HST Astrometry of M4 and the Galactic Constant V_0/R_0

Abstract

From multi-epoch WFPC2/HST observations we present astrometric measurements of stars in the Galactic globular cluster M4 (NGC 6121) and in the foreground/background. The presence of an extragalactic point source allows us to determine the absolute proper motion of the cluster, and, through use of the field stars in this region only 18 degree from the Galactic center, to measure the difference between the Oort constants, A-B. We find: (mu_alpha cos dec, mu_dec)_J2000 = (-13.21 +/- 0.35, -19.28 +/- 0.35) mas/yr, and A-B = V_0/R_0 = 27.6 +/- 1.7 km / s / kpc.

arXiv comment20 pages, 6 figures, A.J.__ACCEPTED__, 1 April, 2003, (...!)

References in corpus (10)

• Database of Geneva stellar evolution tracks and isochrones for UBVRIJHKLL'M, HST-WFPC2, Geneva and Washington photometric systems
• Toward High-Precision Astrometry with WFPC2. I. Deriving an Accurate PSF
• The White Dwarf Cooling Sequence of the Globular Cluster Messier 4
• White Dwarfs in Globular Clusters: HST Observations of M4
• HST/WFPC2 proper motions in two bulge fields: kinematics and stellar population of the Galactic bulge
• Refining the Oort and Galactic constants
• The Luminosity Function of the Globular Cluster NGC 6397 Near the Limit of Hydrogen Burning
• The Lower Main Sequence and Mass Function of the Globular Cluster Messier 4
• Color--Magnitude Diagram and Luminosity Function of M4 Near the Hydrogen-Burning Limit
• Hubble Space Telescope Observations of White Dwarfs in the Globular Cluster M4

Cited by in corpus (53)

• Astrometry and photometry with HST WFC3. II. Improved geometric-distortion corrections for 10 filters of the UVIS channel
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters - XVII. Public Catalogue Release
• Hubble Space Telescope Proper Motion (HSTPROMO) Catalogs of Galactic Globular Clusters. I. Sample Selection, Data Reduction and NGC 7078 Results
• MOCCA Code for Star Cluster Simulations - II. Comparison with N-body Simulations
• Ground-Based CCD Astrometry with Wide Field Imagers. I. [Observations just a few years apart allow decontamination of field objects from members in two Globular clusters.]
• The Southern Proper Motion Program IV. The SPM4 Catalog
• The End of the White Dwarf Cooling Sequence in M4: an efficient approach
• X-ray Sources and their Optical Counterparts in the Globular Cluster M4
• Space Velocities of Southern Globular Clusters. V. A Low Galactic Latitude Sample
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters - XV. The dynamical clock: reading cluster dynamical evolution from the segregation level of blue straggler stars
• The orbits of 48 globular clusters in a Milky-Way-Like Barred Galaxy
• High Precision Astrometry with MICADO at the European Extremely Large Telescope
• The ubiquitous nature of the Horizontal Branch second U-jump: A link with the Blue Hook scenario?
• The 3D Velocity Structure of the Thick Disk from SPM4 and RAVE DR2
• Monte Carlo Simulations of Star Clusters - V. The globular cluster M4
• The HST Large Program on Omega Centauri. I. Multiple stellar populations at the bottom of the main sequence probed in NIR-Optical
• Kinematics and Chemistry of Stars Along the Sagittarius Trailing Tidal Tail and Constraints on the Milky Way Mass Distribution
• The M4 Core Project with HST -- II. Multiple Stellar Populations at the Bottom of the Main Sequence
• Tidal radii and destruction rates of globular clusters in the Milky Way due to bulge-bar and disk shocking
• Space Velocities of Southern Globular Clusters VII. NGC 6397, NGC 6626 (M 28) and NGC 6656 (M 22)
• Variable stars in one open cluster within the Kepler/K2-Campaign-5 field: M 67 (NGC 2682)
• Ground-based astrometry with wide field imagers. V. Application to near-infrared detectors: HAWK-I@VLT/ESO
• The absolute motion of the peculiar cluster NGC6791
• The HST large programme on $\omega$ Centauri -- III. Absolute proper motion
• Improved Hubble Space Telescope Proper Motions for Tycho-G and Other Stars in the Remnant of Tycho's Supernova 1572
• Absolute motions of globular clusters. II. [HST astrometry and VLT radial velocities in NGC6397]
• Absolute proper motion of the Galactic open cluster M67
• No surviving companion in Kepler's supernova
• Chandra and Hubble Space Telescope Study of the Globular Cluster NGC 288
• A comparative analysis of the observed white dwarf cooling sequence from globular clusters
• The OSACA Database and a Kinematic Analysis of Stars in the Solar Neighborhood
• The Galactic Inner Halo: Searching for White Dwarfs and Measuring the Fundamental Galactic Constant, Vo/Ro
• Mass modelling globular clusters in the Gaia era: a method comparison using mock data from an $N$-body simulation of M4
• Hubble Space Telescope observations of the Kepler-field cluster NGC 6819. I. The bottom of the white dwarf cooling sequence
• Extending Gaia DR2 with HST narrow-field astrometry: the WISE J154151.65-225024.9 test case
• Ground-based CCD astrometry with wide field imagers. IV. An improved Geometric Distortion Correction for the Blue prime-focus Camera at the LBT
• Hubble Space Telescope astrometry of the closest brown dwarf binary system -- I. Overview and improved orbit
• Tycho-Gaia Astrometric Solution Parallaxes and Proper Motions for Five Galactic Globular Clusters
• Measuring Fundamental Galactic Parameters with Stellar Tidal Streams and SIM PlanetQuest
• oMEGACat II -- Photometry and proper motions for 1.4 million stars in Omega Centauri and its rotation in the plane of the sky
• Faint Blue Objects in the Hubble Deep Field South Revealed: White Dwarfs, Subdwarfs, and Quasars
• The HST Large Programme on NGC 6752. III. Detection of the Peak of the White Dwarf Luminosity Function
• Median Statistics Estimate of the Galactic Rotational Velocity
• Hunting for Brown Dwarfs in the Globular Cluster M4: 2nd epoch HST NIR observations
• Deep near-IR observations of the Globular Cluster M4: Hunting for Brown Dwarfs
• The Pulsar-White Dwarf-Planet System in Messier 4: Improved Astrometry
• Photometry and astrometry with JWST -- II. NIRCam distortion correction
• The M4 Core Project with HST --- I. Overview and First-Epoch
• The VMC survey XXVIII. Improved measurements of the proper motion of the Galactic globular cluster 47 Tucanae
• Proper Motion Objects in the Hubble Deep Field
• Application of three-body stability to globular clusters: II. Observed velocity dispersions
• On the HI-Hole and AGB Stellar Population of the Sagittarius Dwarf Irregular Galaxy
• Precision Astrometry, Galactic Mergers, Halo Substructure and Local Dark Matter