X-ray nova A0620-00 - Celestial position and low-energy flux
Abstract
The X-ray nova A0620-00 (Nova Monocerotis 1975) has been observed with the SAS-3 satellite. The 1-10 keV intensity was observed to increase by a factor of 2.3 from August 8 to August 11, 1975. It reached and maintained a constant intensity of 1.7 by 10 to the -6 power erg/sq cm/sec from August 11 to August 13. Limits on periodicities of not more than 2 per cent of the power were obtained for periods from 0.2 ms to 435 s. A precise position was obtained with the SAS-3 modulation collimators on August 15. This led directly to optical and radio identifications. Observations with the SAS-3 low-energy concentrator system on August 27 showed an intense 0.4-0.8 keV flux emanating from the nova. A hydrogen column density of 3.5 (plus or minus 0.3) by 10 to the 21st power per sq cm was inferred from these data.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- January 1976
- DOI:
- 10.1086/182006
- Bibcode:
- 1976ApJ...203L...9D
- Keywords:
-
- Novae;
- X Ray Stars;
- Astronomical Models;
- Bremsstrahlung;
- Light Curve;
- Luminous Intensity;
- Satellite Observation;
- Spaceborne Astronomy;
- Stellar Spectra;
- X Ray Spectra;
- Astronomy