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Issue A&A Volume 373, Number 3, July III 2001 Page(s) 895 - 898 Section Galactic structure and dynamics DOI 10.1051/0004-6361:20010655

A&A 373, 895-898 (2001)
DOI: 10.1051/0004-6361:20010655

Analysis of RGU photometry in selected Area 141

Y. Karatas¹, S. Karaali¹ and R. Buser<sup>2

1</sup>  Istanbul University Science Faculty, Department of Astronomy and Space Sciences, 34452 University-Istanbul, Turkey
²  Astronomisches Institut der Universität Basel, Venusstr. 7, 4102 Binningen, Switzerland

(Received 19 March 2001 / Accepted 2 May 2001)

Abstract
The South Galactic pole field SA141 is investigated by using the full calibration tools of RGU photometry. The observed RGU data are reduced to the standard system, and the separation of dwarfs and evolved stars is carried out by an empirical method. Stars are categorized into different metallicity classes and their absolute magnitutes are determined by the corresponding colour-magnitude diagrams. 9 extra-galactic objects have been eliminated from the present stellar statistical treatment. The local luminosity function agrees with the Gliese (1969) and the partly with the Hipparcos (Jahreiss & Wielen 1997) luminosity function. At the brighter luminosity intervals, the low value of the present observed luminosity function is most probably due to the larger uncertainty in the absolute magnitude determination implied by stars near the main-sequence turnoff. For giants, we found an upper limit, D^*(0) = 6.80, of logarithmic local space density close to the one of Gliese & Jahreiss (1992), i.e.: .

Key words: Galaxy: structure -- stars: luminosity function

Offprint request: Y. Karatas, karatas@istanbul.edu.tr

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© ESO 2001

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