Astronomy and Astrophysics – Astronomy
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1010...97s&link_type=abstract
A POPULATION EXPLOSION: The Nature & Evolution of X-ray Binaries in Diverse Environments. AIP Conference Proceedings, Volume 10
Astronomy and Astrophysics
Astronomy
X-Ray Binaries, X-Ray Sources, X-Ray Bursts, Neutron Stars
Scientific paper
Since its discovery in 1976 the X-ray binary hosting Circinus X-l has repeatedly surprised researchers with its unorthodox behavior as an X-ray source. It is currently viewed as an accreting neutron star binary in a highly eccentric 16.6 day orbit around a likely intermediate mass companion star connecting to the Roche lobe near periastron only. It has since gained a reputation as an oddball in the zoo of Galactic X-ray binaries. Its 30 yr light curve shows short-term and long-term variability. The short-term variability is related to its orbital periastron passage, the long-term implies a transient-like pattern where the X-ray flux in- and decreases over time periods of 5-10 yr. High resolution spectral observations with Chandra have shed considerable light on the reasons for this pattern and recent conclusions may prove quite revealing in our understanding of accretion processes.
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