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2000ApJ...533..215C - Astrophys. J., 533, 215-235 (2000/April-2)
Distances, ages, and epoch of formation of globular clusters.
CARRETTA E., GRATTON R.G., CLEMENTINI G. and FUSI PECCI F.
Abstract (from CDS):
We then compare the corresponding (true) LMC distance modulus µLMC=18.64±0.12 mag with other existing determinations. We conclude that at present the best estimate for the distance of the LMC is µLMC=18.54±0.03±0.06, suggesting that distances from the subdwarf fitting method are ∼1 σ too long. Consequently, our best estimate for the age of the GCs is revised to Age=12.9±2.9 Gyr (95% confidence range). The best relation between ZAHB absolute magnitude and metallicity is MV(ZAHB)=(0.18±0.09)(Fe/H+1.5)+(0.63±0.07). Finally, we compare the ages of the GCs with the cosmic star formation rate recently determined by studies of the Hubble Deep Field (HDF), exploiting the determinations of ΩM=0.3 and ΩΛ=0.7 provided by Type Ia supernovae surveys. We find that the epoch of formation of the GCs (at z∼3) matches well the maximum of the star formation rate for elliptical galaxies in the HDF as determined by Franceschini et al.
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Journal keyword(s): Galaxies: Distances and Redshifts - Galaxy: Globular Clusters: General - Galaxies: Magellanic Clouds - Stars: Evolution
Simbad objects: 78
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