On Pressure Shifts of FeI Lines in Stellar Atmospheres

Kršljanin, V.

doi:10.1007/978-94-009-0911-3_13

Cited by 5 publications

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“…Pressure broadening produces small (Vince et al, 1985b), but some cases observable (Vince and Dimitrijevic, 1989) line asymmetries and shifts of Nal lines. It was shown recently (Krsljanin, 1989) that some solar Fe I lines also exhibit measurable pressure broadening effects. Estimates of Fe I lines hydrogen-impact shifts (Gomez et al, 1987) appear to be insufficient to determine overall pressure shifts, since collisions with electrically charged particles can produce line shifts of the same order of magnitude as collisions with hydrogen atoms do (Vince et al, 1985a,b).…”

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confidence: 96%

Fe I Line Asymmetries and Shifts Caused by Pressure Broadening

Kršljanin¹,

Vince²,

Erkapić³

1991

International Astronomical Union Colloquium

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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.

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confidence: 96%