Photometric and spectroscopic study of 5 pre-main sequence stars in the vicinity of NGC 7129

TL;DR

This study provides long-term photometric and spectroscopic data on five pre-main sequence stars near NGC 7129, revealing their classical T Tauri nature and significant variability without periodicity.

Contribution

It offers the first extensive multi-year optical photometric and spectroscopic analysis of these five pre-main sequence stars, characterizing their variability and spectral features.

Findings

All stars show strong optical variability.

Stars classified as classical T Tauri with emission lines.

No reliable periodicity detected in brightness variations.

Abstract

We present results from long-term optical photometric and spectroscopic observations of 5 pre-main sequence stars, located in the vicinity of the bight nebula NGC 7129. We obtained UBVRI photometric observations in the field centered on the star V391 Cep, north-west of the bright nebula NGC 7129. Our multicolor CCD observations spanned the period from February 1998 to November 2016. At the time of our photometric monitoring, a total of thirteen medium-resolution optical spectra of the stars were obtained. The results from our photometric study show that all stars exhibit strong variability in all optical passbands. Long-term light curves of the five stars indicate the typical of classical T Tauri stars variations in brightness with large amplitudes. We did not find any reliable periodicity in the brightness variations of all five stars. The results from spectral observations showed that all studied stars can be classified as a classical T Tauri stars with reach emission line spectra and strong variability in the profiles and intensity of emission lines.