Other
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002an....323..157s&link_type=abstract
Astronomische Nachrichten, vol. 323, no. 3/4, p. 157-164
Other
12
Sunspots, Starspots, Magnetic Fields, Mhd, Instrumentation
Scientific paper
What is the nature of what we commonly refer to as starspots? The answer to that question determines what we can learn from the study of starspots about stars, their internal dynamics, and their magnetic activity. Observations of the Sun, the only cool star that we can observe in detail, naturally led to the hypothesis that starspots in other cool stars are magneto-convective phenomena in which a magnetic field substantially affects the structure of a stellar atmosphere. Spectral line features, eclipse light curves, and intensity modulations are consistent with that hypothesis. Yet for almost all stars for which starspots are reported, the surface coverage is very much higher than for the Sun, while many stars manifest spots at high latitudes where the Sun has never been seen to do so. In this review, I address how well starspots compare to sunspots, discuss some differences expected when moving away from the Sun in the HR diagram or in level of activity, and identify resources to further deepen our understanding.
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