THREE-DIMENSIONAL MAPS OF THE MAGELLANIC CLOUDS USING RR LYRAE STARS AND CEPHEIDS. I. THE LARGE MAGELLANIC CLOUD

The new data for Cepheids and RR Lyrae stars of the Optical Gravitational Lensing Experiment (OGLE III) survey allow us to study the three-dimensional distribution of stars corresponding to young (a few tens to a few hundreds of millions of years) and old (typically older than ~9 Gyr) populations of...

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Bibliographic Details
Published in:The Astronomical journal 2012-10, Vol.144 (4), p.1-13
Main Authors: Haschke, Raoul, Grebel, Eva K, DUFFAU, SONIA
Format: Article
Language:English
Subjects:
ASTRONOMY
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Cepheid variables
CEPHEIDS
COLOR
DISTANCE
GRAVITATIONAL LENSES
INCLINATION
INDICATORS
MAGELLANIC CLOUDS
PHOTOMETRY
Stands
Stars
Three dimensional
THREE-DIMENSIONAL CALCULATIONS
Variable stars
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Summary:The new data for Cepheids and RR Lyrae stars of the Optical Gravitational Lensing Experiment (OGLE III) survey allow us to study the three-dimensional distribution of stars corresponding to young (a few tens to a few hundreds of millions of years) and old (typically older than ~9 Gyr) populations of the Large Magellanic Cloud (LMC) traced by these variable stars. Three-dimensional maps are obtained by using individual reddening estimates derived from the intrinsic color of these stars. The resulting median distances of the RR Lyrae stars and Cepheids appear to resolve the long and short distance scale problem for our sample. With median distances of 53.1 + or - 3.2 kpc for the RR Lyrae stars and 53.9 + or - 1.8 kpc for the Cepheids, these two distance indicators are in very good agreement with each other in contrast to a number of earlier studies. The bar stands out as an overdensity both in RR Lyrae stars and in Cepheids.
ISSN:0004-6256
1538-3881
1538-3881
DOI:10.1088/0004-6256/144/4/106