Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..404..334k&link_type=abstract
The Eighth Pacific Rim Conference on Stellar Astrophysics: A Tribute to Kam-Ching Leung ASP Conference Series, Vol. 404, proceed
Astronomy and Astrophysics
Astrophysics
Scientific paper
Arising from S1/2-P3/2, P1/2 transitions, the resonance doublet lines such as O VI 1032, 1038 and C IV 1548, 1551 are generated with the fixed ratio of 2:1, which is inconsistent with spectroscopic studies of many symbiotic stars from UV space telescopes. For an emission nebula with a size R˜ 1012cm and an electron number density n_e˜ 1010cm-3, the collisional de-excitation time scale is t_C˜ 10-3s and line center optical depths for major resonance doublets are of order τ_0˜ 10^5, from which the probability pcoll of collisional de-excitation per scattering is ˜ 10-5. Using a Monte Carlo technique, we investigate the collisional de-excitation effect and find that various line ratios are obtained in media with the product pcollτ_0 of order unity. We provide a fit to the flux ratios using a linear function of pcolllog τ_0 when τ_0pcoll˜ 1.
Kang Eun-Ha
Lee Hyun Woo
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