Theoretical Position-Velocity Diagrams of Flux and Electron Density in Herbig-Haro Objects

Details Theoretical Position-Velocity Diagrams of Flux and Electron Density in Herbig-Haro Objects Theoretical Position-Velocity Diagrams of Flux and Electron Density in Herbig-Haro Objects

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.4809i&link_type=abstract

American Astronomical Society, 185th AAS Meeting, #48.09; Bulletin of the American Astronomical Society, Vol. 26, p.1388

Astronomy and Astrophysics

Astronomy

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 diagrams of flux in H_alpha , [O I]lambda lambda 6300+6363, [S II]lambda lambda 6716+6731, [O III]lambda lambda 4959+5007, and [C I]lambda lambda 9823+9850, line ratios of [O I]/H_alpha , [O I]/[S II], [S II]/H_alpha , H_alpha /[S II], and [O III]/H_alpha , and electron density N_e. We show how these position-velocity diagrams of N_e and flux vary with shock kinematics. By matching PV diagrams with observation, we can determine a narrow range of parameters for HH 1F, 2A'+H, and 43B+C. We can use line ratios and N_e (determined from a line ratio) to narrow the possible range of shock parameters. We successfully model the N_e features of HH 2A'+H as a superposition of 2 bow shocks. We also show that the effects of slight misalignments of the two diagrams to be divided can produce artifacts in line ratios and N_e which obliterate the physical features. We show that N_e in HH 1 can only be explained using the kinematical model by taking these misalignments in to account.

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