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

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.

Authors:
; ; ;  [1];  [2];  [3]; ;  [4]; ; ; ;  [5];  [6];  [7];  [8];  [9];  [10]
  1. Departamento de Ciencias Físicas, Facultad de Ciencias Exactas, Universidad Andrés Bello, Av. Fernández Concha 700, Las Condes, Santiago (Chile)
  2. Astronomisches Rechen-Institut, Zentrum fuer Astronomie der Universitaet Heidelberg, Moenchhofstr. 12-14, D-69120 Heidelberg (Germany)
  3. Mount Saint Vincent University, Halifax, Nova Scotia (Canada)
  4. European Southern Observatory, Karl-Schwarszchild-Str. 2, D-85748 Garching bei Muenchen (Germany)
  5. Instituto Milenio de Astrofísica, Santiago (Chile)
  6. Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh, EH9 3HJ (United Kingdom)
  7. Pontificia Universidad Católica de Chile, Instituto de Astrofisica, Av. Vicuna Mackenna 4860, Santiago (Chile)
  8. Institute of Astronomy, Cambridge University, Cambridge, CB3 0HA (United Kingdom)
  9. Department of Astronomy, University of Hertfordshire, Hertfordshire (United Kingdom)
  10. Departamento de Física, Universidade Federal de Santa Catarina, Trindade 88040-900, Florianópolis, SC (Brazil)
Publication Date:
OSTI Identifier:
22663725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (Online); Journal Volume: 153; Journal Issue: 4; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DENSITY; DISTANCE; GALACTIC EVOLUTION; IMAGES; MILKY WAY; NEAR INFRARED RADIATION; SPATIAL DISTRIBUTION; VARIABLE STARS

Citation Formats

Minniti, Dante, Palma, Tali, Pullen, Joyce, Tissera, Patricia, Dékány, Istvan, Majaess, Daniel, Rejkuba, Marina, Valenti, Elena, Alonso-García, Javier, Catelan, Marcio, Contreras Ramos, Rodrigo, Zoccali, Manuela, Gonzalez, Oscar A., Hempel, Maren, Irwin, Mike, Lucas, Philip W., and Saito, Roberto K. Characterization of the VVV Survey RR Lyrae Population across the Southern Galactic Plane. United States: N. p., 2017. Web. doi:10.3847/1538-3881/AA5BE4.
Minniti, Dante, Palma, Tali, Pullen, Joyce, Tissera, Patricia, Dékány, Istvan, Majaess, Daniel, Rejkuba, Marina, Valenti, Elena, Alonso-García, Javier, Catelan, Marcio, Contreras Ramos, Rodrigo, Zoccali, Manuela, Gonzalez, Oscar A., Hempel, Maren, Irwin, Mike, Lucas, Philip W., & Saito, Roberto K. Characterization of the VVV Survey RR Lyrae Population across the Southern Galactic Plane. United States. doi:10.3847/1538-3881/AA5BE4.
Minniti, Dante, Palma, Tali, Pullen, Joyce, Tissera, Patricia, Dékány, Istvan, Majaess, Daniel, Rejkuba, Marina, Valenti, Elena, Alonso-García, Javier, Catelan, Marcio, Contreras Ramos, Rodrigo, Zoccali, Manuela, Gonzalez, Oscar A., Hempel, Maren, Irwin, Mike, Lucas, Philip W., and Saito, Roberto K. Sat . "Characterization of the VVV Survey RR Lyrae Population across the Southern Galactic Plane". United States. doi:10.3847/1538-3881/AA5BE4.
@article{osti_22663725,
title = {Characterization of the VVV Survey RR Lyrae Population across the Southern Galactic Plane},
author = {Minniti, Dante and Palma, Tali and Pullen, Joyce and Tissera, Patricia and Dékány, Istvan and Majaess, Daniel and Rejkuba, Marina and Valenti, Elena and Alonso-García, Javier and Catelan, Marcio and Contreras Ramos, Rodrigo and Zoccali, Manuela and Gonzalez, Oscar A. and Hempel, Maren and Irwin, Mike and Lucas, Philip W. and Saito, Roberto K.},
abstractNote = {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.},
doi = {10.3847/1538-3881/AA5BE4},
journal = {Astronomical Journal (Online)},
number = 4,
volume = 153,
place = {United States},
year = {Sat Apr 01 00:00:00 EDT 2017},
month = {Sat Apr 01 00:00:00 EDT 2017}
}