Other
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21341411h&link_type=abstract
American Astronomical Society, AAS Meeting #213, #414.11; Bulletin of the American Astronomical Society, Vol. 41, p.225
Other
Scientific paper
It has long been known that pre-main sequence stars exhibit regions of magnetic activity on their surfaces similar to ones observed on the Sun. However the extent to which these regions cover the stellar surfaces is not yet well understood. Most spectral classification methods rely on moderate-resolution optical spectra whose features arise primarily from the non-active, hotter photosphere. Effective temperatures derived using these spectral types may then be overestimated if a large portion of the surface is covered in active regions, leading to substantial errors in mass and age calculations.
This work presents a novel approach which aims to overcome the limitations of other observing techniques (e.g. Doppler imaging) in quantifying the distribution of magnetic regions on a large sample of active stars. Utilising simultaneous optical spectroscopic and photometric observations of a significant sample of fast rotation T Tauri stars and simple computer simulations, we demonstrate that these young stars have upwards of 50% of their surfaces covered with active magnetic regions.
Casali Mark M.
Hastie Morag Ann
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