First observations of an R Coronae Borealis star with the space telescope imaging spectrograph: RY Sagittarii near maximum light
We describe the far-UV (1140-1740 Å) spectrum of the hydrogen-deficient R Coronae Borealis (RCB) star RY Sgr, obtained near maximum light (pulsational phase ~0.1) by the Space Telescope Imaging Spectrograph (STIS) on Hubble Space Telescope. The far-UV spectrum shows a photospheric continuum rising steeply toward longer wavelengths and two prominent emission features at the shorter wavelengths: C II lambda1335 and Cl I lambda1351 (the latter is radiatively fluoresced by the 10 times stronger C...[Show more]
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