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J/ApJ/721/L28   Red clump stars in Galactic Bulge from OGLE-III  (Nataf+, 2010)

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
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). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 59 5085 Red clump (RC) stars which have been tabulated from 21 high-confidence sightlines
See also: J/AcA/52/217 : OGLE II. VI photometry of Galactic Bulge (Udalski+, 2002) : OGLE-III Photometric Maps of the Galactic bulge : OGLE home page Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 5 F5.1 --- Field [127.4/357.8] Subfield (FFF.F) 7- 12 I6 --- Seq OGLE-III sequence number (NNNNNN) 14- 22 A9 --- Status Status (Main or Secondary) (1) 24- 25 I2 h RAh [17/18] Hour of right ascension (J2000) 27- 28 I2 min RAm Minute of right ascension (J2000) 30- 34 F5.2 s RAs Second of right ascension (J2000) 36 A1 --- DE- [-] Sign of declination (J2000) 37- 38 I2 deg DEd [25/35] Degree of declination (J2000) 40- 41 I2 arcmin DEm Arcminute of declination (J2000) 43- 46 F4.1 arcsec DEs Arcsecond of declination (J2000) 48- 52 F5.3 mag V-I [1.27/2.27] V-I color index (1) 54- 59 F6.3 mag Imag [14.50/16.19] I-band magnitude (1)
Note (1): Selected stars had a (V-I) within 0.15mag that of the fit, and were assigned "Main" (Faint) or "Secondary" (Bright) status if their I-band brightness was within 0.15mag of the fit value. V-I and I might be off by ∼0.02mag in some cases as it is based on OGLE-III photometry before final release.
Nomenclature Notes: Stars are named <OGLE BLGFFF.F NNNNNN> in Simbad, from the field number (FFF.F) and the sequence number (NNNNNN). Acknowledgements: David M. Nataf <nataf(at)>
(End) Emmanuelle Perret [CDS] 10-Jul-2012
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