# Cool spots on the surface of the active giant PZ Mon

## TL;DR

This study used multiband photometry to model the surface spots of the active giant PZ Mon, revealing temperature differences and spot distribution influenced by a secondary component.

## Contribution

First multiband photometric analysis of PZ Mon's surface spots providing detailed temperature and distribution characteristics.

## Key findings

- Spotted surface temperature: 4730 K
- Cool spots cover about 41% of the surface
- Warm spots have up to 20% area and are distributed at various longitudes

## Abstract

Based on the multiband (BVRIJHKL) photometric observations of the active red giant PZ Mon performed for the first time in the winter season of 2017-2018, we have determined the main characteristics of the spotted stellar surface in a parametric three-spot model. The unspotted surface temperature is Teff=4730 K, the temperature of the cool spots is Tspot=3500 K, their relative area is about 41%, and the temperature of the warm spots is Twarm=4500 K with a maximum relative area up to 20%. The distribution of spots over the stellar surface has been modeled. The warm spots have been found to be distributed at various longitudes in the hemisphere on the side of the secondary component and are most likely a result of its influence.