New four-color optical photometry of the young stars V521 Cyg and FHO 27

TL;DR

This study presents new BVRI photometric data of the young variable stars V521 Cyg and FHO 27, revealing ongoing strong variability and identifying a periodicity of 893 days for FHO 27.

Contribution

First detailed multi-year photometric analysis of V521 Cyg and FHO 27, including the identification of a long-term period for FHO 27.

Findings

V521 Cyg shows continued strong variability and fading events.

FHO 27 exhibits a significant 893-day periodicity.

Stars are confirmed as highly variable pre-main sequence objects.

Abstract

Results from new BVRI photometric observations of the pre-MS stars V521 Cyg and FHO 27 collected during the period from February 2015 to July 2019 are presented. These stars are embedded in the LDN 935, dubbed "The Gulf of Mexico" in the active star-forming complex NGC 7000/IC 5070. Previous studies revealed them as variables with large amplitude brightness variations. Our new observations show that the stars continue to exhibit strong photometric variability and fading events in the brightness. On the basis of the new data received and the data available in the literature, we were able to specify the periodicity in the brightness variations of V521 Cyg. In the case of FHO 27, we found a significant peak in its periodogram corresponding to 893 days period.