Abstract

In this paper, we study the distribution of main-sequence stars over rotational velocities as a function of effective temperature. Using spectroscopic surveys, and after selecting main-sequence stars and retaining only high-quality data, we obtain a sample of 73,340 GALAH objects, 21,654 APOGEE objects, and 2262 Glebocki objects. For stars in the broad temperature range of 3500–8000 K, we analyse the vsini distributions in narrow 500 K bins, and find that in each bin the distribution follows a power law with the exponent varying systematically with temperature. For solar-type stars, the obtained magnetic braking index q is consistent with the Skumanich law.

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