The following document lists the file abstract/PHT_CAL_CFRE_CK2.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 alpha Boo (Arcturus, HR 5340): background and star staring plus chopped measurements. This is a well known calibration star with a consolidated spectral energy distribution. The star is sufficiently bright to be used as a standard at wavelengths longward of 60 micron. Since the star is very bright at the shorter wavelengths background observations are taken only for filters longward of 60 micron. Several filter are taken to have several contrast levels between background and source. .HISTORY 23/06/97 JA First version .OTT .TDT