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We report accurate measurements of the physical properties (mass, radius,temperature) of components of the G+M eclipsing binary V530 Ori. The M-typesecondary shows a larger radius and a cooler temperature than predicted bystandard stellar evolution models, as has been found for many other low-massstars and ascribed to the effects of magnetic activity and/or spots. We showthat models from the Dartmouth series that incorporate magnetic fields are ableto match the observations with plausible field strengths of 1-2 kG, consistentwith a rough estimate we derive for that star.

The Benchmark Eclipsing Binary V530 Ori: A Critical Test of Magnetic Evolution Models for Low-Mass Stars