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Published online by Cambridge University Press: 12 April 2016
Shcherbakov (1979) first reported that the S star HR 1105 shows a strong and variable He I X10830 line. We confirm this report and present spectra of HR 1105 around 10830 A taken over approximately 0.3 orbit, from a program to obtain full orbital coverage for this 600-day system. Using Griffin's (1984) orbital solution, we have phased in the data presented by Shcherbakov with our own and found that for two coincidences of phase, the 10830 profiles at different epochs but same orbital phases are identical within the limitations of the data. The earlier observations were taken eight orbits (13 years) before ours.