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Star counts and galactic structureStar counts are discussed as an aid in studies of galactic structure. Iterative computations using a method-of-color-bins to match numerical models with observational data are described. The star counts provide bounds for the luminosity function and the color-magnitude diagram and allow spheroid normalization in a copycat Galaxy model which posits a galaxy with a Population I disk and a Population II spheroid. Good agreement has been obtained between star counts predicted by the model and observed distributions, including color and magnitude ranges and direction. Modifications being considered for the model include consideration of the halo, a galactic bulge and a thick disk. Several galactic structural features which have yet to be modeled and which may be tractable to the copycat model corrected with star counts are identified.
Document ID
19870039471
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Bahcall, John N.
(Institute for Advanced Study Princeton, NJ, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1986
Subject Category
Astrophysics
Accession Number
87A26745
Funding Number(s)
CONTRACT_GRANT: NAS8-32902
CONTRACT_GRANT: NSF PHY-82-17352
Distribution Limits
Public
Copyright
Other

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