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Fe I Line Asymmetries and Shifts Caused by Pressure Broadening

Published online by Cambridge University Press:  12 April 2016

V. Kršljanin ,
I. Vince  and
S. Erkapić
V. Kršljanin
Affiliation:
Astronomical Observatory, Volgina 7, 11050 Belgrade, Yugoslavia
I. Vince
Affiliation:
Astronomical Observatory, Volgina 7, 11050 Belgrade, Yugoslavia
S. Erkapić
Affiliation:
Astronomical Observatory, Volgina 7, 11050 Belgrade, Yugoslavia

Abstract

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In order to test the validity of the usual neglect of pressure line shifts in investigations of Fe I line asymmetries and shifts, we calculated synthetic line bisectors and shifts of 96 moderate and weak photospheric lines, taking into account both hydrogen- and electron-impact shifts and neglecting the velocity fields. Absolute pressure line shifts obtained are less than or appr. equal to 50 m/s and the largest relative shifts along the bisectors are about 40 m/s. We found pronounced dependences of both shifts and bisectors on the energy of the upper level in transitions and on the transition array.

Type
Part III Solar magnetism and large-scale flows
Information
International Astronomical Union Colloquium , Volume 130: The Sun and Cool Stars: activity, magnetism, dynamos , 1991 , pp. 277 - 278
Copyright
Copyright © Springer-Verlag 1991

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