OH／IR星的绝对K星等与距离

The Absolute K Magnitude and the Distance of OH / IR Stars

本文计算了一批ＯＨ／ＩＲ星的绝对Ｋ星等Ｍｋ，对ＯＨ／ＩＲ星的Ｍｋ和距离ｄ作了讨论。发现当Ｋ较亮时，Ｍｋ为一常数；当Ｋ较暗时，Ｍｋ较离散且呈现一定的变化趋势。本文还拟合得到了一个由Ｋ星等求距离的经验公式，并由此公式计算了一批ＯＨ／ＩＲ星的距离。最后，对所得结果进行了解释和讨论。

The absolute K magnitudes and the distances of some OH / IR stars are calculated and discussed in this paper. It is found that the absolute K magnitude is almost constant for the OH / IR stars with the bright apparent K magnitude (K < 4.0), but the absolute K magnitude is dispersed and dimmer for the OH / IR stars with K> 4.0. The dimmer and dispersed absolute K magnitudes may be caused by the thicker circumstaller dust shells of these stars. The relation between the apparent K magnitude and the distance for the OH / IR stars with K < 4.0 is also given, so that the distances of the OH / IR stars with K < 4.0 can be estimated form the apparent K magnitude, and the problem of the correction of interstallar reddening of these stars is also solved.