Theoretical position-velocity diagrams of flux, electron density, and electron temperature in Herbig-Haro objects

Details Theoretical position-velocity diagrams of flux, electron density, and electron temperature in Herbig-Haro objects Theoretical position-velocity diagrams of flux, electron density, and electron temperature in Herbig-Haro objects

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....109..752i&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 109, no. 2, p. 752-761

Astronomy and Astrophysics

Astronomy

10

Astronomical Models, Electron Density (Concentration), Electron Energy, Flux Density, Herbig-Haro Objects, Position (Location), Velocity, Carbon, H Alpha Line, Kinematics, Line Spectra, Mathematical Models, Oxygen, Shock Waves, Sulfur

Scientific paper

Many features of Herbig-Haro objects can be reproduced using a kinematical bow shock model. We use the model to generate position-velocity (PV) diagrams of flux in H-alpha (O I) lambda lambda 6300+63, (S II) lambda lambda 6716+31, (O III) lambda lambda 4959+5007, and (C I) lambda lambda 9823+50, line ratios of (O I)/H-alpha, (O I)/(S II), (S II)/H-alpha, H-alpha(S II), and (O III)/H-alpha, electron density Ne, and electron temperature Te. We show how position-velocity diagrams of Ne and flux vary with shock velocity. By matching the diagrams from single lines, the line ratios, and Ne with observations, we determined a narrow range of shock parameters for HH 1F, 2(A' + H), and 43 (B + C). We model the Ne features of HH 2(A' + H) as a superposition of two bowshocks. We also show that the effects of slight misalignments of the two diagrams to be divided can produce artifacts in the line ratios and Ne which obliterate the physical features. We show that Ne in HH 1 can only be explained using the kinematical model by taking these misalignments into account.

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