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arxiv: 1012.4351 · v1 · pith:674P24IEnew · submitted 2010-12-20 · 🌌 astro-ph.GA · astro-ph.HE

New Optical Results on gamma-ray Binaries

J. Casares , J.M. Corral-Santana , A. Herrero , J.C. Morales , T. Mu\~noz-Darias , I. Negueruela , J.M. Paredes , I. Ribas
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M. Rib\'o D. Steeghs L. van Spaandonk F. Vilardell
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keywords opticalbinarygamma-rayperiodresultsamplitudebinariescampaign
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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.

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