Astronomy and Astrophysics – Astrophysics
Scientific paper
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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