Other
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...4e..28l&link_type=abstract
The Ultraviolet Universe: Stars from Birth to Death, 26th meeting of the IAU, Joint Discussion 4, 16-17 August 2006, Prague, Cze
Other
Scientific paper
Many symbiotic stars and some young planetary nebulae are known to exhibit very prominent and broad wings around H alpha emission. Lee (2000) proposed that these H alpha wings are formed from Raman scattering by atomic hydrogen of far UV radiation around Ly beta. However, broad wings may also arise from other mechanisms including fast gas flows around the hot star and Thomson scattering. Furthermore, it is unclear whether continuum around Ly beta or Ly beta line photons themselves are responsible for the broad H alpha wings in the proposal of Lee (2000). In order to confirm the Raman scattering origin of H alpha wings, we present our high resolution spectrum around H alpha of the symbiotic star V1016 Cyg and the young planetary nebula IC 5117 obtained with the Bohyunsan Optical Echelle Spectrograph installed on the 1.8m telescope. The two objects show relatively strong Raman scattered He II 6545 features but H alpha wings are significantly weak in IC 5117 compared with those in V1016 Cyg. In the spectra, we note that the H alpha and He II emission lines in IC 5117 are much narrower than the counterparts in V1016 Cyg. Applying Gaussian fits to these emission lines and inferring the far UV radiation compatible with the recombination theory, we perform Monte Carlo simulations of Raman scattered He II 6545 and H alpha wings in an assumed neutral region with H I column density of 10^22 cm^-2. Our numerical results show relatively weak H alpha wings compared with He II 6545 in IC 5117 and quite strong H alpha wings in V 1016 Cyg, which is consistent with our observational spectra. This result strongly indicates that the broad H alpha wings are originated from the Ly beta line photons not continuum photons around Ly beta.
Kang Suna
Lee Hyun Woo
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