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The Metallicity Dependence of the Stellar Luminosity and Initial Mass Functions: HST Observations of Open and Globular Clusters | | Ted von Hippel
; Gerard Gilmore
; Nial Tanvir
; David Robinson
; Derek H.P. Jones
; | | Date: |
3 May 1996 | | Subject: | astro-ph | | Affiliation: | University of Wisconsin), Gerard Gilmore, Nial Tanvir, David Robinson (Institute of Astronomy, Cambridge), Derek H.P. Jones (Royal Greenwich Observatory | | Abstract: | Using HST and the WFPC2 we have acquired very deep V- and I-band photometry of stars in NGC 2420 and NGC 2477 to study cluster luminosity functions at approximately solar metallicity. We have determined these cluster luminosity functions down to $M_I$ = 10.5 (0.2 M$_{odot}$) and find that the luminosity function of NGC 2420 turns over at $M_I$ $approx$ 9.0, and possibly stops altogether by $M_I$ $approx$ 9.5. The luminosity function of NGC 2477 may flatten at $M_I$ $geq$ 9.5. We compare our open cluster luminosity functions to the solar neighborhood field star luminosity function of Kroupa, Tout Gilmore (1993) and the four published HST globular cluster luminosity functions: $omega$ Cen (Elson {it et al.} 1995), 47 Tuc (De Marchi Paresce 1995b), M 15 (De Marchi Paresce 1995a), and NGC 6397 (Paresce, De Marchi Romaniello 1995). We find a smooth relation between the location of the luminosity function turn-over and the metallicity for all these low mass star samples which matches the expected $M_I$ versus [Fe/H] trend for a model star of $approx$ 0.27 M$_{odot}$ (Saumon 1995; Alexander {it et al.} 1996). We interpret this smooth and systematic behavior in the cluster luminosity functions as strong evidence in favor of an invariant initial mass function and a metallicity-dependent mass-luminosity relation. | | Source: | arXiv, astro-ph/9605008 | | Services: | Forum | Review | PDF | Favorites | |
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