A High Dispersion Spectral Study of RY Sagittarii

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Abstract
A differential curve of growth analysis comparing RY Sgr with the Go Ib supergiant B Aqr showed that the former star has the atmospheric characteristics of a supergiant star hotter than the Sun. The carbon-to-hydrogen ratio was found to be 25 : 1, and the carbon-to-iron 35 times normal. Other elements which appear to be anomalously high are sodium and lithium. In most respects RY Sgr is very similar to R CrB and the continuous opacity source is probably the same for both–photoionization of neutral carbon. The assumption of a normal iron abundance together with spectroscopic evidence supports the view that RY Sgr is a helium star. Conflicting evidence gives doubt to a reliable mass determination.

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