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Paper detail

New Optical Results on gamma-ray Binaries

We present new optical spectroscopy of the gamma-ray binary LS 5039. Our data show evidence for sub-orbital modulation in the radial velocities with amplitude ~7 km/s and period ~Porb/4. This short-term oscillation is stable over at least 7 years and it is likely triggered by non-radial oscillations of the O6.5V optical star. We also present the results of a spectroscopic campaign on MWC 148, the optical counterpart of the new gamma-ray binary candidate HESS J0632+067. Long-term variations in the Halpha and Hbeta emission line parameters are clearly detected which, if modulated with the binary orbit, would imply a period >200 days.

preprint2010arXivOpen access
J. CasaresJ. M. Corral-SantanaA. HerreroJ. C. MoralesT. Muñoz-DariasI. NegueruelaJ. M. ParedesI. RibasM. RibóD. SteeghsL. van SpaandonkF. Vilardell
astro-ph.GAastro-ph.HE
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J. CasaresJ. M. Corral-SantanaA. HerreroJ. C. MoralesT. Muñoz-DariasI. NegueruelaJ. M. ParedesI. RibasM. RibóD. SteeghsL. van SpaandonkF. Vilardell

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