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Variations in the Line Spectrum of A-Type Supergiants
Published online by Cambridge University Press: 07 February 2017
Abstract
Attention is drawn to a group of stars of luminosity class Ia, in which variation of radial velocity has long been known in semi-regular cycles of 5 to 30 days. The interval of approximate repetition appears to be positively correlated with the luminosity of the star.
Recent spectrophotometry of the absorption lines, especially by Rosendhal, Aydin, Groth, and Buscombe shows a considerable variation in the strength of Balmer lines (with emission components detected at H∝), as well as those of metallic ions. The microturbulence parameter derived from curves of growth for Fe ii varies by a factor of two or more during some cycles.
- Type
- Part III Large Mass Stars, Stability in Supergiants, Critical Masses
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- Copyright © Reidel 1974