Revisiting the evolved hypergiants in the Magellanic Clouds

• DOI: 10.1093/mnras/stac386
• Publication Date: 2022-02-10T20:11:05Z
• Authors: M Kourniotis; M Kraus; O Maryeva; M Borges Fernandes; G Maravelias
• Keywords: Large Magellanic Cloud

The massive stars that survive the phase of red supergiants (RSGs) spend rest their life in extremity. Their unstable atmospheres facilitate formation and episodic ejection shells alter stellar appearance surroundings. In present study, we revise evolutionary state eight hypergiants Magellanic Clouds, four early-A type FG type, complement short list eruptive post-RSGs termed as yellow (YHGs). We refine outdated temperatures luminosities by means high-resolution spectroscopy with FEROS. A-type are suggested to be early, post-main sequence phase, showing spectrophotometric characteristics redward evolving supergiants. On other hand, FG-type manifest themselves through enhanced atmospheric activity is traced emission filling H$\alpha$ dynamical modulation low-excitation BaII line. Of these stars, dusty HD269723 have recently departed from a cool phase. identify double-peaked FEROS data HD269953 emerges an orbiting disk-hosting companion. highlight study episode mass loss HD271182 manifests dimming event lightcurve renders star "modest" analogue $\rho$ Cas. luminosity $\log(L/L_{\odot})= 5.6$ can serve updated threshold for exhibiting post-RSG evolution Large Cloud.