LONG-SLIT SPECTROSCOPY. Characteristic optical spectra: emission lines; weak or lack continuum. [SII] images of HH 83. Relative line strengths vary along the jet. Reipurth, A&A, 220, 249 (1989 ). Continuum contribution from the source. Spectra at different distances from the source. PA.
Characteristic optical spectra: emission lines; weak or lack continuum
Relative line strengths vary along the jet.
Reipurth, A&A, 220, 249 (1989)
from the source
Spectra at different distances from the source
The knots move away from the source with velocities in the range 100-200 km/swith a large spread (velocities as high as 500 km/s have been measured).
In contrast, the shock velocities (inferred from their spectrum) never exceed 100 km/s.
Estimated electron densities are typically in the range 100-1000 cm-3.
Ionization fractions are quite uncertain but have estimated values around 0.1.
Flow velocities:100- 500 km/s
Mass loss rates: (quite uncertain) : 10-9 to 10-7 Msun/yr.
Momentum rates:10-7 and 10-5 Msun/yr km/s ( much greater than the momentum rate available in radiation Lsource/c).
Mechanical luminosities: typically around one solar luminosity.