Other
Scientific paper
Sep 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001tysc.confe..29t&link_type=abstract
Two Years of Science with Chandra, Abstracts from the Symposium held in Washington, DC, 5-7 September, 2001, meeting abstract.
Other
Normal Stars And White Dwarfs
Scientific paper
With mass well below the hydrogen burning mass limit (< 0.08 Msolar), brown dwarfs (hereafter BDs) had been expected to have no high energy activity. Surprisingly, however, persistent X-rays from several young BDs and BD candidates (1-5 Myr old) in star-forming regions, were detected with ROSAT and Chandra (ex. Neuhäuser et al. 1999, Imanishi et al. 2001). Recently, X-ray flares from old BDs (0.5-1 Gyr) were also observed with Chandra (Fleming et al. 2000; Rutledge et al. 2000), while no steady X-ray was found from them. On the other hand, no X-ray data has been available for BDs of intermediate ages (3-100 Myr). To give definite restriction to the evolution of BDs, we executed Chandra observations of an intermediate age (10 Myr) BD TWA-5B. The BD lies 55 pc away from the earth with mass of 15-40 Mjup, and is a companion of a T Tauri star TWA-5A. Although the separation to the primary is only 2'', we detected X-rays from TWA-5B, with superior spatial resolution of Chandra/ACIS. We will present X-ray properties obtained from spectral and timing analysis, and discuss the X-ray evolution of BDs.
Chartas George
Feigelson Eric
Garmire Gordon
Maeda Yoshiaki
Mori Kaya
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