The observation of a bright X-ray source by the Chandra X-ray Observatory's High Energy Transmission Grating Spectrometer (HETGS) can be compromised by photon pile-up in the CCD leading to false absorption features in the observed spectrum. A method for removing the e ects of pile-up in a dispersed grating spectrum is presented. The e ectiveness of the technique is demonstrated through its appl...

We report on our time-resolved CCD photometry during the 2005 June superoutburst of a WZ Sgetype dwarf nova candidate, ASAS 160048-4846.2. The ordinary superhumps underwent a complex evolution during the superoutburst. The superhump amplitude experienced a regrowth, and had two peaks. The superhump period decreased when the superhump amplitude reached to the first maximum, successively graduall...

In this paper the definitions and the properties of a newle dedicated set of highfrequency filters based on smoothing-and-clipping are briefly described. New applications for reduction of wide–field 2048×2048 CCD spectral and direct images of a new deep survey KISS are also presented.

Asteroid (1726) Hoomeister is the lowest{ numbered and probably the largest member of a small, very compact dynamical family. Up to now, the only physical information available on this family consisted of the comparatively low IRAS albedos of Hoomeister and two other family members. After discussing the properties of the family, we report on our own observations of the optical reeectance spectr...

A laboratory experiment has demonstrated the effectiveness of compensating for forced-convection-dominated CW thermal blooming by using a deformable mirror to add phase corrections to the laser beam. In agreement with theoretical predictions, the peak focal-plane irradiance has been increased by a factor of 3 under severely bloomed conditions.

In this paper the multiframe blind deconvolution method 1] for the identiication and correction of turbulence-induced phase aberrations in a ground-based telescope is extended to include the gains, backgrounds, and biases inherent in many charge-coupled device (CCD) cameras. In addition, an application of this method to real telescope data is described.

The CTIO Prime Focus CCD instrument with an RCA CCD was in operation at the CTIO 4-m telescope for six years between 1982-1988. A large body of literature has been published based on CCD images taken with this instrument. We review the general properties of the now-retired PFCCD system to aid astronomers in the interpretation of the photometric data in the literature.

The SLD upgrade CCD vertex detector (VXD3) is described. Its 307 million pixels are assembled from 96 3.2 Mpixel CCDS of 13 cm2 each. The system has evolved from the pioneering CCD vertex detector VXD2, which has operated in SLD since 1992. The CCDS of VXD3 are mounted on beryllium ladders in three cylinders, providing three space point measurements along each track of about 5 microns resolutio...