SS 433在H和K波段的光谱
The Spectrum of SS 433 in the H and K Bands
摘要：
SS~433是一颗X射线双星，也是次相对论性、进动的重子喷流源。我们提出了高分辨率光谱的SS 433在红外H和K波段。光谱主要由氢和氦发射线组成。喷流发射谱线的进动相位仍然用一个恒定的周期来描述，Pjet = 162.375 d。任何长期变化周期的极限是$|\dot P| \lesssim 10^{-5}$。He I 2.0587 μ m谱线具有复杂多变的天鹅座P吸收特征，它是由最大外流速度接近900 km/s的非均匀风产生的。光谱中的He II发射线也出现在这种风中。氢Brackett谱线的较高部分显示出一个双峰剖面，对称的机翼从谱线中心延伸超过+/-1500 km/s。线显示径向速度变化的相位与致密星的径向速度变化的预期，他们显示在盘食，我们解释为旋转失真的失真。我们适合的线轮廓与模型中的排放来自一个对称的表面，开普勒吸积盘周围的紧凑的对象。盘的外缘的速度从110到190公里/秒不等。这些相对较低的速度对致密恒星的质量有一个重要的限制：它的质量必须小于2.2 M_solar，很可能小于1.6 M_solar。
英文摘要：
SS~433 is an X-ray binary and the source of sub-relativistic, precessing, baryonic jets. We present high-resolution spectrograms of SS 433 in the infrared H and K bands. The spectrum is dominated by hydrogen and helium emission lines. The precession phase of the emission lines from the jet continues to be described by a constant period, P_jet= 162.375 d. The limit on any secularly changing period is $|\dot P| \lesssim 10^{-5}$. The He I 2.0587 micron line has complex and variable P Cygni absorption features produced by an inhomogeneous wind with a maximum outflow velocity near 900 km/s. The He II emission lines in the spectrum also arise in this wind. The higher members of the hydrogen Brackett lines show a double-peaked profile with symmetric wings extending more than +/-1500 km/s from the line center. The lines display radial velocity variations in phase with the radial velocity variation expected of the compact star, and they show a distortion during disk eclipse that we interpret as a rotational distortion. We fit the line profiles with a model in which the emission comes from the surface of a symmetric, Keplerian accretion disk around the compact object. The outer edge of the disk has velocities that vary from 110 to 190 km/s. These comparatively low velocities place an important constraint on the mass of the compact star: Its mass must be less than 2.2 M_solar and is probably less than 1.6 M_solar.
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