Spectroscopy of the bizarre X-ray binary CIR X-1

Details Spectroscopy of the bizarre X-ray binary CIR X-1 Spectroscopy of the bizarre X-ray binary CIR X-1

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.345j&link_type=abstract

Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:

Astronomy and Astrophysics

Astrophysics

Scientific paper

Cir X-1 is one of the most puzzling X-ray binaries known. Like the peculiar systems SS 433 and Cyg X-3, it cannot easily be classified into any of the major categories of X-ray binaries. We present new optical and infrared observations of Cir X-1 taken near periastron. Both sets of spectra show asymmetric emission lines. Archival optical observations show that an asymmetric Hα emission line has been in evidence for the past twenty years, although the shape of the line has changed significantly. We present an eccentric (e ~0.7-0.9) low mass binary model, where the system consists of a neutron star orbiting around a (sub-)giant companion star of 3-5; Modot. We suggest that the broad components of the emission lines arise in a high-velocity, optically thick flow near the neutron star; while the narrow components of the optical and the IR lines arise near the companion star and a heated ejecta-shell surrounding the binary respectively.

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