Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...414..254t&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 414, no. 1, p. 254-278.
Astronomy and Astrophysics
Astronomy
46
Astronomical Photometry, Brown Dwarf Stars, Photographic Plates, Stellar Luminosity, Stellar Mass, Astronomical Catalogs, Milky Way Galaxy, Sky Surveys (Astronomy), Stellar Magnitude
Scientific paper
We describe the construction of a photometric catalog from scans of IIIaF and IVN plate material in 11 fields of the UKSRC and POSSII surveys. The procedures used and quality checks applied are described in detail, and should be considered as illustrative for those planning scientific programs with the forthcoming scans of these surveys. We find our plate material is complete to I of about 18 and R of about 20.5 with photometric uncertainties of +/- 0.20 and +/- 0.25 magnitudes (respectively) at those limits. These data are used to construct luminosity functions for stars within 150 pc of the sun in four distinct directions. We find no significant evidence for variations in the form of the luminosity function in different locations within the Galactic disk. Approximately 10-20 percent variations are seen in the normalization of the luminosity function.
Mould Jeremy R.
Reid Iain Neill
Tinney Chris G.
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