gamma-ray双星的新光学结果
New Optical Results on gamma-ray Binaries
摘要:
我们提出了新的伽玛射线双星LS 5039的光谱学。我们的数据表明,在径向速度的亚轨道调制的振幅~7公里/秒和周期~Porb/4的证据。这种短期振荡至少在7年内是稳定的,它可能是由O6.5V光学恒星的非径向振荡触发的。我们还介绍了MWC 148,新的伽马射线二进制候选人HESS J 0632 +067的光学对应物的光谱运动的结果。可以清楚地探测到H α和H β发射线参数的长期变化,如果用双星轨道进行调制,这意味着周期大于200天。
英文摘要:
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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