New Optical Results on gamma-ray Binaries

Bibcode
2011heep.conf..559C
DOI
10.1007/978-3-642-17251-9_46
Casares, J.; Corral-Santana, J. M.; Herrero, A.; Morales, J. C.; Muñoz-Darias, T.; Negueruela, I.; Paredes, J. M.; Ribas, I.; Ribó, M.; Steeghs, D.; van Spaandonk, L.; Vilardell, F.
Bibliographical reference

High-Energy Emission from Pulsars and their Systems, Astrophysics and Space Science Proceedings, ISBN 978-3-642-17250-2. Springer-Verlag Berlin Heidelberg, 2011, p. 599-562

Advertised on:
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2011
Number of authors
12
IAC number of authors
0
Citations
0
Refereed citations
0
Description
We present new optical spectroscopy of the γ-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 γ-ray binary candidate HESS J0632+067. Long-term variations in the Hα and Hβ emission line parameters are clearly detected which, if modulated with the binary orbit, would imply a period >200 days.
Type
Non-refereed

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