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Kinematics of RR Lyrae stars in the Galactic bulge with OGLE-IV and Gaia DR2

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cris.lastimport.scopus2024-02-12T20:15:20Z
dc.abstract.enWe analyse the kinematics and spatial distribution of 15 599 fundamental-mode RR Lyrae (RRL) stars in the Milky Way bulge by combining OGLE-IV photometric data and Gaia DR2 proper motions. We show that the longitudinal proper motions and the line-of-sight velocities can give similar results for the rotation in the Galactic central regions. The angular velocity of bulge RRLs is found to be around 35 km s<SUP>-1</SUP> kpc<SUP>-1</SUP>, significantly smaller than that for the majority of bulge stars (50-60 km s<SUP>-1</SUP> kpc<SUP>-1</SUP>); bulge RRLs have larger velocity dispersion (120-140 km s<SUP>-1</SUP>) than younger stars. The dependence of the kinematics of the bulge RRLs on their metallicities is shown by their rotation curves and spatial distributions. Metal-poor RRLs ([Fe/H]<-1) show a smaller bar angle than metal-rich ones. We also find clues suggesting that RRLs in the bulge are not dominated by halo stars. These results might explain some previous conflicting results over bulge RRLs and help understand the chemodynamical evolution of the Galactic bulge.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorDu, Hangci
dc.contributor.authorMao, Shude
dc.contributor.authorAthanassoula, E.
dc.contributor.authorShen, Juntai
dc.contributor.authorPietrukowicz, Paweł
dc.date.accessioned2024-01-25T04:47:28Z
dc.date.available2024-01-25T04:47:28Z
dc.date.copyright2020-07-02
dc.date.issued2020
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.number4
dc.description.versionORIGINAL_AUTHOR
dc.description.volume498
dc.identifier.doi10.1093/MNRAS/STAA2601
dc.identifier.issn0035-8711
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/110360
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2020MNRAS.498.5629D
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.relation.pages5629-5642
dc.rightsOther
dc.sciencecloudnosend
dc.titleKinematics of RR Lyrae stars in the Galactic bulge with OGLE-IV and Gaia DR2
dc.typeJournalArticle
dspace.entity.typePublication