Kinematics and evolution of the HH 34 complex

Details Kinematics and evolution of the HH 34 complex Kinematics and evolution of the HH 34 complex

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104.2193h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 104, no. 6, p. 2193-2212.

Astronomy and Astrophysics

Astronomy

76

Body Kinematics, Evolution (Development), Herbig-Haro Objects, Jet Flow, Bow Waves, Celestial Reference Systems, Charge Coupled Devices, Shock Waves

Scientific paper

The kinematics and evolution of the HH 34 complex are discussed on the basis of proper motions and radial velocities. The bow shocks on the opposite sides of the source are found to recede from it at highly supersonic velocities (about 330 km/s) along a tightly defined axis inclined at an angle of about 30 deg to the plane of the sky. The space velocity determined for the HH 34 bow shock is substantially greater than its shock velocity, about 160 km/s, derived spectroscopically. Faint emission was detected, at the appropriate radial velocity, from the region just ahead of HH 34. From the existence of multiple bow shocks in the approaching lobe of the flow it is inferred that the driving source has experienced repeated episodes of enhanced mass loss at intervals of about 400 yr. It is suggested that each successive outflow imparts an impulse to the ambient medium incrementally accelerating to it a large fraction of the outflow velocity.

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