Asteroseismology of evolved compact stars at CFHT - A proposition for a new instrumentation to study phenomena at high temporal resolution.
S. Charpinet &, G. Fontaine

Abstract: The role of the CFHT, used thus far with the Montreal visitor instrument , LAPOUNE, has been essential for the development of precise asteroseismology , of evolved compact stars (ie, pulsating white dwarf and extreme horizontal , branch stars). Thanks to its yet unequalled performances, the CFHT has most , recently permitted the probing of the inner structure and the determination of , the fundamental structural parameters for a handful of rapidly pulsating subdwarf B stars, thus demonstrating the very strong potential of asteroseismology applied to these stars and opening new opportunities for future studies. I will summarize the recent achievements that the CFHT permitted in this particular domain and I will show what now lies ahead of us. Success for the future developments envisionned will still clearly rely on the CFHT., , , For the longer term, and going beyond asteroseismology, we also propose to , develop at CFHT an efficient intrumentation to study phenomena that requires , high temporal resolution (for variabilities from milliseconds to seconds; a , still relatively unexplored domain of the observational parameter space). This , instrument would be inspired from the very successful high speed UK camera , ULTRACAM and would feature very short exposures capabilities with negligible , dead-times, multiple channels (3 or more) covering a wide wavelength range , for simultaneous measurements at different wavelength bands, imaging , capabilities, and high efficiency. Such a versatile instrument would cover , science areas as diverse as asteroseismology of evolved compact stars, , eclipse of binary stars, eclipse mapping, flickering and oscillations in , accretion disks, echo mapping, precise timing studies, high speed , resolution of planet transits, shift-and-add imaging, speckle imaging, , neutron star and black-hole binaries, occultations, and so on.