Age and Temperature Dependence of X-Ray Activity at the Cool End of the Main-Sequence

Details Age and Temperature Dependence of X-Ray Activity at the Cool End of the Main-Sequence Age and Temperature Dependence of X-Ray Activity at the Cool End of the Main-Sequence

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cxo..prop.1373s&link_type=abstract

Chandra Proposal ID #05200031

Computer Science

Chandra Proposal Id #05200031

Scientific paper

We propose for ACIS imaging observations of five very low-mass field dwarfs to probe the age and temperature dependence of magnetic activity near the substellar boundary. We will observe confirmed companions to main-sequence stars (this provides the individual ages) which cover a range in effective temperature. X-rays are ubiquitously found in young pre-main sequence stars of very low masses and Brown Dwarfs, but the observation of LP 944-20 (500 Myrs) supports the idea that X-ray emission evolves as the stars (or Brown Dwarfs) age, on an as yet unknown timescale. Since the effective temperature decreases during stellar evolution a possible explanation is that cool atmospheres are too neutral to sustain stellar coronae. Our observations will be able to confirm or reject this hypothesis.

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