Physics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5870s&link_type=abstract
HST Proposal ID #5870
Physics
Hst Proposal Id #5870 Cool Stars
Scientific paper
The Maunder minimum (and similar episodes occurring every few centuries) is a poorly understood 75 year period in which the normal solar magnetic dynamo cycle was temporarily interrupted. Its study is important for understanding the generation and evolution of solar/stellar magnetic fields, and for the possible influence of magnetic flux on the Sun's luminosity and hence on earth's climate. We propose to study the Maunder mimimum state by obtaining HRS spectra of a sample of solar-like stars which appear to be in the stellar analog of the Maunder minimum: i.e., stars with weak, nonvariable Ca II emission and long periods of rotation. Using transition region line emission as a proxy for magnetic fields, we will determine the residual magnetic activity levels of Maunder stars, the magnetic contribution to the total energy budget of their outer atmospheres, and explore the relations between Maunder activity levels and stellar mass and rotation. Only HST has the sensitivity to detect or usefully constrain the very weak emission seen in these stars. The results will be used to explore the evolution of dynamos with time, define the dependence of Maunder minimum activity on mass and rotation rate, test non-linear dynamo models, and estimate what solar conditions are like during a Maunder episode.
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