OCA, FRESNEL, / Departement d'Astrophysique de l'UNSA
UMR Astrophysique, Universite de Nice-Sophia Antipolis, Parc Valrose
PNPS- ASHRA-
F-06108 Nice CEDEX 2
Nice, France
Presentation 1 : Oral
Interferometric-Doppler Imaging of stellar surface structure
Jankov, S., Vakili, F., Domiciano de Souza, A.
We show the imaging potential of a tomographic technique
which combines time-resolved spectroscopy and long baseline
differential interferometry, providing informations that cannot
be obtained otherwise with each of these techniques taken at
once. Although the technique is applicable to other classes of
stellar surface imaging (temperature spots, magnetic field)
we consider particularly the examples of brightness distribution
due to non-radial stellar pulsations and abundance inhomogeneities.
We present the numerical experiments with realistic spectral
resolutions and a desired signal-to-noise ratios of less than a
thousand expected for operating (the GI2T) or close-to-operating
long baseline interferometers (the VLTI). We show that the accurate
maps of stellar surfaces can be obtained using regularized inversion
by Maximum Entropy method.