Spots and active regions on the emission-line, red dwarf star v 775 her

Quasi-simultaneous photoelectric and spectroscopic observations of the active spotted star V 775 Her have been made for the first time and showed an increase in the equivalent width of the pure emission in the H_a line with a decrease in the star’s brightness. Such an increase was due to an increase in electron density in the active regions and demonstrates a connection between active regions and cool spots. The system’s photometric variability is fully described within the framework of a zonal model. The spotted regions occupy up to 42% of the star’s total surface if the temperature difference between the quiet photosphere and a spot is about 900 K. The ratio of the masses of the components of V 775 Her is estimated for the first time. Translated from Astrofizika, Vol. 43, No. 3, pp. 339-351, July–September, 2000.