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1998ApJ...509..192S - Astrophys. J., 509, 192-202 (1998/December-2)
Luminosity functions for globular clusters.
SILVESTRI F., VENTURA P., D'ANTONA F. and MAZZITELLI I.
Abstract (from CDS):
In the first analysis we find that, for relatively large metallicities (Z ≥ 10–3) a good fit between theoretical and observed LFs can be found, although a simple χ2 statistical analysis shows that it is not possible to derive a strongly preferred age (or, equivalently, distance modulus) from the LF comparison. The fit with lower metallicity [Z ∼ (1-2)x10–4] LFs is less good but statistically acceptable. The main result is that the difference between observed and theoretical LFs of low-metallicity clusters reported by VandenBerg, Bolte, & Stetson appears to be much reduced in present models, and we give the possible reason why this happens and its consequences for the important parameter of the helium core mass at the flash. In the second application, we explore the effect of varying age and distance modulus on the mass function derived for a globular cluster. Distance moduli corresponding to the ``long'' distance scale (and relatively low ages) seem to be preferred based on these comparisons. The resulting index of the IMF is smaller than with a lower distance modulus, and generally an insignificant amount of mass in brown dwarfs is predicted if the IMF is extrapolated below the hydrogen-burning limit.
Abstract Copyright: ∼
Journal keyword(s): Galaxy: Globular Clusters: General - Stars: Low-Mass, Brown Dwarfs - Stars: Luminosity Function, Mass Function - Stars: Subdwarfs
Simbad objects: 6
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