Herbig-Haro objects—tracers of the formation of low-mass stars and sub-stellar objects |
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Authors: | Bringfried Stecklum Helmut Meusinger Dirk Froebrich |
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Institution: | (1) Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778 Tautenburg, Germany;(2) Centre for Astrophysics & Planetary Science, University of Kent, Canterbury, Kent, CT2 7NH, UK |
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Abstract: | Herbig-Haro objects (HHOs) are caused by outflows from young objects. Since the outflow relies on mass accretion from a circumstellar
disk, it indicates ongoing growth. Recent results of infrared observations yielded evidence for disks around brown dwarfs.
This suggests that at least a certain fraction of brown dwarfs forms like stars. Thus, young sub-stellar objects might cause
HHOs as well. We present selected results of a general survey for HHOs based on DSS-II plates and CCD images taken with the
Tautenburg Schmidt telescope. Numerous young objects could be identified due to their association with newly detected HHOs.
In some cases the luminosity is consistent with very low-mass stars or close to sub-stellar values. This holds for L1415-IRS
and a few infrared sources embedded in other dark clouds (e.g., GF9, BHR111). The question on the minimum mass for outflow
activity is addressed. |
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Keywords: | ISM: clouds individual(GF9 LDN1415 BHR111) Herbig-Haro objects individual(HH892) jets and outflows Stars: formation low-mass brown dwarfs individual(BHR111-IR IRAS04376+5413 IRAS20503+6006) |
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