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Observational Evidence by Fourier Transform Spectroscopy of Convective Motion in Late-Type Stellar Atmospheres

Published online by Cambridge University Press:  19 July 2016

Jean-Pierre Maillard  and
Daniel Nadeau
Jean-Pierre Maillard
Affiliation:
Institut d'astrophysique de Paris, 98bis Blv. Arago, 75014 Paris, France
Daniel Nadeau
Affiliation:
Département de physique, Université de Montréal, CP 6128A, Montréal, QC, Canada H3C 3J7

Abstract

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We have obtained FTS spectra of 11 stars of spectral types from MO to M4 III in the infrared K band. The shifts at line bottom of the lines of CO and Fe I show a dependence on excitation energy and line depth similar to that caused by convective motions in the photosphere of the Sun but with a larger amplitude. Time variability is small but important differences appear between individual stars of similar types. From these data it should be possible to obtain quantitative estimates of the convective velocities and horizontal temperature inhomogeneities.

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. 249 - 252
Copyright
Copyright © Kluwer 1988 

References

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