Spatial and velocity clumping in a Sloan Digital Sky Survey blue horizontal branch star catalogue
@article{Kinman2006SpatialAV, title={Spatial and velocity clumping in a Sloan Digital Sky Survey blue horizontal branch star catalogue}, author={L. ClewleyT.D. Kinman}, journal={Monthly Notices of the Royal Astronomical Society: Letters}, year={2006}, volume={371} }
We present evidence for eight new clumps of blue horizontal branch (BHB) stars discovered in a catalogue of these stars compiled from the Sloan Digital Sky Survey (SDSS) by Sirko et al. published in 2004. Clumps are identified by selecting pairs of stars separated by distances 6 2 kpc and with differences in galactocentric radial velocities < 25 km/s. Each clump contains four or more stars. Four of the clumps have supporting evidence: two of them also contain overdensities of RR Lyrae stars…
15 Citations
SPECTROSCOPY OF BRIGHT QUEST RR LYRAE STARS: VELOCITY SUBSTRUCTURES TOWARD VIRGO
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- 2008
Using a sample of 43 bright (V < 16.1, distance <13 kpc) RR Lyrae stars (RRLS) from the QUasar Equatorial Survey with spectroscopic radial velocities and metallicities, we find that several separate…
HALO VELOCITY GROUPS IN THE PISCES OVERDENSITY
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We report spectroscopic observations of five faint (V ∼ 20) RR Lyrae stars associated with the Pisces overdensity conducted with the Gemini South Telescope. At a heliocentric and galactocentric…
Galactic Stellar Populations in the Era of the Sloan Digital Sky Survey and Other Large Surveys
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- 2012
Studies of stellar populations, understood to mean collections of stars with common spatial, kinematic, chemical, and/or age distributions, have been reinvigorated during the past decade by the…
A comprehensive view of the Virgo stellar stream
- Physics
- 2014
Radial velocities and metallicities have been measured for 82 RR Lyrae identified by the QUEST survey in the direction of the Virgo constellation. Distributed over 90 sq. deg. of the sky, they lie…
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- Physics
- 2010
A new moving group comprising at least four Blue Horizontal Branch (BHB) stars is identified at (l,b) = (65 deg, 48 deg). The horizontal branch at g0=18.9 magnitude implies a distance of 50 kpc from…
Mapping the Galactic Halo. VIII. Quantifying Substructure
- Physics
- 2009
We have measured the amount of kinematic substructure in the Galactic halo using the final data set from the Spaghetti project, a pencil-beam high-latitude sky survey. Our sample contains 101…
THE CENTURY SURVEY GALACTIC HALO PROJECT. III. A COMPLETE 4300 DEG 2 SURVEY OF BLUE HORIZONTAL BRANCH STARS IN THE METAL-WEAK THICK DISK AND INNER HALO
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- 2008
We present a complete spectroscopic survey of 2414 2MASS-selected blue horizontal branch (BHB) candidates selected over 4300 deg2 of the sky. We identify 655 BHB stars in this non-kinematically…
The Virgo Stellar Stream: Extended sample
- PhysicsProceedings of the International Astronomical Union
- 2009
Abstract We have completed a spectroscopic study of the “12.4 hr clump”, the second largest substructure in the Quasar Equatorial Survey Team (QUEST) catalog. First discovered as an over-density of…
Kinematic structure in the Galactic halo at the North Galactic Pole: RR Lyrae and BHB stars show different kinematics
- PhysicsProceedings of the International Astronomical Union
- 2006
Abstract Heliocentric (UVW) and galactocentric (VR VΦ VZ) space motions were derived for 38 RR Lyrae (RRL) and 79 blue horizontal branch (BHB) stars in a 200-sq degree area near the North Galactic…
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We present a quantitative measurement of the amount of clustering present in the inner $\sim30$ kpc of the stellar halo of the Andromeda galaxy (M31). For this we analyse the angular positions and…
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