Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Heating of a Star by Disk Accretion   We examine various ways in which disk accretion can heat an accreting star.
These include 1) radiation emitted from the disk surface which is intercepted
by the stellar surface, 2) radiative flux directly across the disk-star
interface, and 3) advection of thermal energy from the disk into the star. For
each of these, the physics of the boundary layer between the disk and the star
is crucial to determining the amount of stellar heating that occurs.
  We assess the importance of the methods listed above for heating the star in
accreting pre-main-sequence stars and cataclysmic variables, using recent
models of boundary layers in these systems. We find that intercepted radiation
tends to be the most important source of stellar heating in thin disk systems
such as T Tauri stars and high-$\dot M$ cataclysmic variables. We argue that
direct radiation across the disk-star interface will be unimportant in
steady-state systems. However, it may be important in outbursting systems,
where the disk temperature rises and falls rapidly. Advection of thermal energy
into the star becomes the dominant source of stellar heating in thick disk
systems such as FU Orionis objects.

19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio