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| Paper: |
Chromospheric Activity in Cool Stars: Open Questions |
| Volume: |
472, New Quests in Stellar Astrophysics III: A Panchromatic View of Solar-like Stars, With and Without Planets |
| Page: |
225 |
| Authors: |
Schröder, K.-P.; Schmitt, J. H. M. M. |
| Abstract: |
Despite a wealth of observational insight into chromospheric physics
obtained in the past decades, a number of fundamental questions remain
to be answered. On some of them we seem to make progress, others are
motivation for ongoing research: is there a well-defined “zero-point”
of magnetic stellar activity, and by which heating processes is the
basal chromospheric flux created? Or: how did the Sun
look like during the Maunder Minimum, and when is the next one due?
And are activity cycles of cool giants caused by a solar-type dynamo,
despite a very different internal structure? What makes magnetic
stellar activity be still (or again?) at work in such very evolved stars
- should not all angular momentum have been consumed?
To find some answers, the Hamburg Robotic Telescope, equipped with a
high-resolution (20,000) spectrograph, will start regular operation
at its final site in Guanajuato, central Mexico, this year (2012),
in part to resume the legendary Mt. Wilson stellar activity
monitoring project. |
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