* Astronomy

Title: PZ Mon is a new RS CVn synchronous binary giant with low mass ratio
Author: Y. V. Pakhomov, N. A. Gorynya

Analysis of new radial velocity measurements of the active giant PZ Mon is presented. We estimated the radial velocity of center of mass 25.5±0.3 km s^-1, the period on the circular orbit P=34.14±0.02 days, and parameters of the secondary component including the mass M₂=0.14 solar masses which is a smallest among known components of RS CVn type giants. Combined with photometric data we conclude that PZ Mon is a system with synchronous rotation, and there is a big cool spotted area on PZ Mon surface towards to secondary component that provides optical variability.

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