Palomar 10 and NGC 6749: A Study in Contrasts

Details Palomar 10 and NGC 6749: A Study in Contrasts Palomar 10 and NGC 6749: A Study in Contrasts

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997pasp..109..920k&link_type=abstract

Publications of the Astronomical Society of the Pacific, v.109, p.920-926

Astronomy and Astrophysics

Astronomy

7

Hii Regions, Galaxies: Individual: M33

Scientific paper

We present new photometry in $V$ and $I$ for Palomar 10 and NGC 6749, two heavily obscured and sparse globular clusters. The color-magnitude diagram (CMD) of Pal 10 exhibits marked differential reddening with a mean reddening $E(B-V) = 1.66 \pm 0.1$. Its CMD has the purely red horizontal branch characteristic of a high-metallicity cluster; we estimate [Fe/H] $\sim -0.1$ on the Zinn-West metallicity scale. NGC 6749 (= Berkeley 42, listed in some other sources as an old open cluster) has a similarly large reddening ($E(B-V) = 1.5 \pm 0.07$) but its CMD is that of a typically metal-poor ([Fe/H] $\sim -1.6$) cluster with a purely blue HB. We estimate their distance moduli as $(m-M)_0$ = 13.85 (d = 5.9 kpc) for Pal 10 and $(m-M)_0$ = 14.45 (7.8 kpc) for NGC 6749. King-model fits to their radial distributions yield very low central concentrations for both: c = 0.58 (Pal 10) and c = 0.83 (NGC 6749. (SECTION: Stellar Clusters and Associations)

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