Computer Science
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9464s&link_type=abstract
HST Proposal ID #9464
Computer Science
Hst Proposal Id #9464
Scientific paper
Recent observations cast doubt on the importance of acoustic waves for chromospheric heating in stars. These include low upper limits to their contribution to upper layers of the solar chromosphere, and evidence for significant magnetic heating contribution even in ``basal" activity stars. These findings contradict the widely accepted picture that acoustic heating accounts for a significant fraction, the ``basal component'', of chromospheric heating in inactive stars. To help resolve this issue, we propose to observe two very inactive stars with significantly different properties to search for specific signatures of upward propagating acoustic waves: blue-shifts and enhanced blue wings in chromospheric lines. Solar data show that the degree of blue-shift can be used to estimate the acoustic contribution to chromospheric heating. We will compare the data to HST spectra of similar stars, and solar spectra from the SUMER instrument on SOHO. Lack of a significant acoustic signature in our targets would indicate that magnetic heating generated by a local {turbulent, non-cycling} dynamo is responsible for the basal component of chromospheric heating in inactive stars. Our targets may be in a phase analogous to the solar Maunder minimum, and the HST spectra might serve as a proxy for the solar spectrum in this state. The spectra will also be used for emission measure analysis differentially between the Sun and solar-like stars.
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