A color-magnitude diagram for the halo globular cluster M55

Details A color-magnitude diagram for the halo globular cluster M55 A color-magnitude diagram for the halo globular cluster M55

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....96.1632s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 96, Nov. 1988, p. 1632-1641. NSERC-supported research.

Astronomy and Astrophysics

Astronomy

15

Color-Magnitude Diagram, Globular Clusters, Stellar Spectrophotometry, Abundance, Charge Coupled Devices, Giant Stars, Main Sequence Stars, Metallicity, Stellar Magnitude

Scientific paper

The authors present new CCD photometry for the globular cluster M55 that extends well below the main-sequence turnoff. Combining these new data with previously published photographic photometry of cluster giants and horizontal-branch stars yields a high-quality composite color-magnitude diagram (CMD). A comparison of the latter with recent CMDs for M68 and NGC 6752 - two clusters whose metallicities bracket that of M55 - suggests (1) that the reddening to M55 may be as high as E(B-V) = 0.14 mag, and (2) that all three systems have similar ages. In particular, if the apparent distance modulus to M55 is (m-M)V = 14.10 mag, then isochrones for Y = 0.24 and high [O/Fe] would suggest an age of ≡14 Gyr. Very encouraging agreement of the observations with theoretical predictions is found.

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