Spectroscopic and Photometric Variability of CYGNUS-X-3

Details Spectroscopic and Photometric Variability of CYGNUS-X-3 Spectroscopic and Photometric Variability of CYGNUS-X-3

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...276l...9v&link_type=abstract

Astronomy and Astrophysics, Vol.276, NO. 1/SEPI, P. L9, 1993

Astronomy and Astrophysics

Astrophysics

58

Binaries: Close - Stars: Individual: Cygnus X-3 - Stars: Wolf-Rayet - X-Rays: Stars

Scientific paper

I present orbital-phase resolved K-band spectra of Cyg X-3. These show emission lines that shift in wavelength during the orbit, with maximum blueshift coinciding with X-ray and infrared minimum, and maximum redshift half an orbit later. I propose that this is due to the fact that during the observations the wind of the helium star was almost completely ionized by the X-ray source, except for the part shadowed by the helium star. With this hypothesis one can also understand the orbital modulation of the infrared continuum flux, as well as the fact that it is modulated in phase with the X-ray flux. I present numerical calculations on a simple model for the source, and show that for reasonable parameters it is possible to reproduce the observed spectroscopic and photometric orbital modulation.

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