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Using Chandra/LETG Spectra to Probe Stellar Coronae

  • Gaitee A. J. Hussain (a1), Nancy Brickhouse (a2), A. K. Dupree (a2), Adriaan A. van Ballegooijen (a2), Andrew Collier Cameron (a3), Moira Jardine (a3) and Jean-Francois Donati (a4)...

Abstract

We probe the relationship between surface magnetic fields and the X-ray emitting corona in the rapidly rotating star, AB Dor. Circularly polarised spectra have been inverted to produce a surface (photospheric) magnetic field map. This surface map has been extrapolated to model AB Dor's coronal field topology and X-ray light curve. Chandra/LETG light curves of AB Dor from the same epoch show intrinsic variability at the 30% level. Period analysis indicates a fraction of this is due to rotational modulation. We measure velocity shifts in emission line centroids as a function of Prot and find evidence of rotational modulation (max. vel. ∼ 40 ± 13km s—1). This modulation may indicate the presence of a localised X-ray emitting region at mid-to-high latitudes.

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References

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