Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-06-19
Astronomy and Astrophysics
Astrophysics
9 pages, 5 (9) figures; fig. 1-4 are available only in the preprint or in the ps-file via <http://www.xray.mpe.mpg.de/~stelz
Scientific paper
10.1051/0004-6361:20020887
We have carried out an extensive search for X-ray emission from young, very low-mass objects near and beyond the substellar limit, making use of archived ROSAT PSPC and HRI observations pointed at Brown Dwarfs and Brown Dwarf candidates in the young sigma Orionis and Taurus-Auriga associations. In sigma Ori we identify three Brown Dwarf candidates with X-ray sources; in Taurus-Auriga we add one further X-ray detection of a Brown Dwarf to the list published earlier. We combine this data with all previously X-ray detected Brown Dwarfs and Brown Dwarf candidates in young stellar associations and star forming regions to perform a study of stellar activity parameters on the as yet largest sample of young, very low mass objects. A similar relation between X-ray and bolometric luminosity, and H-alpha emission, respectively, as is known for T Tauri stars seems to hold for young objects down to the substellar limit, too. No signs for a change in X-ray activity are found on the transition to substellar masses.
Mokler Felicitas
Stelzer Beate
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