2006A&A...456..517M


Query : 2006A&A...456..517M

2006A&A...456..517M - Astronomy and Astrophysics, volume 456, 517-522 (2006/9-3)

Absolute motions of globular clusters. II. HST astrometry and VLT radial velocities in NGC 6397.

MILONE A.P., VILLANOVA S., BEDIN L.R., PIOTTO G., CARRARO G., ANDERSON J., KING I.R. and ZAGGIA S.

Abstract (from CDS):

In this paper we present a new, accurate determination of the three components of the absolute space velocity of the Galactic globular cluster NGC 6397 (l≃338°, b≃-12°). We used three HST/WFPC2 fields with multi-epoch observations to obtain astrometric measurements of objects in three different fields in this cluster. The identification of 33 background galaxies with sharp nuclei allowed us to determine an absolute reference point and measure the absolute proper motion of the cluster. The third component was obtained from radial velocities measured from spectra from the multi-fiber spectrograph FLAMES at UT2-VLT. We find (µαcosδ,µδ)J2000.0=(+3.39±0.15, -17.55±0.15)mas/yr and Vrad=+18.36±0.09(±0.10)km/s. Assuming a Galactic potential, we calculate the cluster orbit for various assumed distances and briefly discuss the implications.

Abstract Copyright:

Journal keyword(s): astrometry - globular clusters: individual: NGC 6397 - techniques: spectroscopic - Galaxy: kinematics and dynamics

CDS comments: Fig.1 Fields A,B,C and D not in Simbad.

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1784 0
2 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 1911 0

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2023.02.04-09:37:39

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