Epsilon Aurigae -- Is the Answer Blowin' in the Wind?

Astronomical Society of the Pacific Conference Series(2006)

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摘要
We report on a FUSE observation of the enigmatic eclipsing binary, epsilon Aurigae. This system undergoes a two year long eclipse every 27.1 years, presumably as a large, nearly edge-on disk passes in front of the F0 Ia primary star. We obtained FUSE data shortly after the predicted emergence of the secondary object from behind the primary star. The spectrum is heavily obscured by H-2 and interstellar absorption, consistent with the system reddening. Nonetheless epsilon Aur shows a rich emission line spectrum due to low lying lines, such as Fe II, down to 1040 angstrom. We discuss a model where the emission is due to resonance scattering of photons in the expanding wind of the supergiant or disk from an occulted hot source.
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spectrum,emission line
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