SIMBAD references

2004A&A...419..533B - Astronomy and Astrophysics, volume 419, 533-541 (2004/5-4)

Palomar 13: A velocity dispersion inflated by binaries?


Abstract (from CDS):

Recently, combining radial velocities from Keck/HIRES echelle spectra with published proper motion membership probabilities, Cote et al. (2002ApJ...574..783C) observed a sample of 21 stars, probable members of Palomar 13, a globular cluster in the Galactic halo. Their projected velocity dispersion σp=2.2±0.4km/s gives a mass-to-light ratio M/LV=40+24–17, about one order of magnitude larger than the usual estimate for globular clusters. We present here radial velocities measured from three different CCD frames of commissioning observations obtained with the new ESO/VLT instrument FLAMES (Fibre Large Array Multi Element Spectrograph). From these data, now publicly available, we measure the homogeneous radial velocities of eight probable members of this globular cluster. A new projected velocity dispersion σp=0.6-0.9±0.3km/s implies Palomar 13 mass-to-light ratio M/LV=3-7, similar to the usual value for globular clusters. We discuss briefly the two most obvious reasons for the previous unusual mass-to-light ratio finding: binaries, now clearly detected, and more homogeneous data from the multi-fibre FLAMES spectrograph.

Abstract Copyright:

Journal keyword(s): Galaxy: globular clusters: individual: Palomar 13 - techniques: radial velocities - stars: kinematics - stars: population II

VizieR on-line data: <Available at CDS (J/A+A/419/533): table2.dat table3.dat>

CDS comments: Table 2, 1rst column : the second ID (Keck) is written Cl* Palomar 13 ORS NNN in Simbad.

Simbad objects: 47

goto Full paper

goto View the references in ADS

To bookmark this query, right click on this link: simbad:2004A&A...419..533B and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact