Photometric variability of 14 PMS stars in the NGC 7000/IC 5070 complex

TL;DR

This study presents new multicolor photometric data of 14 pre-main sequence stars in the NGC 7000/IC 5070 complex, revealing various variability types and identifying a new 2.45-day periodicity in one star.

Contribution

It provides the first long-term multicolor photometric observations of these stars and identifies a previously unknown periodicity in LkH_alpha 189.

Findings

Different types of photometric variability observed

New 2.45-day periodicity detected in LkH_alpha 189

Long-term data helps understand brightness variations

Abstract

New photometric data from CCD multicolour BVRI observations of 14 pre-main sequence stars during the period from 2013 April to 2015 September are presented. The studied objects are located in the field of 'Gulf of Mexico' in the NGC 7000/IC 5070 star-forming complex. The stars from our study exhibit different types of photometric variability in all optical passbands. Using our long-term observations and data published by other authors, we tried to define the reasons for the observed brightness variations. On the basis of our new data previously unknown periodicity in the light curve of the star LkH_alpha 189 (2.45 days) was registered.