Services on Demand
Journal
Article
Indicators
Cited by SciELO
Access statistics
Related links
Similars in SciELO
Share
Revista mexicana de física
Print version ISSN 0035-001X
Abstract
SANCHEZ, N and LOPEZ, E. Stability of thermal structures with an internal heating source. Rev. mex. fis. [online]. 2008, vol.54, n.2, pp.86-92. ISSN 0035-001X.
We study the thermal equilibrium and stability of isobaric, spherical structures having a radiation source located at their center. The thermal conduction coefficient, external heating and cooling rates are represented as power laws of the temperature. The internal heating decreases with distance from the source r approximately as ~ exp(-τ)/r2, τ being the optical depth. We find that the influence of the radiation source is important only in the central region, but its effect is enough to make the system thermally unstable above a certain threshold central temperature. This threshold temperature decreases as the internal heating efficiency increases, but, otherwise, it does not depend on the structure size. Our results suggest that a solar-like star migrating into a diffuse interstellar region may destabilize the surrounding medium.
Keywords : Hydrodynamics; instabilities; interstellar medium.