X-ray emission from old and intermediate age brown dwarfs

Details X-ray emission from old and intermediate age brown dwarfs X-ray emission from old and intermediate age brown dwarfs

2002-06-17

arxiv.org/abs/astro-ph/0206284v1

Astronomy and Astrophysics

Astrophysics

4 pages, to appear in proceedings of the IAU Symposium 211 on "Brown Dwarfs", ASP Conference Series

Scientific paper

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.

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