Near-infrared variability study of the central 2.3 × 2.3 arcmin(2) of the Galactic Centre - II. Identification of RR Lyrae stars in the Milky Way nuclear star cluster

Dong, Hui et. al.

Detalles Bibliográficos
Autores: Dong, Hui, Schödel, Rainer, Nogueras Lara, Francisco, Gallego Cano, Eulalia, Gallego Calvente, Teresa, Ghez, A.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2017
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/160684
Acceso en línea:http://hdl.handle.net/10261/160684
Access Level:acceso abierto
Palabra clave:Galaxy: centre
Infrared: stars
Stars: variables: RR Lyrae
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spelling Near-infrared variability study of the central 2.3 × 2.3 arcmin(2) of the Galactic Centre - II. Identification of RR Lyrae stars in the Milky Way nuclear star clusterDong, HuiSchödel, RainerNogueras Lara, FranciscoGallego Cano, EulaliaGallego Calvente, TeresaGhez, A.Galaxy: centreInfrared: starsStars: variables: RR LyraeDong, Hui et. al.Because of strong and spatially highly variable interstellar extinction and extreme source crowding, the faint (K ≥ 15) stellar population in the Milky Way's nuclear star cluster is still poorly studied. RR Lyrae stars provide us with a tool to estimate the mass of the oldest, relative dim stellar population. Recently, we analysed HST/WFC3/IR observations of the central 2.3 × 2.3 arcmin2 of the Milky Way and found 21 variable stars with periods between 0.2 and 1 d. Here, we present a further comprehensive analysis of these stars. The period- luminosity relationship of RR Lyrae is used to derive their extinctions and distances. Using multiple approaches, we classify our sample as 4 RRc stars, 4 RRab stars, 3 RRab candidates and 10 binaries. Especially, the four RRab stars show sawtooth light curves and fall exactly on to the Oosterhoff I division in the Bailey diagram. Compared to the RRab stars reported by Minniti et al., our new RRab stars have higher extinction (AK > 1.8) and should be closer to the Galactic Centre. The extinction and distance of one RRab stars match those for the Milky Way's nuclear star cluster given in previous works. We perform simulations and find that after correcting for incompleteness, there could be not more than 40 RRab stars within the Milky Way's nuclear star cluster and in our field of view. Through comparing with the known globular clusters of the Milky Way, we estimate that if there exists an old, metal-poor (-1.5 < [Fe/H] < -1) stellar population in the Milky Way nuclear star cluster on a scale of 5 × 5 pc, then it contributes at most 4.7 × 105 M⊙, i.e. ~18 per cent of the stellar mass. © 2017 The Authors.The research leading to these results has received funding from the European Research Council under the European Union's Seventh Framework Programme (FP7/2007-2013)/ERC grant agreement no [614922]. The work is also supported partly by NASA via the grant GO-14589, provided by the Space Telescope Science Institute. FN-L acknowledges financial support from an MECD predoctoral contract, code FPU14/01700. This work uses observations made with the NASA/ESA HST and the data archive at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS 5-26555.Peer reviewedOxford University PressEuropean Research CouncilNASAConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]201820182017info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/160684reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/EC/FP7/614922http://dx.doi.org/10.1093/mnras/stx1836Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1606842026-05-22T06:33:51Z
dc.title.none.fl_str_mv Near-infrared variability study of the central 2.3 × 2.3 arcmin(2) of the Galactic Centre - II. Identification of RR Lyrae stars in the Milky Way nuclear star cluster
title Near-infrared variability study of the central 2.3 × 2.3 arcmin(2) of the Galactic Centre - II. Identification of RR Lyrae stars in the Milky Way nuclear star cluster
spellingShingle Near-infrared variability study of the central 2.3 × 2.3 arcmin(2) of the Galactic Centre - II. Identification of RR Lyrae stars in the Milky Way nuclear star cluster
Dong, Hui
Galaxy: centre
Infrared: stars
Stars: variables: RR Lyrae
title_short Near-infrared variability study of the central 2.3 × 2.3 arcmin(2) of the Galactic Centre - II. Identification of RR Lyrae stars in the Milky Way nuclear star cluster
title_full Near-infrared variability study of the central 2.3 × 2.3 arcmin(2) of the Galactic Centre - II. Identification of RR Lyrae stars in the Milky Way nuclear star cluster
title_fullStr Near-infrared variability study of the central 2.3 × 2.3 arcmin(2) of the Galactic Centre - II. Identification of RR Lyrae stars in the Milky Way nuclear star cluster
title_full_unstemmed Near-infrared variability study of the central 2.3 × 2.3 arcmin(2) of the Galactic Centre - II. Identification of RR Lyrae stars in the Milky Way nuclear star cluster
title_sort Near-infrared variability study of the central 2.3 × 2.3 arcmin(2) of the Galactic Centre - II. Identification of RR Lyrae stars in the Milky Way nuclear star cluster
dc.creator.none.fl_str_mv Dong, Hui
Schödel, Rainer
Nogueras Lara, Francisco
Gallego Cano, Eulalia
Gallego Calvente, Teresa
Ghez, A.
author Dong, Hui
author_facet Dong, Hui
Schödel, Rainer
Nogueras Lara, Francisco
Gallego Cano, Eulalia
Gallego Calvente, Teresa
Ghez, A.
author_role author
author2 Schödel, Rainer
Nogueras Lara, Francisco
Gallego Cano, Eulalia
Gallego Calvente, Teresa
Ghez, A.
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv European Research Council
NASA
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Galaxy: centre
Infrared: stars
Stars: variables: RR Lyrae
topic Galaxy: centre
Infrared: stars
Stars: variables: RR Lyrae
description Dong, Hui et. al.
publishDate 2017
dc.date.none.fl_str_mv 2017
2018
2018
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/160684
url http://hdl.handle.net/10261/160684
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/EC/FP7/614922
http://dx.doi.org/10.1093/mnras/stx1836
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Oxford University Press
publisher.none.fl_str_mv Oxford University Press
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,198674

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