Spectroscopy of RY Sagittarii during the 1993 minimum
The R Coronae Borealis (RCB) star RY Sgr underwent a deep minimum (Delta(V) approximately 7m5) in 1993. Here medium and low resolution observations from approximately 35 days into the decline are presented together with photometry from the early phases until some 100 days thereafter. The spectra show sharp chromospheric emission lines of Fe, Ti II, Sc II, Ba II and Y II, as well as broad emission from Na D, He I, K and Mg I. In general the braod lines are stationary or slightly blueshifted...[Show more]
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