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20 April 2024 |
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Article overview
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Open Clusters as Galactic Disk Tracers: I. Project Motivation, Cluster Membership and Bulk Three-Dimensional Kinematics | | Peter M. Frinchaboy
; Steven R. Majewski
; | | Date: |
29 Apr 2008 | | Abstract: | We have begun a survey of the chemical and dynamical properties of the Milky
Way disk as traced by open star clusters. In this first contribution, the
general goals of our survey are outlined and the strengths and limitations of
using star clusters as a Galactic disk tracer sample are discussed. We also
present medium resolution (R ~ 15,0000) spectroscopy of open cluster stars
obtained with the Hydra multi-object spectrographs on the Cerro Tololo
Inter-American Observatory 4-m and WIYN 3.5-m telescopes. Here we use these
data to determine the radial velocities of 3436 stars in the fields of open
clusters within about 3 kpc, with specific attention to stars having proper
motions in the Tycho-2 catalog. Additional radial velocity members (without
Tycho-2 proper motions) that can be used for future studies of these clusters
were also identified. The radial velocities, proper motions, and the angular
distance of the stars from cluster center are used to derive cluster membership
probabilities for stars in each cluster field using a non-parametric approach,
and the cluster members so-identified are used, in turn, to derive the reliable
bulk three-dimensional motion for 66 of 71 targeted open clusters. The high
probability cluster members that we identify help to clarify the
color-magnitude sequences for many of the clusters, and are prime targets for
future echelle resolution spectroscopy as well as astrometric study with the
Space Interferometry Mission (SIM Planetquest). | | Source: | arXiv, 0804.4630 | | Services: | Forum | Review | PDF | Favorites | |
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