J/AJ/134/1579 Halo stars in solar neighborhood (Kepley+, 2007)
Halo star streams in the solar neighborhood.
Kepley A.A., Morrison H.L., Helmi A., Kinman T.D., Van Duyne J.,
Martin J.C., Harding P., Norris J.E., Freeman K.C.
<Astron. J., 134, 1579-1595 (2007)>
=2007AJ....134.1579K 2007AJ....134.1579K
ADC_Keywords: Stars, nearby ; Stars, giant ; Stars, variable ;
Radial velocities ; Space velocities
Keywords: Galaxy: halo - Galaxy: kinematics and dynamics -
methods: statistical - solar neighborhood
Abstract:
We have assembled a sample of halo stars in the solar neighborhood to
look for halo substructure in velocity and angular momentum space. Our
sample (231 stars) includes red giants, RR Lyrae variable stars, and
red horizontal branch stars within 2.5kpc of the Sun with [Fe/H] less
than -1.0. It was chosen to include stars with accurate distances,
space velocities, and metallicities, as well as well-quantified
errors. With our data set, we confirm the existence of the streams
found by Helmi and coworkers (1999Natur.402...53H 1999Natur.402...53H), which we refer to
as the H99 streams.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 85 136 Combined sample red giants and RHB stars
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See also:
J/AJ/115/168 : Kinematics of red giant and RR Lyrae stars (Chiba+ 1998)
J/AJ/119/2866 : Proper motions of metal-poor stars (Beers+, 2000)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- Name Object name (1)
20- 25 F6.1 km/s HRV Heliocentric radial velocity
27- 30 F4.2 kpc Dist Heliocentric distance
32- 35 F4.2 kpc e_Dist ? Median error in Dist
37- 41 F5.2 [Sun] [Fe/H] Metallicity
43- 49 F7.2 km/s Vr Radial velocity relative to galactic center (3)
51- 54 F4.1 km/s e_Vr ? Median error in RV
56- 62 F7.2 km/s Vphi Circular velocity relative to galactic center (3)
64- 67 F4.1 km/s e_Vphi ? Median error in Vphi
69- 75 F7.2 km/s Vz Scale height velocity relative
to galactic center (3)
77- 80 F4.1 km/s e_Vz ? Median error in Vz
82- 85 A4 --- Ref Data source (2)
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Note (1): See Section 2.2 for details and Morrison et al. (2007, in prep.)
for the RR Lyrae data.
Note (2): Data source as follows:
CY98 = Chiba & Yoshii (1998, Cat. J/AJ/115/168)
B00 = Beers et al. (2000, Cat. J/AJ/119/2866)
Note (3): See Appendix A of Kepley et al. (2007AJ....133.2242K 2007AJ....133.2242K) for a
description of the coordinate system.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 11-Nov-2009