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Paper: Emission Line Spectrum of BF Cyg
Volume: 448, 16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun
Page: 677
Authors: McKeever, J.; Lutz, J.; Wallerstein, G.; Munari, U.; Siviero, A.
Abstract: BF Cyg is a well-known symbiotic star which has been studied extensively photometrically. However, its unusually rich optical emission line spectrum has not received the detailed attention that some other symbiotic stars have garnered. In summer 2006, BF Cyg started into an unusually high brightening in the optical. We obtained high dispersion spectra over the wavelength range of 3900 to 10000Å with the 3.5-m echelle spectrograph at Apache Point Observatory. BF Cyg has a very rich and complex emission line spectrum, which can be characterized as low excitation. We also discuss the evolution of the lines in our spectra over the six month period of our observations. We note, Fe I in emission, which is a rare circumstance. We also discuss the excitation mechanism which produces the Fe I lines.
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