Abstract
Spectroscopic observations of the recurrent Nova CI Aql in the wavelength range 4000–11000 A are presented. Its evolution is traced from maximum light to the disappearance of nebular lines. 〈EB-V〉 = 0.91 ± 0.11, as inferred from the Balmer decrement. The mean expansion velocity of the envelope measured near maximum light is 2800 km s−1. The helium abundance in the Nova envelope has been found to be enhanced, ‹He/H›=0.22. CI Aql is similar in spectral evolution, in change of the envelope expansion velocity, and in helium abundance to other recurrent novae.
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