Application of fast CCD drift scanning to speckle imaging of binary stars

摘要

A new application of a fast CCD drift scanning technique that allows us toperform speckle imaging of binary stars is presented. For each observation, anarbitrary number of speckle frames is periodically stored on a computer disk,each with an appropriate exposure time given both atmospheric and instrumentalconsiderations. The CCD charge is shifted towards the serial register and readout sufficiently rapidly to avoid an excessive amount of interframe dead time.Four well-known binary systems (ADS 755, ADS 2616, ADS 3711 and ADS 16836) areobserved in to show the feasibility of the proposed technique. Bispectral data analysis and power spectrum fitting is carried out for eachobservation, yielding relative astrometry and photometry. A new approach forself-calibrating this analysis is also presented and validated. The proposed scheme does not require any additional electronic or opticalhardware, so it should allow most small professional observatories and advancedamateurs to enjoy the benefits of diffraction-limited imaging.