Next: How the Data Up: CCD Reductions Previous: Combine Example . Having obtained some background, let us now start to process the input frames according to the scheme in Section . As indicated in that section the reduction sequence is, in a simplified version the calibration of science frames consists of the following steps: . determine overscan correction and trim area; . preparing calibration frames; . ... Overscan correction and trimming . ... Tue Mar 28 16:52:29 MET DST 1995 ...

Radio Interferometry Principles . Radio Interferometry Signal Processing . ... A radio interferometer consists of a pair of directional antennas that are tuned to receive radio emissions from a source in a desired RF band. ... The antennas are pointed at the radio source of interest and are set up to receive the signal and process it into a form suitable for transmission to the correlator. ... In connected element interferometry, the digital signal goes directly to the correlator. ...

... Perform basic two-dimensional image reduction. Reject cosmic rays from CCD data. Process the contemporaneously obtained wavecal data to obtain the zeropoint shifts in the spectral and spatial directions. ... Subtract science image from wavecal . ... For each image in the science file, this task selects the wavecal in the wavecal file that is closest in time to the science image, and it copies the keyword values for the spectral shift from that wavecal header to the science header. calstis12 . ...

... The choice of the spectrograph design (Fig.2) is determined by the quantity R, the overall dimensions of the PF cage and the restrictions on the rigidity of the structure of the device. ... As the camera's objective a fast 4-lens aplanat is used having a focal distance F cam =140 mm and a relative aperture of 1:1.8, the resolution at the centre is no less than 80 gr/mm, that over the field at a distance of 3 mm from the edge along the frame ( ) diagonal is 35 gr/mm. ...

Next: Rev0, MPE-Processed Data Up: DETAILED LIST OF ROSAT Previous: DETAILED LIST OF ROSAT . Prior to June 1994 data processed in the U.S. were supplied in the following files: . ... rp<seq#>.fits . Photon events, data quality, and good time intervals (binary table) . ... Compressed image for display -- total energy band . ... Compressed image for display -- hard energy band . ... Compressed image for display -- soft energy band . ... Selected source spectra (ascii table) . ... Aspect files . ...

Next: Summary of Imaging Strategies Up: Primary Beams and Mosaicing Previous: Mosaicing Observing Strategies . ... Splitting: As with conventional reduction, for calibration and imaging purposes, it is easiest in Miriad to split the data into datasets containing a `single source' and single frequency band. ... vis=mosaic.uv . ... Data Selection: With mosaic visibility datasets, the select=ra and select=dec selection sub-commands can be useful to extract or manipulate a subset of the visibility data. ...

... The SAS_ODF environment variable shall be set to the summary file produced by odfingest , or to a directory containing the data, and access to calibration files shall be set through cifbuild . ... In order to process a single exposure containing fast mode data as . ... Note that tracking data may not be good enough, in which case no plot is produced. omdrifthist set =/path_to_your_data/fast/tmp_tracking plotfile =/path_to_your_data/fast/P0125321001OMS002TSHPLT0000.PS trackradius =0.5 hardcopy =yes ....

... This paper describes the main algorithms used by the Einstein Level One processing to create the exposure masks and the background maps for Einstein IPC images, and how these algorithms were recreated in the IRAF environment. Our goal was to recreate the algorithms used by the Level One Processing to create exposure masks and background maps for Einstein Image Proportional Counter (IPC) data (cf. sections 2.5 and 2.7 of Harnden et al. ...

... CREATED are counted): we count executed AND created ABs, to include the science associations . ... number and size of raw and product CALIB files (if from executed ABs) . number of ABs (created and executed) . ... Raw files: Number of raw frames are extracted from executed ABs which effectively means that only raw frames are counted which have been processed. ... Every raw SCIENCE frame from RAWFILE section in an executed AB is counted (before 2011-10-01: every associated and packed raw file) . ...

... Stellar Evolution is driven entirely by the never ending battle between Pressure and Gravity . As imbalances are reached, the star is driven to find a new Energy source. ... Pressure and gravitational forces are equal, the star is stable and its core is sufficiently hot to fuse Hydrogen into Helium More about main sequence stars . ... The luminosity generated by the core fusion of Helium into Carbon is far greater than the shell luminosity associated with the fusion of Hydrogen into Helium. ...