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 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 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