All stars lose mass, in part in the form of a stellar wind. (Even our sun does so, which most known for the beautiful aurora that can be seen) How strong these winds are is not known very well. Measurements are affected by uncertainties such as how smooth or how clumped such winds are. Mathieu Renzo undertook a very careful study to investigate how the various prescriptions for stellar winds and their uncertainties affect the final mass and structure of stars. His paper is accepted for publication and can be obtained here.
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