Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-08-31
Astronomy and Astrophysics
Astrophysics
7 pages, 8 tables, accepted for publication in the Astrophysical Journal
Scientific paper
10.1086/308275
Using a new grid of models of cooling white dwarfs, we calculate isochrones and luminosity functions in the Johnson-Kron/Cousins and HST filter sets for systems containing old white dwarfs. These new models incorporate a non-grey atmosphere which is necessary to properly describe the effects of molecular opacity at the cool temperatures of old white dwarfs. The various functions calculated and extensively tabulated and plotted are meant to be as utilitarian as possible for observers so all results are listed in quantities that observers will obtain. The tables and plots developed should eventually prove critical in interpreting the results of HST's Advanced Camera observations of the oldest white dwarfs in nearby globular clusters, in understanding the results of searches for old white dwarfs in the Galactic halo, and in determining ages for star clusters of all ages using white dwarfs. As a practical application we demonstrate the use of these results by deriving the white dwarf cooling age of the old Galactic cluster M67.
Chieffi Alessandro
Fahlman Gregory G.
Hansen Brad
Limongi Marco
Richer Harvey B.
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