Soft X rays from Sirius
Abstract
ON April 3, 4 and 5, 1975 the star Sirius (α CMa) was observed with the soft X-ray detector aboard the Astronomical Netherlands Satellite (ANS). The instrument consists of a parabolic collecting mirror which has at its focus a proportional counter with a 3.6-µm polypropylene window. It responds to X rays in the photon energy range 0.284-~ 0.2 keV. The projected area is 144 cm2 which, allowing for reflectivity, counter efficiency and so on, leads to a sensitive area of about 25 cm2 at the carbon absorption edge (0.284 keV). The field of view is 34' FWHM circular. Further instrumental details are given in refs 1ndash;3.
- Publication:
-
Nature
- Pub Date:
- August 1975
- DOI:
- 10.1038/256711a0
- Bibcode:
- 1975Natur.256..711M
- Keywords:
-
- Proportional Counters;
- Spaceborne Astronomy;
- Stellar Radiation;
- X Ray Sources;
- Astronomical Netherlands Satellite;
- Line Spectra;
- Radiant Flux Density;
- Radiation Counters;
- Statistical Correlation;
- Ultraviolet Radiation;
- X Ray Spectra;
- Astrophysics