Deep CCD photometry of the globular cluster NGC 7099

Details Deep CCD photometry of the globular cluster NGC 7099 Deep CCD photometry of the globular cluster NGC 7099

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...319..760b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 319, Aug. 15, 1987, p. 760-771.

Astronomy and Astrophysics

Astrophysics

55

Binary Stars, Charge Coupled Devices, Globular Clusters, Main Sequence Stars, Stellar Spectrophotometry, Ubv Spectra, Abundance, Color-Magnitude Diagram, Interstellar Extinction, Stellar Evolution, Stellar Models, Subdwarf Stars

Scientific paper

B and V photometry to V ≡ 24 mag of stars in the globular cluster NGC 7099 has been obtained with the CTIO 4 m CCD prime-focus camera. The color-magnitude diagram obtained shows very well defined, narrow cluster sequences with no blue straggler candidates and no indication of a binary star sequence lying above and to the right of the main sequence. Fitting the NGC 7099 main sequence to a Population II main sequence defined by local subdwarfs, the author derives a distance modulus to the cluster of (m-M)V = 14.65. The best fit to model isochrones is for models with enhanced oxygen abundance and an age near 17 Gyr.

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