Herbig-Haro Outflows and Jets from High-Luminosity Young Stellar Objects
Energetic mass loss in pre-main-sequence stars is indicated by several different phe-nomenae, e.g. P Cygni profiles in their spectra or associated CO outflows. One of the most interesting phenomenae are highly collimated bipolar outflows. Important tracers for this mass loss component are Herbig-Haro objects and jets, which represent gas heated by high-velocity shocks (vshock ≈ 30–200 km s-1). Probably due to observational selection effects, nearly all Young Stellar Objects (YSOs) with associated Herbig-Haro outflows are low-luminosity ones (Lbol ≈ 1–100 L⊙) such as T Tauri stars (TTSs). To overcome this bias, a survey of high-luminosity YSOs (Lbol ≥ 1000 L⊙) has been carried out in order to discover Herbig-Haro objects and jets near them. The target sample consisted of 27 YSOs (Lbol ≈ 1000–90000 L⊙) such as Herbig Ae/Be stars, out of which finally 8 were discovered to be asso ciated with Herbig-Haro outflows. The outflow properties and in part those of the source stars were investigated and compared with the properties of the numerous well known outflows associated with low-luminosity YSOs.
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