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| Paper: |
Convective Lineshifts in the Solar Spectrum |
| Volume: |
154, Cool Stars, Stellar Systems and the Sun: Tenth Cambridge Workshop |
| Page: |
1594 |
| Authors: |
Hamilton, Devon; Lester, J. B. |
| Abstract: |
The presence of convective motions in the photospheres of the Sun and solar-type stars has traditionally been studied using spectral line asymmetries observed with very high spectral resolution and signal-to-noise. We present an alternative diagnostic based on precision line positions that can be applied using lower spectral resolution and in the presence of some rotational broadening. From a survey of over 700 Fe 1 lines between 0.4 and 5 microns in the solar flux spectrum, we show that line shifts capture the information present in line asymmetries. By studying the variation of lineshifts with wavelength region, with line strength, and with excitation level, we gain a glimpse of the convective motions at different levels in the solar atmosphere. This work is being extended to include different levels of ionization, different elements, molecular species, and stars other than the Sun. |
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