2003ApJ...594..982F

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_X=(2.4±0.05)x10²⁵ ergs/s and log(L_X/L_bol)=-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.