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Differential Line-Shifts

Published online by Cambridge University Press:  12 April 2016

William Buscombe
William Buscombe*
Affiliation:
Northwestern University, Evanston, IL 60201, U.S.A.

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In the beginning of this review, I paraphrase three statements from Paul W. Merrill (1960). (1) In the spectra of long-period variables, absorption lines of neutral metals show a shortward displacement increasing algebraically with excitation potential, probably due to atoms moving outward in the star’s upper atmosphere with an expansion velocity of the order of 20 km s-1. (2) About 6 weeks after maximum light emission components appear within the broad absorption at H and K of Ca II, but displaced about -100 km s-1. A similar, but less extreme, behaviour is known for classical cepheids. (3) In quasi-constant red giants, the resonance lines of Ca II, Ca I, and SR II show circumstellar components displaced shortward relative to the normal stellar photospheric lines by a velocity which is correlated with the spectral type, typically -8 km s-1 for M6 II to -25 km s-1 for class M0 III.

Type
2. Observed Properties of Stellar Turbulence
Information
International Astronomical Union Colloquium , Volume 51: Stellar Turbulence , 1980 , pp. 157 - 162
Copyright
Copyright © Springer-Verlag 1980

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