Hα EMISSION VARIABILITY IN THE γ-RAY BINARY LS I +61 303
Hα EMISSION VARIABILITY IN THE γ-RAY BINARY LS I +61 303
LS I +61 303 is an exceptionally rare example of a high-mass X-ray binary that also exhibits MeV–TeV emission, making it one of only a handful of "γ-ray binaries." Here we present Hα spectra that show strong variability during the 26.5 day orbital period and over decadal timescales. We detect …