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J/ApJ/721/L28 The split RC of the Galactic Bulge from OGLE-III (Nataf+, 2010)
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Beginning of ReadMe :J/ApJ/721/L28 Red clump stars in Galactic Bulge from OGLE-III (Nataf+, 2010)
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The split red clump of the Galactic Bulge from OGLE-III.
Nataf D.M., Udalski A., Gould A., Fouque P., Stanek K.Z.
<Astrophys. J., 721, L28-L32 (2010)>
=2010ApJ...721L..28N
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ADC_Keywords: Milky Way ; Stars, horizontal branch ; Photometry, VRI
Keywords: Galaxy: bulge - Galaxy: structure - stars: horizontal-branch
Abstract:
The red clump (RC) is found to be split into two components along
several sightlines toward the Galactic bulge. This split is detected
with high significance toward the areas (-3.5<l<1,b<-5) and
(l,b)=(0,+5.2), i.e., along the bulge minor axis and at least 5 deg
off the plane. The fainter (hereafter "main") component is the one
that more closely follows the distance-longitude relation of the bulge
RC. The main component is 0.5mag fainter than the secondary component
and with an overall approximately equal population. For sightlines
further from the plane, the difference in brightness increases, and
more stars are found in the secondary component than in the main
component. The two components have very nearly equal (V-I) color.
Description:
OGLE-III (Udalski et al. 2003AcA....53..291U, 2008AcA....58...69U,
Szymanski et al. 2011AcA....61...83S) observations were obtained from
the 1.3m Warsaw Telescope, located at the Las Campanas Observatory in
Chile. We use observations from a mosaic of 267 fields directed toward
the Galactic bulge, which are almost entirely within the range
-10<l<10 and 2<|b|<7 (see Figure 1). An investigation of the red clump
(RC) across the entire OGLE-III Galactic bulge data set is in progress
(D. M. Nataf et al. 2012arXiv1208.1263N).