Effects of Collisional De-Excitation on the Resonance Doublet Flux Ratios in Symbiotic Stars and Planetary Nebulae

Mathematics – Probability

Scientific paper

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Line: Formation, Radiative Transfer, Binary:Symbiotic, Scattering, Ultraviolet: Ism

Scientific paper

Resonance doublets including O VI 1032, 1038, NV 1239, 1243 and C IV 1548, 1551 constitute prominent emission lines in symbiotic stars and planetary nebulae. Spectroscopic studies of symbiotic stars and planetary nebulae from UV space telescopes show various line ratios of these doublets deviating from the theoretical ratio of 2:1. Using a Monte Carlo technique, we investigate the collisional de-excitation effect in these emission nebulae. We consider an emission nebula around the hot component of a symbiotic star characterized by the collisional de-excitation probability p_{coll} ˜ 10^{-3} - 10^{-4} per each resonance scattering, and the line center optical depths for major resonance doublets in the range τ_0˜ 10^2-10^5. We find that various line ratios are obtained when the product p_{coll}τ_0 is of order unity. Our Monte Carlo calculations show that the flux ratio can be approximately fitted by a linear function of log τ_0 when τ_0p_{coll}˜ 1. It is briefly discussed that this corresponds to the range relevant to the emission nebulae of symbiotic stars.

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