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Spectrophotometric evidence for velocity variability in the HH 34 and HH 111 stellar jets

1993; Institute of Physics; Volume: 106; Linguagem: Inglês

10.1086/116713

1538-3881

Jon A. Morse, Steve Heathcote, Patrick Hartigan, Gerald Cecil,

Laser-Plasma Interactions and Diagnostics

view Abstract Citations (49) References (32) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Spectrophotometric Evidence for Velocity Variability in the HH 34 and HH 111 Stellar Jets Morse, Jon A. ; Heathcote, Steve ; Hartigan, Patrick ; Cecil, Gerald Abstract We present Fabry-Perot observations and long-slit spectrophotometry of the collimated jet regions of the HH 34 and HH 111 outflows. There is a close correlation between the observed forbidden S II flux and the electron density in the bright low-excitation knots in both the HH 34 jet and the HH 111 jet. The electron densities in some of the low-excitation HH 111 jet knots exceed 2500/cu cm, from which we infer that the true gas densities may be significantly higher than 10 exp 4/cu cm because the peak ionization is only a few percent for such weak shocks. We detect weak forbidden O III 5007 A emission from the HH 111 jet knot L, which implies that the shock velocity for this knot is 100 km/s. This knot also has a large velocity dispersion (200 km/s) and bow-shaped morphology (Reipurth et al., 1992). We argue that such a feature cannot be explained by models in which knots correspond to internal shock waves excited by boundary layer instabilities, but is consistent with an internal working surface in a velocity-variable outflow. We review evidence for multiple ejections in each of these stellar jets. Publication: The Astronomical Journal Pub Date: September 1993 DOI: 10.1086/116713 Bibcode: 1993AJ....106.1139M Keywords: Herbig-Haro Objects; Jet Flow; Stellar Spectrophotometry; Boundary Layer Stability; Density Distribution; H Alpha Line; Interstellar Extinction; Shock Waves; Astrophysics; STARS: PRE-MAIN SEQUENCE; STARS: ABUNDANCES; CIRCUMSTELLAR MATTER full text sources ADS | data products SIMBAD (23)