The Orbits of the Gamma-ray Binaries LS I +61 303 and LS 5039

Details The Orbits of the Gamma-ray Binaries LS I +61 303 and LS 5039 The Orbits of the Gamma-ray Binaries LS I +61 303 and LS 5039

2009-02-23

arxiv.org/abs/0902.4015v3

Astrophys.J.698:514-518,2009

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

Accepted to ApJ, 13 pages, preprint2 style

Scientific paper

10.1088/0004-637X/698/1/514

LS I +61 303 and LS 5039 are two of only a handful of known high mass X-ray binaries (HMXBs) that exhibit very high energy emission in the MeV-TeV range, and these "gamma-ray binaries" are of renewed interest due to the recent launch of the Fermi Gamma-ray Space Telescope. Here we present new radial velocities of both systems based on recent red and blue optical spectra. Both systems have somewhat discrepant orbital solutions available in the literature, and our new measurements result in improved orbital elements and resolve the disagreements. The improved geometry of each orbit will aid in studies of the high energy emission region near each source.

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