X-ray emission from old and intermediate age brown dwarfs
Abstract
According to the paradigm of solar-type dynamo action brown dwarfs should not exhibit magnetic activity as they are fully convective. Indeed, Halpha observations of ultracool field dwarfs indicate a decline of activity setting in near the substellar limit. X-ray emission traditionally serves as another means to examine magnetic activity on stars. The substellar regime can now be accessed with the new generation of X-ray instruments onboard XMM-Newton and Chandra. We report on two recent XMM-Newton observations of brown dwarfs in the Pleiades cluster and in the field aiming to constrain the age and effective temperature dependence of X-ray emission from substellar objects.
Cite
@article{arxiv.astro-ph/0206284,
title = {X-ray emission from old and intermediate age brown dwarfs},
author = {B. Stelzer and R. Neuhaeuser},
journal= {arXiv preprint arXiv:astro-ph/0206284},
year = {2007}
}
Comments
4 pages, to appear in proceedings of the IAU Symposium 211 on "Brown Dwarfs", ASP Conference Series