Radio Observations of Brown Dwarfs

Details Radio Observations of Brown Dwarfs Radio Observations of Brown Dwarfs

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.1101q&link_type=abstract

American Astronomical Society Meeting 205, #11.01; Bulletin of the American Astronomical Society, Vol. 36, p.1351

Astronomy and Astrophysics

Astronomy

Scientific paper

Radio emission commonly signifies the presence of magnetic activity in the coronae of late-type stars, while emission from the H-alpha transition is a sign of magnetic activity in their chromospheres. Surveys of H-alpha emission from ultracool dwarfs of spectral types late M, L, and T have not shown this indicator of magnetic activity. As a result, it was believed that all magnetic activity declined in these cool bodies. Although sparse, the most recent detections of radio emission contradict this behavior. As part of a large VLA survey of nearby ultracool dwarfs out to 13pc, the aim of my research was to determine how common radio emission is in these late-type stars. Data from 9 L and T dwarfs was reduced, and evidence for emission was detected from three of these objects. This research was conducted as a part of the NRAO Summer Student program, with partial funding from the National Science Foundation.

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