Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2009-05-21
Astrophys.J.704:1730-1734,2009
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
Accepted for publication in November 2009 issue of ApJ. 7 pages, 5 figures. Extinction map of the LMC available at http://ww
Scientific paper
10.1088/0004-637X/704/2/1730
We use the recently released OGLE-III catalog of 17692 fundamental mode RR Lyr (RRab) stars in the Large Magellanic Cloud (LMC) to investigate the structure of its stellar halo. We apply conservative cuts in period, amplitude and magnitude to remove blends and other contamination. We use period--luminosity and period--color relations to determine distance and extinction of every star in our final sample of 9393 stars. In order to determine the scatter of our method, we compare the distributions of distances in two regions at the edges of the covered area with a central region. We determine the intrinsic line-of-sight dispersion in the center to be 0.135 mag or 3.21 kpc (FWHM of 0.318 mag or 7.56 kpc), assuming zero depth in one of the edge regions. The conservative cuts we apply reduce the derived depth significantly. Furthermore, we find that the distribution of RRab stars is deformed in the sense that stars on the Eastern side are closer than on the Western side. We model the RRab distribution as a triaxial ellipsoid and determine its axes ratios to be 1:2.00:3.50 with the longest axis inclined by 6 degrees from the line of sight. Another result of our analysis is an extinction map of the LMC and a map of internal reddening, which we make publicly available.
Pejcha Ondrej
Stanek Kris Z.
No associations
LandOfFree
The Structure of the Large Magellanic Halo Stellar Halo Derived Using OGLE-III RR Lyr stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Structure of the Large Magellanic Halo Stellar Halo Derived Using OGLE-III RR Lyr stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Structure of the Large Magellanic Halo Stellar Halo Derived Using OGLE-III RR Lyr stars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-444297