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2013MNRAS.428..691H - Mon. Not. R. Astron. Soc., 428, 691-711 (2013/January-1)
Mapping the complex kinematics of LL objects in the Orion nebula.
HENNEY W.J., GARCIA-DIAZ MA.T., O'DELL C.R. and RUBIN R.H.
Abstract (from CDS):
We also measure the line-of-sight velocity for multiple knots in the HH 888 and HH 505 jets, and combine our spectroscopy with new and existing proper-motion measurements to reconstruct the three-dimensional kinematics of the jets. The knot motions in both jets are very similar: both flows are inclined at 40° to 60° from the plane of the sky, with exclusively redshifted knots to the north and exclusively blueshifted knots to the south. In both cases, one also sees a deceleration along the length of the jets, from >200kms-1 close to the respective stars down to <100kms-1 farther out. The marked contrasts that we find between the kinematics of the jets and the kinematics of the stellar bowshocks are evidence that the two phenomena are not causally related. Regular patterns in the dynamic ages of the HH 505 knots imply periodic ejections on three different time-scales: 50, 12 and 4 yr.
We use line ratios and photometry to measure electron densities and excitation/ionization conditions in the stellar bowshocks and jet knots. The LL 1 bowshock has a bright inner shell with density ≃3000cm-3 (compared with a local nebula density of ≃1000cm-3) and line ratios that are consistent with equilibrium photoionization models. The bowshock also has a fainter outer rim, where the line ratios show evidence of shock excitation. Many of the jet knots also show evidence for a shock contribution to their excitation and have densities from 1000 to 8000cm-3.
Abstract Copyright: © 2012 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2012)
Journal keyword(s): techniques: spectroscopic - Hii regions - ISM: Herbig-Haro objects - ISM: individual objects: Orion nebula - ISM: jets and outflows
CDS comments: Fig.1: HH 808 is a misprint for HH 888.
Simbad objects: 20
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