An absorption line-splitting phenomenon has been shown to occur at about maximum light in the semi-regular pulsations of the R Coronae Borealis star, RY Sgr (Lawson 1986). This has been interpreted as a shock wave propagating through the photospheric layers (Lawson and Cottrell, 1986). The authors present spectroscopic observations of this star, taken to coincide with this line-splitting event.
The Impact of Very High S/N Spectroscopy on Stellar Physics
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