On the interpretation of oxygen line emission in comets and in SN 1987A

Details On the interpretation of oxygen line emission in comets and in SN 1987A On the interpretation of oxygen line emission in comets and in SN 1987A

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.272..311k&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 272, Issue 2, pp. 311-316.

Astronomy and Astrophysics

Astronomy

2

Atomic Processes-Line, Formation-Comets, General-Supernovae, General-Infrared, General-Ultraviolet, General.

Scientific paper

Present interpretations of neutral oxygen spectra in various astrophysical sources often invoke the H Ly beta/O I fluorescent process to explain the presence of lines originating in higher levels. An analysis of the cascade populations and emissions to be expected from the process is carried out on the basis of a four-term/configuration model which incorporates optical thickness, and is applied to an ultraviolet spectrum of Comet Austin and to near-infrared spectra of the supernova SN 1987A, in which lines are present that have been interpreted as fluorescent oxygen lines. The results imply that the fluorescent mechanism was not present in Comet Austin, nor in other comets, and that it has also not operated in SN 1987A. For Comet Austin in particular this raises further questions concerning the origin of the observed high-excitation lines in the vicinity of 1042 and 1128 A. In the case of SN 1987A, the apparent presence of lines of the O I quintet system, with concurrent absence of the triplet system lines, appears to suggest a selective excitation mechanism.

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