BIPOLAR JET STAR CANDIDATE: DRECHSLER OBJECT 3 "CIRCX"

The picture taken with the 1m ASA at the Chilescope shows a stellar jet, a directed (collimated) gas flow, probably ejected from star at coordinates 14 42 24.972 -61 42 10.66 (Extension of the jets: approx. 20 arc seconds)

What exactly CircX is, is currently unknown.

Possible causes:

- interacting binary star system (symbiotic stars)

- cataclysmic variable

- proto planetary nebula

- X-ray double stars (Unlikely, as there is no significant X-ray source)

- Herbig Haro object (Unlikely, because not located in a star-forming region)

- edge on galaxy (Measurements at the APEX experiment at the ALMA array make this scenario seem unlikely)

ORIGIN OF STELLAR JETS

Jets are created when an object accumulates gas from a rotating disc (accreted).

Only a part of the disk gas reaches the object, the other part flows perpendicular to the rotation plane away from the object. The collimation is caused either geometrically by the inner edge of the accretion disk or b y magnetic fields.

Magnetohydrodynamic processes are important for the formation of jets, although the details are not yet fully understood. Jets are always observed in connection with accretion, the incidence of matter from the circumstellar environment or from a companion star on a compact object. The angular momentum is effectively dissipated from an accretion disk with a highly collimated magnetic outflow. Today, the energy and angular momentum is extracted from the disk by a magnetic torque generated by a wound magnetic field in the accretion disk. If the inclination

angle is small enough, magnetic forces can accelerate matter along the field lines.

Beyond the Alfvé point, matter is also accelerated by the Lorentz force. The collimation of the jet is achieved by magnetic forces due to the toroidal structure of the magnetic field or by a higher gas pressure in the corona of the accretion disk.