OH质量AGB星的相位滞后距离
Phase-lag Distances of OH Masing AGB Stars
摘要：
与具有光学厚壳层的AGB星的距离不能用光学视差来确定。然而，对于从拱壳发出OH 1612 MHz脉泽的恒星，距离可以用相位滞后法确定。该方法将从相位滞后测量获得的线性直径与从干涉测量获得的角直径相结合。本文测定了银盘中20颗OH/IR星的壳层前后面可变辐射的相位滞后。这些测量是基于南凯射电望远镜持续6年多的监测计划。干涉仪观测仍在继续。我们估计，距离测定的不确定性将为~ 20%。
英文摘要：
Distances to AGB stars with optically thick circumstellar shells cannot be determined using optical parallaxes. However, for stars with OH 1612 MHz maser emission emanating from their circumstellar shells, distances can be determined by the phase-lag method. This method combines a linear diameter obtained from a phase-lag measurement with an angular diameter obtained from interferometry. The phase-lag of the variable emission from the back and front sides of the shells has been determined for 20 OH/IR stars in the galactic disk. These measurements are based on a monitoring program with the Nancay radio telescope ongoing for more than 6 years. The interferometric observations are continuing. We estimate that the uncertainties of the distance determination will be ~20%.
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