Detection of Quiescent Extreme Ultraviolet Emission from the Very Low Mass Dwarf van Biesbroeck 8: Evidence for a Turbulent Field Dynamo

Details Detection of Quiescent Extreme Ultraviolet Emission from the Very Low Mass Dwarf van Biesbroeck 8: Evidence for a Turbulent Field Dynamo Detection of Quiescent Extreme Ultraviolet Emission from the Very Low Mass Dwarf van Biesbroeck 8: Evidence for a Turbulent Field Dynamo

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...469..828d&link_type=abstract

Astrophysical Journal v.469, p.828

Astronomy and Astrophysics

Astronomy

26

Magnetohydrodynamics: Mhd, Stars: Coronae, Stars: Individual Name: Van Biesbroeck 8, Stars: Low-Mass, Brown Dwarfs, Turbulence, Ultraviolet: Stars

Scientific paper

We report the detection of quiescent EUV emission from the very low mass dwarf VB 8 by the Extreme Ultraviolet Explorer (EUVE) in the Lexan/B band (65-190 Å). We interpret this emission in terms of a hot coronal plasma and combine this information with previous X-ray detections to estimate the quiescent plasma temperature and emission measure. The combined observations made by Einstein, ROSAT, and EUVE between 1979 and 1994 are consistent with a quiescent coronal plasma temperature of (2-6) x 106 degrees and indicate the same emission measure to within a factor of about 2. The nonflaring corona of VB 8 then appears relatively constant over timescales of more than 10 yr. Our results are consistent with the picture of a turbulently driven or distributive dynamo for VB 8, rather than with a large-scale field dynamo which appears to dominate the solar corona. Evidence from X-ray and optical data concerning the long-term coronal variability of the more active stars of higher mass also points toward the idea that active late-type stars in general are dominated by a turbulent dynamo.

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