Radius of a star as a function of wavelength

AI Thread Summary
The radius of a star does not vary significantly across different wavelengths, particularly within the 100 nm to 100 micron range, as most radiation originates from the photosphere. Current research, including a paper by Paul Swanson, focuses on radio band measurements but lacks comprehensive comparisons with optical and infrared data. The consensus is that the photospheric size remains relatively constant across these wavelengths. Further studies may be needed to explore any subtle variations that could exist. Understanding these dynamics is crucial for accurate stellar modeling and observations.
natski
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Hi all,

My question is, does the radius of a star vary significantly between different wavelengths? I am particularly interested in the 100 nm to 100 micron range. I found a paper by Paul Swanson on the radio band radius, but so far can find nothing which compares optical and infrared measurements.

Natski
 
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In this wavelength range, most of the radiation comes from the photosphere, which I don't think would vary much in size as a function of wavelength
 

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