Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100..156r&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 100, July 1990, p. 156-161.
Astronomy and Astrophysics
Astronomy
4
Astronomical Photometry, Interstellar Extinction, Space Density, Star Distribution, Stellar Spectra, Absorption Spectra, Astronomical Photography, Stellar Luminosity
Scientific paper
Photographic BV photometry and objective-prism spectral classifications of 1911 stars brighter than V = 12.75 have been used to determine the run of interstellar extinction and the field-star space densities in a 12.14 sq degree field centered at (l,b) = (268,0). The extinction rises rapidly to Av = 3.4 between r = 850 and 1600 pc, and remains constant thereafter out to at least 5 kpc. Stellar density variations are essentially independent of spectral type, indicating a density enhancement near r = 400 pc, a deficiency of stars at 800 pc, and a trend toward increasing densities beyond 1 kpc.
Reed Cameron B.
Slawson Robert W.
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