Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...19312305s&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #123.05; Bulletin of the American Astronomical Society, Vol. 31, p.667
Astronomy and Astrophysics
Astronomy
Scientific paper
As a part of the Selected Areas Starcounts Survey (SASSY), we present an analysis of the density laws of the Galactic populations. Using broadband RI photometry, which is relatively insensitive to the effects of differential metallicity and reddenning, combined with a revision of the M(R) to R-I relation calibrated from HIPPARCOS data, we have derived photometric parallaxes for a sample of 46,000 stars in 9.7 square degrees in the Selected Areas 107 (l,b=6,41), 184 (l,b=356,-40), 90 (l,b=77,-33) and 141 (l,b=245,-86). The data are 100 to an average magnitude of I=19.8 and R=20.6 across all fields. We discuss the methods used for photometry and object classification. We also demonstrate how Malmquist bias, binary stars and poor star/galaxy separation can affect the density laws derived in starcount analyses. Our exponential scaleheights and density normalizations for the CCD data in SA141 agree well with the previous photographic work in this field by Gilmore & Reid (1983), as well as the previously reported parameters of the ``interim starcount model'' in Reid & Majewski (1993). However, global solutions to all four fields found unsatisfactory fits to the radial dependences of the densities when exponential functional forms were used, which suggests that more complex density laws may be required.
Majewski Steven R.
Reid Iain Neill
Siegel Michael Hiram
Thompson Ian
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