Long-term photometric behavior of the PMS stars V977 Cep and V982 Cep in the vicinity of NGC 7129

TL;DR

This study presents long-term BVRI photometric observations of PMS stars V977 Cep and V982 Cep near NGC 7129, revealing strong variability and a new periodicity in V977 Cep, contributing to understanding their behavior.

Contribution

First long-term photometric study of V977 Cep and V982 Cep, identifying new periodicity in V977 Cep and analyzing variability causes.

Findings

Both stars show strong optical variability.

V977 Cep exhibits a previously unknown periodicity.

Data enhances understanding of PMS star brightness variations.

Abstract

Long-term BVRI photometric light curves of the pre-main sequence stars V977 Cep and V982 Cep during the period from 2000 October to 2016 August are presented. The stars are located in the vicinity of the reflection nebula NGC 7129. Our photometric data show that both stars exhibit strong photometric variability in all optical passbands, which is typical for Classical T Tauri stars. Using our observational data we analyze the reasons for the observed brightness variations. In the case of V977 Cep we identify previously unknown periodicity in its light curve.