The Quiescent Corona of VB 10

Details The Quiescent Corona of VB 10 The Quiescent Corona of VB 10

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...594..982f&link_type=abstract

The Astrophysical Journal, Volume 594, Issue 2, pp. 982-986.

Astronomy and Astrophysics

Astronomy

26

Stars: Coronae, Stars: Low-Mass, Brown Dwarfs, X-Rays: Stars

Scientific paper

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, LX=(2.4+/-0.05)×1025 ergs s-1 and log(LX/Lbol)=-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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