Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979colo.rept.....s&link_type=abstract
Final Report Colorado Univ., Boulder. Lab. for Atmospheric and Space Physics.
Astronomy and Astrophysics
Astronomy
Oao 3, Stellar Spectrophotometry, Ultraviolet Astronomy, Ultraviolet Spectrophotometers, Interstellar Gas, Interstellar Matter, Line Spectra, Planetary Nebulae, Stellar Envelopes, Stellar Mass, Stellar Winds
Scientific paper
Ultraviolet spectral data from the OAO 3 satellite are being used to study interstellar absorption lines and stellar and circumstellar lines in hot stars. The interstellar data are beneficial in analyzing the depletions of heavy elements from the gas phase and in elucidating how these depletions depend on physical conditions. Abundances in separate velocity components were determined from line profiles. Observations were carried out for interstellar abundances, both atomic and molecular, towards a number of stars. The better quality data are being analyzed for profile information and the lesser data are being used in curve-of-growth analyses. Molecular observations were carried out as well, N2 was sought; interstellar C2 was detected and its rotational excitation utilized to establish limits in interstellar cloud temperatures. An extensive search for H2O resulted in a tentative identification which will produce new information on chemical reaction rates. Interstellar depletions and grain properties in the rho Ophiuchi cloud, stellar wind variability, and circumstellar lines are also under study.
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