Comparison of the spectrum of a sunspot-like star with a sunspot

Details Comparison of the spectrum of a sunspot-like star with a sunspot Comparison of the spectrum of a sunspot-like star with a sunspot

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002an....323..321l&link_type=abstract

Astronomische Nachrichten, vol. 323, no. 3/4, p. 321-324

Astronomy and Astrophysics

Astronomy

3

Sun: Sunspots, Stars: Spots, Stars: Chromospheres, Stars: Coronae, Ultraviolet Emission, X-Rays

Scientific paper

A typical sunspot umbra has an effective temperature, gravity, and strong magnetic field strength similar to the dM1e star AU Microscopii. We compare STIS, Chandra, EUVE, and FUSE spectra of AU Mic with typical spectra of sunspots to characterize the major differences and then compare models of AU Mic with sunspot models. We find that the emission, heating rates, and differential emission measure distributions are very different for AU Mic and sunspots, and conclude that the root cause of the difference lies in the very different geometries of the two magnetic fields.

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