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Titolo:
Isochrones and luminosity functions for old white dwarfs
Autore:
Richer, HB; Hansen, B; Limongi, M; Chieffi, A; Straniero, O; Fahlman, GG;
Indirizzi:
Osservatorio Astron Roma, I-00040 Monte Porzio Catone, Italy Osservatorio Astron Roma Monte Porzio Catone Italy I-00040 Catone, Italy
Titolo Testata:
ASTROPHYSICAL JOURNAL
fascicolo: 1, volume: 529, anno: 2000,
parte:, 1
pagine: 318 - 337
SICI:
0004-637X(20000120)529:1<318:IALFFO>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUBBLE-SPACE-TELESCOPE; BARYONIC DARK-MATTER; GLOBULAR-CLUSTER; MAGELLANIC-CLOUD; HALO; CALIBRATION; STELLAR; AGE; M4;
Keywords:
galaxy : globular clusters : general; stars : evolution; stars : interiors; stars : luminosity function, mass function; stars : white dwarfs;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Richer, HB Osservatorio Astron Roma, Via Frascati 33, I-00040 Monte PorzioCatone, Italy Osservatorio Astron Roma Via Frascati 33 Monte Porzio Catone Italy I-00040
Citazione:
H.B. Richer et al., "Isochrones and luminosity functions for old white dwarfs", ASTROPHYS J, 529(1), 2000, pp. 318-337

Abstract

Using a new grid of models of cooling white dwarfs, we calculate isochrones and luminosity functions in the Johnson-Kron/Cousins and Hubble Space Telescope (HST) filter sets for systems containing old white dwarfs. These newmodels incorporate a nongray atmosphere that is necessary to properly describe the effects of molecular opacity at the cool temperatures of old whitedwarfs. 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 ofHST'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 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.

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Documento generato il 04/12/20 alle ore 13:10:51