Results of the photometry of the spotted dM1-2e star EY Draconis

TL;DR

This paper presents photometric observations of the spotted star EY Draconis over two seasons, revealing stable rotation and evidence of long-term spot evolution and brightness variations, including a possible 300-day cycle.

Contribution

It provides detailed photometric data and spot modeling of EY Draconis, highlighting long-term brightness variations and surface activity evolution.

Findings

Stable light curve over 60 rotation periods in the first season

Evidence of spot evolution between observing seasons

Indication of a ~300-day brightness variation cycle

Abstract

We have observed EY Draconis with the 24`` telescope of Konkoly Observatory in Budapest for 64 nights. In the first obse rving season the star produced a stable light curve for more than 60 rotation periods, however, the light curves observe d in the next season and the spot modelling show clear evidence of the evolution of the spotted stellar surface. The chan ges of the maximum brightness level suggests the existence of a longer period of about 300 days, which seems to be confir med by the ROTSE archival data.