论文标题
从径向速度监测中发现一个中子星候选者
Discovery of one neutron star candidate from radial velocity monitoring
论文作者
论文摘要
我们通过使用LAMOST低分辨率的光谱数据报告了一个可能的中子星二进制二进制（$ p _ {\ rm orb} = $ 0.8666天）的发现。 The visible companion is a late A-type dwarf ($T_{\rm eff} = 7900 \pm 200$ K; log$g$ $=$ 4.3$\pm$0.2; $M =$ 1.7$\pm$0.1 M$_{\odot}$; $R\ =\ 1.7\pm0.2$ R$_{\odot}$), at距离1.11 $ \ pm0.03 $ kpc。从GTC/Horus高分辨率光谱中看不到双线特征，因此径向速度变化表明隐藏在二进制中的物体。系统的光曲线显示出明显的椭圆形变异性，表明可见的伴侣潮汐变形。通过将多波段光曲线与ELC和WD代码拟合，我们将无形星的质量限制为1.1---1.3 m $ _ {\ odot} $。光谱散开没有显示具有光吸收光谱的其他组件，支持该系统包含一个紧凑的对象。在ROSAT档案观测中未检测到X射线或紫外线发射。因此，我们怀疑看不见的物体更可能是中子恒星，而不是白色矮人。我们的发现表明，Lamost光谱调查发现X射线静止的紧凑物体的能力。
We report the discovery of one possible neutron star binary ($P_{\rm orb} =$ 0.8666 day) by using the LAMOST low-resolution spectroscopic data. The visible companion is a late A-type dwarf ($T_{\rm eff} = 7900 \pm 200$ K; log$g$ $=$ 4.3$\pm$0.2; $M =$ 1.7$\pm$0.1 M$_{\odot}$; $R\ =\ 1.7\pm0.2$ R$_{\odot}$), at a distance of 1.11$\pm0.03$ kpc. No double-lined feature can be seen from the GTC/HORuS high-resolution spectra, thus the radial velocity variation indicates an invisible object hiding in the binary. The system's optical light curves show clear ellipsoidal variability, suggesting that the visible companion is tidal distorted. By fitting the multi-band light curves with the ELC and WD codes, we constrain the mass of the invisible star to be 1.1--1.3 M$_{\odot}$. Spectral disentangling shows no additional component with optical absorption spectra, supporting the system contains one compact object. No X-ray or UV emission are detected in the ROSAT archive observations. Therefore, we suspect the invisible object is more likely a neutron star rather than a white dwarf. Our finding suggests the ability of LAMOST spectroscopic survey to discover X-ray quiescent compact objects.
