SIMBAD references

Bispectrum speckle interferometry is employed to explore the immediate environment of the deeply embedded young stellar object S140 IRS1. A K'-band (2.0-2.3µm) diffraction-limited resolution of 76mas (∼70AU) is achieved with the SAO 6 m telescope, as well as a dynamical range of more than 8 mag and a field of view of 13''x21''. Our image exhibits many previously unseen complex structures. In addition to the bright, elongated, and very clumpy feature pointing from the central source to the south-east, which was already discussed in a previous paper (Schertl et al., 2000A&A...361L..29S), we find several arc-like structures north-east of IRS1, extended diffuse emission south of IRS1, and four new point sources. The diffuse and fragmentary structures close to IRS1 appear to trace circumstellar material swept up by energetic outflows. In combination with molecular line emission maps from the literature, our image provides direct confirmation that two distinct bipolar outflow systems continue to be driven from IRS1 on scales between 3'' and 100''. A system of three arc-like structures to the north-east is consistent with cavities excavated by a precessing jet or wind-driven outflow. We discuss the implications for the nature of the central source.