We summarise the properties and nature of a peculiar group of B-type stars called FS CMa stars. These stars show the B[e] phenomenon, i.e., their spectra exhibit both forbidden emission lines and infrared excess. Such properties point to an extended circumstellar gas and dust component. Although the phenomenon has been explained in most B[e] stars, the origin and nature of FS CMa stars is disputed. Here, we focus on the merger hypothesis, for which evidence has recently been discovered.
@article{arxiv.2604.11907,
title = {Intermediate-Mass Mergers: A New Scenario for Several FS CMa Stars},
author = {Daniela Korcakova and Nela Dvorakova and Iris Bermejo Lozano and Gregg A. Wade and Alicia Moranchel Basurto and Pavel Kroupa and Raul Ortega Chametla and Colin Peter Folsom and Ondrej Juhas},
journal= {arXiv preprint arXiv:2604.11907},
year = {2026}
}
Comments
invited talk at the conference: "Hot Stars: Life with Circumstellar Matter", October 14-19, 2024, Almaty, Kazakhstan