HH object

HH object

short for Herbig–Haro object.
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References in periodicals archive ?
He has made measurements of both the star and the surface brightness of the nebula close by in the region of HH-215--the most recently generated HH object associated with PV Cep.
HH objects are formed when shockwaves created by material ejected by a new star plow into surrounding nebulosity; the interaction causes the light of hydrogen atoms and sulfur ions to glow.
She is investigating emission from HH objects to see if there is enough X-radiation behind the C-shocks to produce OH via the Wardle mechanism.