Maps from the Very Large Array in the SiO (v = 0,J = 1−0) line for X Her. The upper panels show 2 km s-1 wide channel maps, and the lower panels show position (in arcsecs, along the vertical axis) – velocity (in km s-1, along the horizontal axis) diagrams along the NE–SW [labelled (+4, +4) to (–4, –4)] and NW–SE [labelled (+4, –4) to (–4, +4)] directions. Velocities are with respect to the local standard of rest (systemic velocity of X Her is –72.5 km s-1). The lower panels show evidence of a bipolar outflow in the NE–SW direction (thus perpendicular to the space motion) and of a rotating disk in the NW–SE direction. The contour increments are 10 mJy km s-1 per beam for the channel maps in the upper panel and 5 mJy per beam for the position-velocity diagrams in the lower panel. The beam size is 0.45″ × 0.40″ (with a position angle of − 88deg).
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