THE SPLIT RED CLUMP OF THE GALACTIC BULGE FROM OGLE-III

Journal Article · Mon Sep 20 00:00:00 EDT 2010 · Astrophysical Journal Letters

DOI:https://doi.org/10.1088/2041-8205/721/1/L28· OSTI ID:21452808

Nataf, D M; Gould, A; Stanek, K Z ^[1]; Udalski, A ^[2]; Fouque, P ^[3]

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1. Department of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH 43210 (United States)
2. Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa (Poland)
3. LATT, Universite de Toulouse, CNRS, 14 avenue Edouard Belin, 31400 Toulouse (France)

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 {approx}0.5 mag 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.

• OSTI ID: 21452808
• Journal Information: Astrophysical Journal Letters, Vol. 721, Issue 1; Other Information: DOI: 10.1088/2041-8205/721/1/L28; ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
BRIGHTNESS
COLOR
DISTANCE
GALAXIES
STARS
OPTICAL PROPERTIES
ORGANOLEPTIC PROPERTIES
PHYSICAL PROPERTIES