Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996pasp..108..695h&link_type=abstract
Publications of the Astronomical Society of the Pacific, v.108, p.695
Astronomy and Astrophysics
Astronomy
Galaxy: Stellar Content, Catalogs
Scientific paper
The HST Guide Star Catalog provides magnitudes and positions, and is nearly complete down to fourteenth magnitude for high and intermediate Galactic latitudes. The limitation in types of information is offset in some degree by the size of the Catalog, with 15 million stars. Experiments using the Galactic structure software, "IASG:, show that the IASG models can represent the Catalog very closely with small changes to the IASG old-disk default density and scale height, in clear preference to a single component disk model. The density, scale-height combinations were explored to bracket the region of agreement. An increase of 20% in both the old-disk density normalization to 0.13 and scale height to 0.8 kpc generates star numbers which very closely follow the numbers in the Catalog starcount histograms and are suggested as an optimal fit, although some trade-off between these two parameters can also represent the data well. (SECTION: The Galaxy)
Hershey John L.
Ratnatunga Kavan
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