Structural Characteristics of PALOMAR-14

Details Structural Characteristics of PALOMAR-14 Structural Characteristics of PALOMAR-14

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pasp...94..465h&link_type=abstract

Publications of the Astronomical Society of the Pacific, Vol. 94, P. 465, 1982

Astronomy and Astrophysics

Astronomy

3

Scientific paper

We describe new star counts around the sparse, distant outer halo cluster Palomar 14, which are used to derive its structural properties, i.e., core and tidal radii and central surface density. The relationship of these parameters to the galactic orbit of the cluster is discussed. Contrary to the recent study of Da Costa et al., we find that no useful estimates can be made for the perigalactic distance Rp or orbital eccentricity of Pal 14, primarily because of the severe combined uncertainties (a) in defining the observed tidal radius rt; (b) in the assumed M/L ratio of the cluster and the galactic mass model; and (c) in unambiguously relating rt to Rp for clusters this distant. More generally, because of these same problems, the kinematics of the outer Palomar-type clusters are likely to remain especially poorly understood within the globular cluster system as a whole.

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