The ages and distances of eight globular clusters

Details The ages and distances of eight globular clusters The ages and distances of eight globular clusters

Mar 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apjs...42..481c&link_type=abstract

Astrophysical Journal Supplement Series, vol. 42, Mar. 1980, p. 481-500. Research supported by Harvard University and U.S. Vete

Astronomy and Astrophysics

Astrophysics

83

Chronology, Cosmology, Distance, Globular Clusters, Stellar Evolution, Abundance, Atmospheric Models, Stellar Magnitude, Stellar Spectrophotometry, Stellar Temperature, Subdwarf Stars, Ubv Spectra, Variable Stars

Scientific paper

Deblanketing vector slopes as a function of temperature are derived from photometric and spectrophotometric studies of field subdwarfs and model atmospheres. These vectors are used to transform the UBV data of globular cluster main-sequence mean points to effective temperatures. With the addition of subdwarf bolometric corrections, the clusters' ages and distances are derived by fitting to model isochrones and field subdwarf parallax data. Results show that globular clusters formed over a period of several billion years, with the mean halo metallicity in the solar region increasing slowly with time. It appears that the galactic disk formed about the time halo metallicity reached a nearly solar level, 6 to 8 billion years ago.

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