Optical emission from the high inclination X ray transient EXO 0748-676

Details Optical emission from the high inclination X ray transient EXO 0748-676 Optical emission from the high inclination X ray transient EXO 0748-676

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..545m&link_type=abstract

In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 1: X Ray Binaries p 545-549 (SEE N90-25711 19-89)

Astronomy and Astrophysics

Astronomy

4

Emission, Extremely High Frequencies, Light Curve, X Rays, X-Y Plotters, Brightness, Bursts, Emission Spectra, Emissivity, Photometry, Spectral Resolution, X Ray Spectra

Scientific paper

The analytical of optical charged coupled device and high time resolution photoelectric photometry of EXO 0748-676 are presented. They were collected from Feb. 1985 until Mar. 1987 at the European Southern Observatory. During the 1985 Feb. to Mar. decay from outburst, the V band flux near light curve maximum at phase 0.5 was positively correlated with the 1 to 20 keV flux measured by EXOSAT. Since its discovery the optical counterpart oscillated several times between low and high optical states which are the clear equivalent states identified in X-rays. In 1985 the optical photometric light curve exhibits shape variations which are correlated with the mean optical/X-ray flux and with X-ray dip activity. The interpretation of the optical light curve is discussed and present observational evidences revealing the effects of high systemic inclination on X-ray persistent, burst and optical emissivity.

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