Washington CCD Photometry of the Disk Globular Cluster Palomar 8

Details Washington CCD Photometry of the Disk Globular Cluster Palomar 8 Washington CCD Photometry of the Disk Globular Cluster Palomar 8

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.7501b&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #75.01; Bulletin of the American Astronomical Society, Vol. 24, p.1241

Astronomy and Astrophysics

Astronomy

Scientific paper

Washington CCD photometry is presented for Pal 8, a globular cluster traditionally identified with the galactic disk system of globulars. The photometry reaches several magnitudes below the level of the horizontal branch, showing a clear subgiant and giant branch morphology. Color indices for 86 giants yield a mean cluster metallicity of [Fe/H] = -0.80 +/- .32 (standard deviation); previous integrated light spectroscopy yielded a value that falls just inside the metal-rich end of this error bar. The tendency of Washington photometry to yield lower abundances relative to integrated light spectroscopy is investigated for a possible systematic correction. The new result places Pal 8 at the cutoff in metallicity between the metal-poor halo globular system and the metal-rich disk globular system.

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