A new outburst of the yellow hypergiant star $\rho$ Cas

TL;DR

This paper reports the detection of a new outburst in the yellow hypergiant star $ ho$ Cas in 2013, characterized by spectroscopic and photometric changes indicating a significant atmospheric event.

Contribution

The study provides the first detailed spectroscopic and photometric analysis of a recent outburst in $ ho$ Cas, enhancing understanding of hypergiant stellar variability.

Findings

Development of TiO bands indicating atmospheric cooling

Photometric brightness drop of about 0.6 mag

Spectroscopic features consistent with a later spectral type

Abstract

Spectroscopic monitoring of the yellow hypergiant $\rho$ Cas revealed a new outburst in 2013, which is obvious from the development of TiO bands in the spectra. Also many atmospheric lines characteristic for a later spectral type appear. This spectroscopic outburst is in agreement with the photometric light curve, which displays a drop by about 0.6 mag during the same period.