery of numerous RR Lyrae...[Show more]

dc.contributor.authorDa Costa, Gary
dc.contributor.authorRejkuba, Marina
dc.contributor.authorJerjen, Helmut
dc.contributor.authorGrebel, E.
dc.date.accessioned2015-12-08T22:38:28Z
dc.identifier.issn0004-637X
dc.identifier.urihttp://hdl.handle.net/1885/35830
dc.description.abstractWe have used Hubble Space Telescope Advanced Camera for Surveys images to generate color-magnitude diagrams that reach below the magnitude of the horizontal branch in the Sculptor Group dwarf galaxies ESO294-010 and ESO410-005. In both diagrams, blue horizontal branch stars are unambiguously present, a signature of the existence of an ancient stellar population whose age is comparable to that of the Galactic halo globular clusters. The result is reinforced by the discovery of numerous RR Lyrae variables in both galaxies. The occurrence of these stars is the first direct confirmation of the existence of ancient stellar populations beyond the Local Group and indicates that star formation can occur at the earliest epochs even in low-density environments.
dc.publisherIOP Publishing
dc.sourceAstrophysical Journal, The
dc.subjectKeywords: Galaxies: dwarf; Galaxies: individual (ESO 294-010, ESO 410-005); Galaxies: stellar content; Stars: horizontal-branch; Stars: variables: other
dc.titleAncient Stars Beyond the Local Group: RR Lyrae Variables and Blue Horizontal Branch Stars in Sculptor Group Dwarf Galaxies
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume708
dc.date.issued2010
local.identifier.absfor020103 - Cosmology and Extragalactic Astronomy
local.identifier.ariespublicationu3356449xPUB129
local.type.statusPublished Version
local.contributor.affiliationDa Costa, Gary, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationRejkuba, Marina, European Southern Observatory
local.contributor.affiliationJerjen, Helmut, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationGrebel, E., Universitat Heidelberg
local.description.embargo2037-12-31
local.bibliographicCitation.issue2
local.bibliographicCitation.startpageL121
local.bibliographicCitation.lastpageL125
local.identifier.doi10.1088/2041-8205/708/2/L121
dc.date.updated2016-02-24T09:53:46Z
local.identifier.scopusID2-s2.0-77949516721
local.identifier.thomsonID000273308000011
CollectionsANU Research Publications

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