The nebulae around LBVs: a multiwavelength approach

TL;DR

This study uses multiwavelength observations to analyze nebulae around LBVs, revealing asymmetric mass-loss and interactions between gas and dust, to better understand the LBV phenomenon.

Contribution

It introduces a multiwavelength approach combining IR and radio data to study LBV nebulae and their mass-loss history, highlighting gas-dust interactions.

Findings

Evidence of asymmetric mass-loss in LBV nebulae

Detection of gas and dust interactions

Insights into nebula composition from spectral analysis

Abstract

We present first results of our study of a sample of Galactic LBV, aimed to contribute to a better understanding of the LBV phenomenon, by recovering the mass-loss history of the central object from the analysis of its associated nebula. Mass-loss properties have been derived by a synergistic use of different techniques, at different wavelengths, to obtain high-resolution, multi-wavelength maps, tracing the different emitting components coexisting in the stellar ejecta: the ionized/neutral gas and the dust. Evidence for asymmetric mass-loss and observational evidence of possible mutual interaction between gas and dust components have been observed by the comparison of mid-IR (Spitzer/IRAC, VLT/VISIR) and radio (VLA) images of the nebulae, while important information on the gas and dust composition have been derived from Spitzer/IRS spectra.