Computer Science
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1010..330c&link_type=abstract
A POPULATION EXPLOSION: The Nature & Evolution of X-ray Binaries in Diverse Environments. AIP Conference Proceedings, Volume 10
Computer Science
X-Ray Binaries, Galactic Nuclei, Circumnuclear Matter, And Bulges, Galactic Center, Bar, Circumnuclear Matter, And Bulge, Star Formation
Scientific paper
NGC 300 X-1 and IC 10 X-1 have recently been identified in nearby galaxies as extragalactic examples of the rare class of Wolf-Rayet/compact object X-ray binary system uniquely exemplified in the Galaxy by Cyg X-3. Using Swift TOO observations of NGC 300 X-1 and IC 10 X-1, we recently discovered very similar periods of 32.8+/-0.4 and 34.8+/-0.9 hours, respectively. We believe that these are likely to be orbital periods. It seems surprising that these are so similar and large compared to the short 4.8 hour period of Cyg X-3, suggesting different evolutionary paths. For both extragalactic candidates we show the allowed ranges of component masses and Wolf-Rayet star wind velocities for which accretion disks could form around the black holes.
Carpano S.
Crowther P. P.
Ehle Matthias
Kilgard Roy
Pollock Andy M. T.
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