We propose to use as large a network of optical spectrographs and photometric devices worldwide as possible. We want to secure continuous coverage (i.e. repeated observations several times each clear night at each of many sites):
For spectroscopic variability of mainly the
Analysis of these spectral variations will allow us to determine reliable statistical properties of the clumps, in search of expected power-law turbulent cascading, while also revealing any other trends, coherent or not. It will also allow us to verify the stability of CIRs during many rotations. It is best to keep the same grating setup (for a given telescope) for each star during the whole run. Echelle spectrographs are highly interesting for us. We could examine many different spectral lines simultaneously at high spectral resolution with Echelles.
A telluric standard star nearby in the sky should also be observed occasionally in order to be able to subtract out these nuisance terrestrial atmospheric features in the stellar spectra. We also need observations of a star with a relatively flat spectrum (like a sub-dwarf or other) to correct for any instrumental effect (if possible for a given observer).
Parallel photometric broadband variability to find respective luminosity variations of the whole systems would also be desirable at the milli-mag precision level for both stars, in order to constrain the continuum level of the variations. We ask for highest possible accuracy up to the milli-mag level.