Deriving Physical Diagnostics from Observations

Details Deriving Physical Diagnostics from Observations Deriving Physical Diagnostics from Observations

Mar 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010lnp...793..213d&link_type=abstract

Jets from Young Stars IV, Lecture Notes in Physics, Volume 793. ISBN 978-3-642-02290-6. Springer-Verlag Berlin Heidelberg, 2010,

Physics

1

Scientific paper

We review in this course diagnostics for the physical conditions in the atomic component of the flow (electronic densities nê, electronic temperatures T e and hydrogen ionization fraction x e ) based on the most prominent optical and near-infrared forbidden emission lines. We discuss both diagnostics independent of the excitation process and methods based on the comparison with radiative shock models. We then detail the different techniques used to derive jet mass-loss rates, an important parameter for launching models, and their associated uncertainties. Finally, we describe important biases introduced by projection and convolution effects which can critically affect the translation of observed quantities into meaningful physical quantities of the flow.

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