Abstract
We present an analysis of NICMOS photometry and low-resolution grism spectroscopy of low-mass stars and substellar objects in the young star-forming region NGC 1333. Our goal is to constrain the ratio of low-mass stars to substellar objects down to 20MJup in the cluster, as well as constrain the cluster initial mass function (IMF) down to 30MJup, incombinationwithaprevioussurveyof NGC1333byWilkingetal.Oursurveycoversfourfieldsof 51.2 00 ; 51.2 00 ,centeredonbrowndwarfcandidatespreviouslyidentifiedinWilkingetal.Weextendpreviousworkbasedonthe useof awatervaporindexforspectraltypingtowavelengthsaccessiblewithNICMOSontheHubbleSpaceTelescope.
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