Kinematics of luminous blue variables in the Large Magellanic Cloud

ABSTRACT We study the kinematics of luminous blue variables (LBVs) in Large Magellanic Cloud (LMC). Using high-resolution spectra, we measure systemic radial velocities for a sample 16 LBVs and LBV candidates. In order to net motion compared their local environments, subtract projected line-of-sight velocity at same location derived from rotation curve model LMC. nebular wind emission lines, infer dispersion $40.0^{+9.9}_{-6.6}$ km s−1. To put context with other evolved massive stars, compare this red supergiants (RSGs) LMC, which have significantly smaller $16.5^{+0.4}_{-0.6}$ Moreover, 33 per cent more than 25 s−1, while only 9 RSG such high velocities. This suggests that include runaways population stars evolves become RSGs, indicating are preferentially kicked by companion’s supernova explosion as stars. Our investigation reveals interesting clues about LMC well. find widths lines each target remain constant over several epochs, whereas measured absorption exhibit highly variable R110, R81, S Dor, Sk-69°142a, Sk-69°279. These five probably binary companion. Additionally, Sk-69°142a experienced its second outburst 2019 September, shifting status candidate confirmed LBV.