Other
Scientific paper
Jul 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977aj.....82..459s&link_type=abstract
Astronomical Journal, vol. 82, July 1977, p. 459-464, 525.
Other
44
Abundance, Electrophotometry, Globular Clusters, Stellar Magnitude, Stellar Spectrophotometry, Ubv Spectra, Color-Magnitude Diagram, Giant Stars, Halos, Iron, Star Distribution, Wave Attenuation
Scientific paper
The color-magnitude diagram of the sparse remote globular cluster Palomar 5 is obtained from a UBVR photoelectric sequence of 29 stars covering the V-magnitude range from 13.4 to 18.6. It is found that the ratio of horizontal-branch (HB) stars to giants is unusually large in this cluster, the distribution of stars along the HB favors the red side of the RR Lyrae gap, the reddening probably corresponds to E(B-V) of 0.03, and the HB occurs at a V magnitude of about 17.35. The cluster is shown to be on the other side of the Galactic center from the sun, at a distance of 5.2 kpc and 15 kpc above the plane. An intermediate metal abundance corresponding to an Fe/H abundance ratio of approximately -1.5 is estimated for Palomar 5 along with an absolute magnitude of -5.0, a mass of 13,000 solar masses, and a tidally limited diameter of 225 pc. It is concluded that Palomar 5 must have been formed in the halo at distances more remote than about 15 kpc and that the enrichment history of the halo has not been smooth.
Hartwick David A. F.
Sandage Alan
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