Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...254..224s&link_type=abstract
Astronomy and Astrophysics, Vol.254, NO. FEB(I), P. 224, 1992
Astronomy and Astrophysics
Astrophysics
24
Raman Scattering, Symbiotic Stars, Emission Lines, Polarization, Monte Carlo Simulations
Scientific paper
Symbiotic binaries consist of a cool giant and a hot radiation source, which is ionizing a nebula. Recently two emission lines at λ6825 and λ7O82, which are only observed in these systems, have been identified as Raman scattering of O VI λ1O32 and λ1O38 photons by neutral hydrogen. Strong O VI lines are produced in the compact H II region, probably near the ionizing component. The conversion into λλ6825, 7082 photons will occur in the extended atmosphere of the cool giant. Because the scattering geometry in symbiotic stars rotates due to the binary motion, systematic changes in the intensity and polarization of the Raman scattered lines are expected.
In this paper Monte Carlo simulations are presented in order to investigate the flux and polarization properties of the Raman scattered emission lines. Photon paths are calculated for an illuminated atmosphere with scatterings according to the Rayleigh phase matrix and for various scattering and absorption coefficients. Calculated flux and polarization phase curves for symbiotic binaries are given, and diagnostic possibilities of the Raman scattered emission lines explored. The results show that the λλ6825, 7082 emission lines allow a determination of orbital parameters, such as period, inclination and orientation of the orbital plane. Additionally, information on the geometric structure of the nebular O VI region and on absorbing particles in the outer atmosphere of the red giant can be obtained.
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