Site menu:

Latest news:

Jan 16, 2014
Workshop 2014 announced

Read more »

Jan 16, 2014
Lecture series announced

Read more »

Jan 16, 2014
Presentation skills seminar announced

Read more »

Jan 16, 2014
Voice training seminar announced

Read more »

Zur deutschen Version

Contact etc.:

Search this site:

Links:

Image of B. Voigt

B. Voigt

Research: Surface spots on cool giant stars probed by spectro-astrometry

Spectro-astrometry is a technique to obtain information about the structure of an astronomical source on sub-diffraction limited spatial scales down to milli- or micro-arcseconds. The method exploits the shift of the photocentre of a structured source over emission/absorption lines in its spectral energy distribution. Sub-diffraction limited resolution can be achieved because the method only uses wavelength-differential information of longslit spectra.The aim of this work was to analyse the potential of the method, develop the tools to exploit this potential and write the software which is needed to perform the analysis procedure. To verify the practical feasibility, observations were done with the VLT/CRIRES facility to demonstrate the capabilities of the method with respect to detecting structures on giant star surfaces.