Variability survey in NGC 6910, the open cluster rich in $\beta$ Cephei-type stars

TL;DR

This study conducted a comprehensive variability survey of NGC 6910, identifying over 100 variable stars, including many $eta$ Cephei-type stars, and analyzed their pulsations through photometry and spectroscopy.

Contribution

It provides the first extensive variability catalog of NGC 6910, revealing a rich population of pulsating and binary stars with detailed spectral line profile changes.

Findings

Over 100 variable stars identified in NGC 6910.

Detected spectral line profile variations in $eta$ Cephei stars.

Confirmed pulsations and binarity as key variability mechanisms.

Abstract

NGC 6910 is the northern hemisphere open cluster known to be rich in $\beta$ Cephei-type stars. Using four-season photometry obtained in Bia\l k\'ow (Poland) and Xinglong (China) observatories, we performed variability survey of NGC 6910. As the result, we found over 100 variable stars in the field of the cluster, including many stars showing variability due to pulsations and binarity. Thanks to the spectroscopic observations, we also detected changes in the profiles of spectral lines of $\beta$ Cep stars, caused by pulsations.