Detection of a Raman Scattered He II Line in the Optical Spectrum of the Symbiotic Star V1016 Cyg

Details Detection of a Raman Scattered He II Line in the Optical Spectrum of the Symbiotic Star V1016 Cyg Detection of a Raman Scattered He II Line in the Optical Spectrum of the Symbiotic Star V1016 Cyg

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...202.3203b&link_type=abstract

American Astronomical Society Meeting 202, #32.03; Bulletin of the American Astronomical Society, Vol. 35, p.743

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Roughly half of all symbiotic stars exhibit two, strong broad Raman scattered emission lines at λ λ 6825 and 7082. These lines result from the inelastic scattering of O VI photons λ λ 1032 and 1038, respectively, on the ground state of neutral hydrogen. With the exception of a single planetary nebula, NGC 7027, Raman scattering has been observed only in the spectra of symbiotic stars. The young planetary nebula NGC 7027, which has two white dwarf central stars and has often been discussed as a possible post-symbiotic star, and the symbiotic star RR Tel each exhibit a broad, but weak emission feature blueward of Hα at λ 4850. This feature has been identified as a Raman scattered He II line produced by the scattering of He II photons of wavelength λ 972 the ground state of neutral hydrogen. We present evidence for a Raman scattered He II feature at λ 4850 in the spectrum of the symbiotic star V1016 Cyg. The scattering efficiency is calculated based on the observed strength of the He II λ 4686 line which is easily related to the strength of the far-UV He II line at λ 972.

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