SIMBAD references

eta Carinae is a unique object among the most massive evolved stars in the LBV phase. The central object(s) is(are) surrounded by a complex circumstellar nebula ejected during more than one eruption in the 19th century. Beyond the well-defined edges of its famous bipolar nebula, the Homunculus, are additional nebulous features referred to as the outer ejecta. The outer ejecta contains a large variety of structures of very different sizes and morphologies distributed in a region 0.67 pc in diameter. Individual features in the outer ejecta are moving extremely fast, up to 3200 km/s, in general the expansion velocities are between 400-900 km/s. A consequence of these high velocities is that structures in the outer ejecta interact with the surrounding medium and with each other. The strong shocks that arise from these interactions give rise to soft X-ray emission. The global expansion pattern of the outer ejecta reveals an overall bipolar distribution, giving a symmetric structure to its morphologically more irregular appearance. The long, highly collimated filaments, called strings, are particularly unusual. The material in the strings follows a Hubble-flow and appears to originate at the central object.