Theoretical Position-Velocity Diagrams of Flux and Electron Density in Herbig-Haro Objects
**Previous
abstract** **Next
abstract**

**Session 48 -- Young Stars**
*Display presentation, Tuesday, 10, 1995, 9:20am - 6:30pm*

## [48.09] Theoretical Position-Velocity Diagrams of Flux and Electron Density in Herbig-Haro Objects

*R. Indebetouw (Maria Mitchell Observatory), A. Noriega-Crespo (MMO and IPAC)*
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.

**Tuesday
program listing**