According to Kippenhahn's diagram, there is a decrease, but it is not clear whether this decrease has the general shape of a negative exponential or a power law or is linear or whatever else. Could the shape be different in function of the star mass, eg. 10 - 30 times the solar mass compared to 1 - 3 times the solar mass ?
Actually, there are indications that the initial collapse only produces relatively small masses (up to about 20 Msol). According to this model the more massive stars are formed at a later stage through mergers or accretion. A brief review can be found here:
http://arxiv.org/pdf/1209.1786v1.pdf
Many thanks for your answer ! I'll read this review document in arxiv to check whether a trend can be deduced for more massive stars and look for future orientations of thinking !
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