Mathematics – Logic
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8174v&link_type=abstract
HST Proposal ID #8174
Mathematics
Logic
Hst Proposal Id #8174 Stellar Populations In Clusters
Scientific paper
We propose to determine the internal velocity distribution of the globular clusters NGC 6205 {M13} and NGC 6656 {M22} in their cores and, for NGC 6656, as a function of distance from the cluster center, and thus also infer its mass distribution. In addition to measuring the velocity dispersion and any anisotropy to 1 km s^-1 for various classes of stars, { e.g. giants, dwarfs, blue stragglers}, we hope to better quantify the suspected rotation {and hence cluster inclination} apparent in both of these clusters' radial velocity data. We will also derive kinematic distances for the two clusters by comparison to existing radial velocity data. These distances would be good to 1-3 if the radial velocity data were of the expected accuracy of the proper motions. Instead, we will be limited by the radial velocities to 6 accuracy, which should still have considerable impact on the derived luminosities of the RR Lyrae stars and their role in the cosmological distance scale. The H ST Astrometry Science Team obtaine d GTO first- epoch exposures of the above clusters and three others {NGC 104, NGC 6752, and NGC 7078}. The HST AST and its collaborators were granted Cycle 7 GO time to observe these latter three clusters and those observations are currently pending. In this proposal, we are requesting second-epoch exposures under GO time for the remaining two clusters, NGC 6205 and NGC 6656.
No associations
LandOfFree
Internal Velocity Distribution in Globular Clusters, II does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Internal Velocity Distribution in Globular Clusters, II, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Internal Velocity Distribution in Globular Clusters, II will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-992773