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| Paper: |
Probing the Inner Disk and Magnetosphere of KH 15D |
| Volume: |
448, 16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun |
| Page: |
647 |
| Authors: |
Hamilton, C. M.; Johns-Krull, C. M.; Mundt, R.; Herbst, W.; Winn, J. N. |
| Abstract: |
The pre-main sequence binary system KH 15D offers a unique opportunity
to probe the magnetosphere of a young solar-like star by virtue of the regular
occultation of the star as it moves in its orbit relative to a warped circumbinary disk.
We have obtained high-resolution spectra of this system
while the star is fully visible, fully occulted, and during several ingress and egress
events over the course of five contiguous observing seasons.
We see dramatic changes in the Hα profiles as the star changes its position with
respect to the occulting edge, as well as evidence for enhanced accretion following
periastron passage. We use these time series data to map out the size of the
magnetosphere and find that it changes size dramatically from one observing season
to the next, if not on a more rapid timescale. |
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