Infrared photometry of the X-ray binary 2A 1822-371 : a model for theultraviolet optical, and infrared light curve.
Abstract
The X-ray source 2A 1822-371 may be prototypical of a class of accreting close binary systems in which the X-ray emission is diffused by a cloud of ionized material which is associated with the accretion disk. The present investigation provides a report on infrared photometry of 2A 1822-371 in the J (1.25 micrometer), H (1.65 micrometer), and K (2.2 micrometer) bands. A complete 5.57 hr light curve has been obtained at J which makes it possible to extend the investigations of the energy dependence of the ultraviolet and optical curve begun by Mason and Cordova (1982). The work conducted by White and Holt (1982) is extended to the long wavelength light curve by incorporating the influence of emission from the inner and outer rim of the disk and from the companion star. Including such effects, and assuming that reprocessed X rays are the major source of light at wavelengths greater than 1100 A, it is found possible to reproduce the morphology and energy dependence which is observed in the light curve of 2A 1822-371 from the far-ultraviolet to the near-infrared.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 1982
- DOI:
- 10.1086/160416
- Bibcode:
- 1982ApJ...262..253M
- Keywords:
-
- Binary Stars;
- Infrared Astronomy;
- Infrared Photometry;
- Light Curve;
- Stellar Models;
- Stellar Spectrophotometry;
- Ultraviolet Spectra;
- Visible Spectrum;
- X Ray Sources;
- Emission Spectra;
- Far Ultraviolet Radiation;
- Near Infrared Radiation;
- Optical Emission Spectroscopy;
- Spectral Bands;
- Stellar Mass Accretion;
- Astrophysics