10–14 Jun 2024
INAF - Observatory of Rome
UTC timezone

Variability of continuum radius and moleculer layers of R Car and VX Sgr using VLTI-GRAVITY

11 Jun 2024, 09:40
20m
Sala Gratton (INAF - Observatory of Rome)

Sala Gratton

INAF - Observatory of Rome

Via Frascati 33, 00040 Monte Porzio Catone

Speaker

Daniel Jadlovský (European Southern Observatory & Masaryk University)

Description

Red giants and supergiants lose substantial fraction of their mass during their evolution and thus significantly contribute to the chemical enrichment of the interstellar medium. While the dust-driven wind coupled with pulsations can mostly explain the observed mass-loss rates of red giants on the asymptotic giant branch, this is not the case for red supergiants.

We obtained several epochs of Mira-type variable R Car and red supergiant VX Sgr, using spatially resolved near-infrared interferometry observations on VLTI-GRAVITY. We compare the observations with the state-of-the-art 1D and 3D models and archival data. This allows us to study regions close to stellar surface, where the mass-loss process is initiated, namely the continuum radius and the extended molecular layers, and also compare the structure and levitation of atmosphere between oxygen-rich Mira-type giants and red supergiants.

Primary author

Daniel Jadlovský (European Southern Observatory & Masaryk University)

Co-authors

Andrea Chiavassa (OCA) Kateryna Kravchenko (MPE) Markus Wittkowski (ESO)

Presentation materials