The following document lists the file abstract/PHT_CAL_CFREP305.abs
from catalogue VI/111.
A plain copy of the file
(without headers/trailers) may be downloaded.
The following program is carried out in order to consolidate the PHT calibration of chopped measurements and derive signal losses due to the high chopper frequency compared to signal stabilization time. - observation of standard calibration stars: background and star staring plus chopped measurements. We intend to use well known calibration stars with a consolidated spectral energy distribution. The star is sufficiently bright to be used as a standard at wavelengths longward of 60 micron. Several filters are taken to have several contrast levels between background and source. A second set of measurements is taken using shorter reset interval, in order to increase the chopper frequency. To do this we have to increase the fluxes to the double of its value. .HISTORY 23/06/97 JA First version. Standard star is HR5340 26/08/97 JA Standard star is HR6705 27/10/97 JA Standard star is HR7980 using detector P3 .OTT .TDT