Raman Scattering In Symbiotic Stars: Ultraviolet and Optical Observations

Physics

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Schmid (Schmid, H.M., 1989, A&A 211, L31) proposed that the long unidentified emission lines in the optical spectra of some symbiotic stars at 6825, 7082Å result from the Raman scattering of the O VI (O^+5) resonance photons at 1032, 1038Å by neutral circumstellar hydrogen. The far ultraviolet (UV) region in which the O VI emissions lie was inaccessible to previous telescopes and so direct observation of these lines was not possible. Several recent UV telescopes carried aboard space shuttle missions were used to examine the spectra of some symbiotic stars for the O VI 1032, 1038Å emissions. Using these data and contemporaneous ground-based opticalobservations, line fluxes and line widths of the O VI emissions were compared to those of the optical 6825, 7082Å emission lines to verify the theoretical predictions of Schmid. Scattering efficiencies were calculated for each object in which the Raman process is observed. We discuss the results in terms of the Schmid Raman scattering hypothesis.

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