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        Characterization of the VVV Survey RR Lyrae Population across the Southern Galactic Plane

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        Accepted_Manuscript.pdf (PDF, 3Mb)
        Author
        Minniti, Dante
        Dékány, Istvan
        Majaess, Daniel
        Palma, Tali
        Pullen, Joyce
        Rejkuba, Marina
        Alonso-García, Javier
        Catelan, Marcio
        Ramos, Rodrigo Contreras
        Gonzalez, Oscar A.
        Hempel, Maren
        Irwin, Mike
        Lucas, Philip W.
        Saito, Roberto K.
        Tissera, Patricia
        Valenti, Elena
        Zoccali, Manuela
        Attention
        2299/19521
        Abstract
        Deep near-IR images from the VISTA Variables in the Vía Láctea (VVV) Survey were used to search for RR Lyrae stars in the Southern Galactic plane. A sizable sample of 404 RR Lyrae of type ab stars was identified across a thin slice of the fourth Galactic quadrant (295° < ℓ < 350°, −2°.24 < b < −1°.05). The sample’s distance distribution exhibits a maximum density that occurs at the bulge tangent point, which implies that this primarily Oosterhoff type I population of RRab stars does not trace the bar delineated by their red clump counterparts. The bulge RR Lyrae population does not extend beyond ℓ ∼ 340°, and the sample’s spatial distribution presents evidence of density enhancements and substructure that warrants further investigation. Indeed, the sample may be employed to evaluate Galactic evolution models, and is particularly lucrative since half of the discovered RR Lyrae are within reach of Gaia astrometric observations.
        Publication date
        2017-03-27
        Published in
        The Astronomical Journal
        Published version
        https://doi.org/10.3847/1538-3881/aa5be4
        Other links
        http://hdl.handle.net/2299/19521
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