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J/ApJ/678/851        RR Lyrae survey in the Galactic Halo      (Keller+, 2008)

Revealing substructure in the Galactic Halo: the SEKBO RR Lyrae survey. Keller S.C., Murphy S., Prior S., Dacosta G., Schmidt B. <Astrophys. J., 678, 851-864 (2008)> =2008ApJ...678..851K
ADC_Keywords: Photometry, VRI ; Stars, variable ; Stars, distances Keywords: Galaxy: halo - Galaxy: structure - stars: variables: other Abstract: We present a search for RR Lyrae variable stars from archival observations of the Southern Edgeworth-Kuiper Belt Object survey. The survey covers 1675deg2 along the ecliptic to a mean depth of V=19.5, i.e., a heliocentric distance of ∼50kpc for RR Lyrae stars. The survey reveals 2016 RR Lyrae candidates. Follow-up photometric monitoring of a subset of these candidates shows ∼24% contamination by non-RR Lyrae variables. We derive a map of overdensity of RR Lyrae stars in the halo that reveals a series of structures coincident with the leading and trailing arms of debris from the Sagittarius dwarf galaxy. One of the regions of overdensity is found on the trailing arm, 200° from the main body of the Sagittarius dwarf at a distance of ∼45kpc. This distant detection of the stellar population of the outer trailing arm of Sagittarius offers a tight constraint on the motion of the dwarf galaxy. A distinctly separate region of overdensity is seen toward the Virgo overdensity. Description: The present study is based on the archived observations of the Southern Edgeworth-Kuiper Belt Object (SEKBO) survey (Moody et al. 2003EM&P...92..125M). SEKBO was a multiepoch, two-color imaging survey of a 10° band centered on the ecliptic. Observations were obtained over the 3 years from December 1999 on the Mount Stromlo Observatory 50 inch (1.27) Great Melbourne Telescope that was previously used for the MACHO microlensing survey. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 60 2016 Table of RR Lyrae candidates found in the present work
See also: J/MNRAS/375/1381 : Kinematics of RR Lyr and HB stars in NGP (Kinman+, 2007) J/AJ/132/714 : QUEST RR Lyrae survey. II. Halo overdensities (Vivas+, 2006) J/A+A/375/909 : RR Lyrae stars in the Sgr dwarf (Cseresnjes 2001) J/A+A/357/871 : RR Lyrae stars in the Sgr dwarf galaxy (Cseresnjes+, 2000) J/AcA/48/113 : OGLE RR Lyrae VI photometry (Udalski, 1998) J/AJ/115/168 : Kinematics of red giant and RR Lyrae stars (Chiba+ 1998) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 12 A12 --- objID [0-9. ] Object identification 14- 15 I2 h RAh Hour of Right Ascension (J2000) 17- 18 I2 min RAm Minute of Right Ascension (J2000) 20- 24 F5.2 s RAs Second of Right Ascension (J2000) 26 A1 --- DE- Sign of the Declination (J2000) 27- 28 I2 deg DEd Degree of Declination (J2000) 30- 31 I2 arcmin DEm Arcminute of Declination (J2000) 33- 37 F5.2 arcsec DEs Arcsecond of Declination (J2000) 39- 43 F5.2 mag Vmag The V band magnitude (transformed to Landolt) 45- 49 F5.2 mag V-R The (V-R) color index 51- 55 F5.3 mag E(V-R) The (V-R) color excess 57- 60 F4.1 kpc DistH Heliocentric distance
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 20-Sep-2010
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