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The Quiescent Corona of VB 10

by: T. A. Fleming, M. S. Giampapa, D. Garza
The Astrophysical Journal, Vol. 594, No. 2. (September 2003), pp. 982-986, doi:10.1086/376968  Key: citeulike:11896519

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Abstract

We present results from a Chandra ACIS observation of the M8 dwarf star VB 10, a star near the hydrogen-burning mass limit. Until now, VB 10 has only been detected to flare at X-ray wavelengths. We can now report that nonflare, “quiescent,” X-ray emission has been detected with a luminosity, L<SUB>X</SUB>=(2.4+/-0.05)×10<SUP>25</SUP> ergs s<SUP>-1</SUP> and log(L<SUB>X</SUB>/L<SUB>bol</SUB>)=-4.9. This is consistent with the previous ROSAT nondetections of quiescent emission from VB 10. We discuss the implications of this discovery for the nature of coronae in ultracool dwarfs.


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