University of Hertfordshire

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

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  • Dante Minniti
  • Istvan Dékány
  • Daniel Majaess
  • Tali Palma
  • Joyce Pullen
  • Marina Rejkuba
  • Javier Alonso-García
  • Marcio Catelan
  • Rodrigo Contreras Ramos
  • Oscar A. Gonzalez
  • Maren Hempel
  • Mike Irwin
  • Philip W. Lucas
  • Roberto K. Saito
  • Patricia Tissera
  • Elena Valenti
  • Manuela Zoccali
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Original languageEnglish
Number of pages10
JournalThe Astronomical Journal
Publication statusPublished - 27 Mar 2017


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.


This is an author created, un-copyedited version of an article published in The Astronomical Journal. Under embargo. Embargo end date: 27 March 2018. IOP Publishing is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at doi:

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