Cool White Dwarfs from the SuperCOSMOS and Sloan Digital Sky Surveys

N. C. Hambly, A. P. Digby, B. R. Oppenheimer

Research output: Contribution to conferencePaper


We have used datamining techniques in the SuperCOSMOS Science Archive ( to obtain a large, well defined proper motion and magnitude selected sample of cool white dwarfs. Using accurate 5-colour photometry from the Sloan Digital Sky Survey DR1 and SuperCOSMOS Sky Survey photometry and astrometry, we demonstrate the power of reduced proper motion in obtaining a sample of >700 white dwarfs. We examine the characteristics of these objects in various two-colour diagrams in conjunction with new model atmosphere predictions recently computed in the SDSS photometric system. Ultimately, we intend to analyse these data with techniques similar to those already used to examine the subdwarf luminosity function (Digby et al. 2003). In this way, we aim to decompose the contribution of thin disk, thick disk and spheroid white dwarfs in the sample to enable computation of accurate luminosity functions for those respective populations.
Original languageEnglish
Publication statusPublished - 1 Jul 2005


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