Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apjs...93..211d&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 93, no. 1, p. 211-228
Astronomy and Astrophysics
Astronomy
224
Absorption Spectra, Astronomical Spectroscopy, H I Regions, Interstellar Gas, Lyman Alpha Radiation, Lyman Spectra, Ultraviolet Astronomy, Background Radiation, Gas Density, Hot Stars, Iue
Scientific paper
We measure Galactic interstellar neutral hydrogen column densities by analyzing archival interstellar Ly alpha absorption line data toward 554 B2 and hotter stars observed at high resolution with the IUE satellite. This study more than doubles the number of lines of sight with measures of N(H I) based on Ly alpha. We have included the scattered light background correction algorithm of Bianchi and Bohlin in our data reduction. We use the correlation between the Balmer discontinuity (c1) index and the stellar Ly alpha absorption in order to assess the effects of stellar Ly alpha contamination. Approximately 40% of the B stars with measured (c1) index, exhibit serious stellar Ly alpha contamination. One table contains the derived values of the interstellar N(H I) for 393 stars with at most small amounts of stellar contamination. Another lists the observed values of total N(H I) for 161 stars with suspected stellar Ly alpha contamination and/or uncertain stellar parameters.
Diplas Athanassios
Savage Blair. D.
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