Probing the Chromospheres of M dwarfs with the IRS

Details Probing the Chromospheres of M dwarfs with the IRS Probing the Chromospheres of M dwarfs with the IRS

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20409c&link_type=abstract

Spitzer Proposal ID #20409

Physics

Scientific paper

Arguable the most effective wavelength region to probe the coolest, outer layers of M dwarf atmospheres is to use mid-infrared spectrophotometry. Here the continuum opacity is very small, though if the atmosphere is not heated from below, the opacity due to water will be very strong. However, if there is any temperature increase above the minimum temperature layer due to a chromosphere or just weak acoustic heating, the water opacity weakens greatly, and a substantial increase in mid-infrared flux is predicted by models. This enhancement would be expected to increase sharply with increasing wavelength, reaching perhaps a 50% difference at 30 microns, and exceeding 60% at 36 microns. We thus propose to observe a set of eleven M1-M6 dwarfs, with and without quiescent H alpha emission. Most of the latter have old disk / halo space velocities. The observations should test the level of "basal" chromospheric-like activity for old stars that should have at most, weak, spun-down dynamos.

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