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High Time Resolution Spectroscopic Observations of Stellar Shock Waves

Published online by Cambridge University Press:  19 July 2016

P. L. Cottrell ,
W. A. Lawson  and
S. M. Smith
P. L. Cottrell
Affiliation:
Mount John University Observatory, Department of Physics, University of Canterbury, New Zealand
W. A. Lawson
Affiliation:
Mount John University Observatory, Department of Physics, University of Canterbury, New Zealand
S. M. Smith
Affiliation:
Mount John University Observatory, Department of Physics, University of Canterbury, New Zealand

Abstract

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An absorption line–splitting phenomenon, first reported by Cottrell and Lambert (1982a), has been shown to occur at about maximum light in the semi-regular pulsations of the R Coronae Borealis (RCB) star, RY Sgr (Lawson 1986). This has been interpreted as a shock wave propagating through the photospheric layers (Lawson and Cottrell 1986). We present spectroscopic observations of this star, taken to coincide with this line–splitting event. A sequence obtained during 1986 October revealed that this event extended over about 6 days (out of a period of about 40 days) and began at about the bluest B-V. This colour maximum, which corresponds to maximum photospheric temperatures and minimum radius, leads the V maximum by about 6 days.

Type
IV. Spectroscopic Patterns of Stellar Atmospheres
Information
Symposium - International Astronomical Union , Volume 132: The Impact of Veryhigh S/N Spectroscopy on Stellar Physics , 1988 , pp. 205 - 208
Copyright
Copyright © Kluwer 1988 

References

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