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New Optical Results on gamma-ray Binaries

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arxiv 1012.4351 v1 pith:674P24IE submitted 2010-12-20 astro-ph.GA astro-ph.HE

J. Casares , J.M. Corral-Santana , A. Herrero , J.C. Morales , T. Muñoz-Darias , I. Negueruela , J.M. Paredes , I. Ribas
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M. Ribó D. Steeghs L. van Spaandonk F. Vilardell
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classification astro-ph.GAastro-ph.HE
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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  1. Further evidence for natal kick segregation by spectral type in high-mass X-ray binaries

    astro-ph.HE 2025-09 conditional novelty 5.0 of 10

    High-mass X-ray binaries with Be companions predominantly move slower than 40 km/s, while those with supergiant companions predominantly move faster, a statistically robust separation likely reflecting different natal kicks.

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