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Science 2 October 1998:
Vol. 282. no. 5386, p. 9
DOI: 10.1126/science.282.5386.9h
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This Week in Science

Brown dwarfs are dim objects that are more massive than planets, but not massive enough to maintain nuclear fusion in their cores and burn as brightly as stars. Since 1995, unambiguous detections of brown dwarfs have started to account for some of the missing mass in the universe and provide more details about this once missing link between planets and stars. Neuhäuser and Comerón (p. 83; see the news story by Schilling) have used the Röntgen Satellite to detect x-ray emission from a very young, very low mass brown dwarf (Cha Ha 1) in the Chamaeleon I star-forming cloud. They believe that this x-ray emission is related to convection within Cha Ha 1 or rotation of the brown dwarf. Like some low-mass young stars, fast rotation would create a dynamo and maintain a magnetic corona.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)