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The mass distribution of stellar mergers: A new scenario for several FS CMa stars by Dvořáková, N.; Korčáková, D.; Dinnbier, F.; Kroupa, P. is a scholarly article available to read on EtoBox.

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(Abreviated) FS CMa stars belong to a diverse group of stars exhibiting the B[e] phenomenon, which is manifested mainly by the presence of forbidden emission lines and a~strong infrared (IR) excess in their spectra. Recently, a strong magnetic field has been discovered in the FS CMa star IRAS 17449+2320. Its strength and an unusually high space velocity point to a post-merger nature. Stellar mergers may provide an explanation for the complex and sometimes chaotic behaviour of some of the FS CMa stars. We did a statistical study of numerical simulations using Aarseth's NBODY6 code. We show the importance of stellar mergers of low- to intermediate-mass stars (from $\approx$ 1.4 to $\approx$ 8 $\text{M}_{\odot}$) and for B-type stars in particular. We analysed two sets of N-body simulations with different initial orbital period distributions. In the simulations, more massive binaries are treated differently than less massive binaries and the mass limit usually used is 5 $\text{M}_{\odot}$. We also used the value of 2 $\text{M}_{\odot}$ to test the influence of this ambiguous limit on the results. Looking at mass, distance from their birth cluster, and velocity distributions, we invest

Author

Dvořáková, N.; Korčáková, D.; Dinnbier, F.; Kroupa, P.

Published

2024

Language

EN