Laboratory Astrophysics Under the Ultraviolet, Visible, and Gravitational Astrophysics Research Program

Details Laboratory Astrophysics Under the Ultraviolet, Visible, and Gravitational Astrophysics Research Program Laboratory Astrophysics Under the Ultraviolet, Visible, and Gravitational Astrophysics Research Program

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999stin...9950979f&link_type=abstract

Technical Report, Toledo Univ. OH United States Dept. of Physics and Astronomy

Astronomy and Astrophysics

Astrophysics

Space Missions, Astrophysics, Ultraviolet Radiation, Far Uv Spectroscopic Explorer, Space Transportation System Flights, Oscillator Strengths, Hubble Space Telescope, Transition Probabilities, Interstellar Matter, Abundance, Astronomy, Atoms

Scientific paper

Space-borne facilities, such as the Hubble Space Telescope, the recent ORFEUS-SPAS II Shuttle mission, and the soon-to-be launched Far Ultraviolet Spectroscopic Explorer, are providing data at ultraviolet wavelengths of unprecedented quality for spectroscopic studies of many astronomical environments. The first step in the analysis of these data involves the derivation of abundances. Obtaining accurate abundances is possible only when the correspondence between line strength and abundance is well known. The conversion of line strength to abundance relies on knowledge of transition probabilities and oscillator strengths, often obtained from mean lives branching fractions. For many ultraviolet transitions, the necessary atomic and molecular data are either relatively imprecise or not available. Our program addresses this need for accurate oscillator strengths; our focus is on transitions that probe the nature and composition of the interstellar medium.

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