Upper limits on soft X-ray fluxes from some celestial objects observed by "Salyut 4".
Abstract
Results are reported for a search for soft X-ray emission (0.16-0.28 keV) from the blue supergiant Beta Ori (Rigel), from W Vir and RR Lyr, and from the planetary nebula NGC 6720, which was performed with a grazing-incidence telescope aboard Salyut 4. The following upper limits are placed on the 0.16-0.28-keV X-ray luminosities: 10 to the 32nd erg/s for Beta Ori, 3 x 10 to the 34th erg/s for W Vir, and 2 x 10 to the 32nd erg/s for RR Lyr. An upper limit of 200,000 K is established for the temperature of the nucleus of NGC 6720.
- Publication:
-
X-ray Astronomy
- Pub Date:
- 1979
- Bibcode:
- 1979xras.proc..155B
- Keywords:
-
- Radiant Flux Density;
- Spaceborne Astronomy;
- X Ray Sources;
- X Ray Telescopes;
- Grazing Incidence;
- Grazing Incidence Telescopes;
- Planetary Nebulae;
- Radiation Measurement;
- Salyut Space Station;
- Satellite Observation;
- Astrophysics;
- Cepheids:X Rays;
- Planetary Nebulae:X Rays;
- Supergiants:X Rays