Computer Science
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1010..298g&link_type=abstract
A POPULATION EXPLOSION: The Nature & Evolution of X-ray Binaries in Diverse Environments. AIP Conference Proceedings, Volume 10
Computer Science
Origin, Formation, Evolution, Age, And Star Formation, X-Ray Binaries, Stellar Clusters And Associations
Scientific paper
Our neighbouring galaxy M31 (Andromeda), located 780 kpc away, offers a unique opportunity to study the X-ray population of a galaxy similar to the Milky Way. We have concentrated our monitoring campaign on following the X-ray activity of the stellar-mass black hole candidates, XRNe (X-Ray Novae), in the central region of M31. Observations are made approximately once a month with Chandra, following up any bright outbursts with HST in order to identify the optical counterparts. Having measurements of the X-ray and optical luminosities, both in outburst and quiescence, allows for the estimation of a system's orbital period. In this way we have now calculated or constrained this important parameter for 6 systems, and will have a further 6 by the end of the current Chandra cycle. With 12 orbital periods known, it will be possible to compare these values to those of the X-ray binary population in our own galaxy.
Galache José Luis
Garcia Mike R.
Murray Stephen S.
Steeghs Danny
Torres Manuel P.
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