Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the formation of H-alpha line emission around classical T Tauri stars   We present radiative transfer models of the circumstellar environment of
classical T Tauri stars, concentrating on the formation of the H-alpha
emission. The wide variety of line profiles seen in observations are indicative
of both inflow and outflow, and we therefore employ a circumstellar structure
that includes both magnetospheric accretion and a disc wind. We perform
systematic investigations of the model parameters for the wind and the
magnetosphere to search for possible geometrical and physical conditions which
lead to the types of profiles seen in observations. We find that the hybrid
models can reproduce the wide range of profile types seen in observations, and
that the most common profile types observed occupy a large volume of parameter
space. Conversely, the most infrequently observed profile morphologies require
a very specific set of models parameters. We find our model profiles are
consistent with the canonical value of the mass-loss rate to mass-accretion
rate ratio (mu=0.1) found in earlier magneto-hydrodynamic calculations and
observations, but the models with 0.05<mu<0.2 are still in accord with observed
H-alpha profiles. We investigate the wind contribution to the line profile as a
function of model parameters, and examine the reliability of H-alpha as a mass
accretion diagnostic. Finally, we examine the H-alpha spectroscopic
classification used by Reipurth et. al, and discuss the basic physical
conditions that are required to reproduce the profiles in each classified type.

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The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
2
The categories of this paper are: math
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
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The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio