Photometry and spectroscopy of a deep Algol-like minimum of WW Vul in 2016

TL;DR

This study analyzes photometric and spectroscopic data of WW Vul during a deep minimum, revealing circumstellar absorption effects and changes in H-alpha emission consistent with circumstellar material dynamics.

Contribution

It provides detailed spectroscopic analysis of a deep minimum in WW Vul, highlighting circumstellar absorption and emission line variations for the first time.

Findings

Substantial reddening due to circumstellar material.

H-alpha emission decreased by ~30% during the minimum.

Spectral type remained consistent as A3V.

Abstract

We report analysis of photometry and spectroscopy of a deep Algol-like minimum of the pre-main-sequence star WW Vul in July and August 2016. This revealed substantial reddening due to absorption by circumstellar material. After dereddening, our spectra of WW Vul were consistent with spectral type A3V throughout the event. H{\alpha} is normally in emission in WW Vul. During the minimum, H{\alpha} emission dropped by ~30% and FWHM of the H{\alpha} line reduced by ~15%.