High-resolution bispectrum speckle interferometry and speckle polarimetry of the southern outflow lobe of S140 IRS1.
Some - perhaps all - newly formed stars go through a turbulent phase of adolescence in which they eject streams of gas that collide with the surrounding molecular cloud material. The figure below shows the first bispectrum speckle interferometry image of the young stellar object S140~IRS1 and its southern outflow. Radio interferometric observations proved that this outflow is in fact bipolar. The northern lobe shows redshifted emission and is thus pointing away from us. Consistently, the northern part of the outflow cavity is not visible at near infrared wavelengths. The observations suggest that S140 IRS1 is a massive young star surrounded by an optically thick circumstellar disk. The outflow perpendicular to this disk is clearing a polar cavity, which can be seen in scattered stellar light at the cavity walls.