SETI public: Optical Spectroscopy of a Flare on Barnard's Star

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Paper: astro-ph/0511281
Date: Wed, 9 Nov 2005 18:49:03 GMT (94kb)

Title: Optical Spectroscopy of a Flare on Barnard's Star

Authors: D. Paulson, J. Allred, R. Anderson, S. Hawley, W. Cochran and S.
Yelda

Comments: Accepted for publication in PASP
\\
We present optical spectra of a flare on Barnard's star. Several
photospheric
as well as chromospheric species were enhanced by the flare heating. An
analysis of the Balmer lines shows that their shapes are best explained by
Stark broadening rather than chromospheric mass motions. We estimate the
temperature of the flaring region in the lower atmosphere to be >8000 K and
the
electron density to be ~10^14 cm^{-3}, similar to values observed in other
dM
flares. Because Barnard's star is considered to be one of our oldest
neighbors,
a flare of this magnitude is probably quite rare.

\\ ( http://arXiv.org/abs/astro-ph/0511281 , 94kb)

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