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Comparison of the spectrum of a sunspot‐like star with a sunspot
Author(s) -
Linsky J.L.,
Ayres T.R.,
Brown A.,
Osten R.A.
Publication year - 2002
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/1521-3994(200208)323:3/4<321::aid-asna321>3.0.co;2-h
Subject(s) - sunspot , physics , astrophysics , spectral line , magnetic field , astronomy , quantum mechanics
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.