Long-term $V(RI)_{c}$ CCD photometry of pre-main-sequence stars in the association Cepheus OB3

TL;DR

This study provides the first long-term optical CCD photometry of 13 pre-main-sequence stars in Cepheus OB3, revealing significant variability over 13 years, and fills a gap in the literature regarding their long-term behavior.

Contribution

It introduces the first extensive 13-year $V(RI)_{c}$ photometric monitoring of PMS stars in Cepheus OB3, highlighting their variability and contributing valuable long-term observational data.

Findings

All stars show strong photometric variability.

Long-term data covers 13 years of observations.

Fills a gap in literature on PMS star variability.

Abstract

Results from optical CCD photometric observations of 13 pre-main-sequence stars collected during the period from February 2007 to November 2020 are presented. These stars are located in the association Cepheus OB3, in the field of the young star V733 Cephei. Photometric observations, especially concerning the long-term variability of the stars, are missing in the literature. We present the first long-term $V(RI)_{c}$ monitoring for them, that cover 13 years. Results from our study indicate that all of the investigated stars manifest strong photometric variability. The presented paper is a part of our program for the photometric study of PMS stars located in active star-forming regions.