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| Paper: |
Chandra Reveals Variability and Sub-arcsecond Spatial Structure
in the X-ray Emission from FU Orionis |
| Volume: |
448, 16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun |
| Page: |
1039 |
| Authors: |
Skinner, S. L.; Güdel, M.; Briggs, K.; Lamzin, S. A. |
| Abstract: |
We present results of a sensitive (99 ks) Chandra ACIS-S
observation of the rapidly-accreting young star FU Ori.
Chandra confirms the unusual two-component spectrum
revealed previously by XMM-Newton. Chandra's
higher angular resolution shows that the heavily-absorbed hot
component is coincident with FU Ori and is variable. Such
emission is a signature of a magnetically-active coronal source
and supports the previous report of a magnetic field in FU Ori.
In contrast, the soft lower absorption emission below 2 keV
peaks 0.2 arcsec to the SE of FU Ori toward the faint
near-IR companion FU Ori S. The companion lies 0.49 arcsec SE
of FU Ori and is probably a young K-type star. The companion is
likely an X-ray source and contributes significantly to the
detected emission below 2 keV (and weakly above 2 keV).
The presence of two closely-spaced sources explains the
unusual two-component X-ray spectrum. |
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