Using FeH Lines near 1 Micron to Explore Magnetic Fields in Fully Convective Stars

Details Using FeH Lines near 1 Micron to Explore Magnetic Fields in Fully Convective Stars Using FeH Lines near 1 Micron to Explore Magnetic Fields in Fully Convective Stars

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..419v&link_type=abstract

NOAO Proposal ID #1999A-0419

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Scientific paper

We will demonstrate that individual FeH lines near 1 (micron) are a powerful new probe of magnetic fields on very cool stars (M, L, and brown dwarfs). Traditional atomic diagnostics are no longer present in the spectrum beyond M5V. FeH lines have a wide range of Zeeman sensitivities for otherwise similar line formation characteristics, making them ideal diagnostics. Many individual lines can be resolved, and they are relatively untainted by telluric absorption. The very red wavelength (9900 Å) gives excellent Zeeman sensitivity, but total exposure times of 1-2 hours are required to compensate for poor CCD quantum efficiency. Developing the ability to measure magnetic fields using FeH lines will enable future studies of dynamos, flares, coronal heating, and angular momentum loss in fully convective stars and brown dwarfs.

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