Abstract

The results of the spectral and photometric studies of two Be/X-ray binaries, 1H1936+541 and 1H2202+501, are presented. The spectral class of the optical component of the 1H1936+541 system was determined for the first time, and the spectral class of the optical component of the 1H2202+501 system was refined. According to the results, the optical components of the systems 1H1936+541 and 1H2202+501 are Be stars of the spectral types B1Ve and B3Ve, respectively. These findings, as well as the well-known spectral type distribution of Be stars, can testify to the fact that the object 1H1936+541 belongs to X-ray binary systems. At the same time, taking into account the fact that a very small number of Be/X-ray binaries of the spectral type B3 is known so far, the object 1H2202+501 cannot unambiguously be classified as a Be/X-ray binary. The rotational speeds of the main components of these systems are 246 ± 11 km/s for 1H1936+541 and 111 ± 8 km/s for1H2202+501; the range of the tilt angles of their rotation axes is within 49°–82° and 21°–28°, respectively. Additionally, using the B and V band photometric observations and spectral classes obtained, the interstellar extinction values E(В – V), as well as the distances to the objects, were estimated. In particular, for 1H2202+501, the value of E(В – V) is 0.36 ± 0.03^m, and the distance r ranges from 0.8 to 1.6 kpc. For the 1H1936+541 system, the following values were obtained: E(В – V) = 0.23 ± 0.03^m and r = 2.1–3.6 kpc. The comparison of the distances to the objects with the data from the GAIA DR2 catalog (http://gea.esac.esa.int/archive/) revealed the coincidence of the corresponding values within the limits of errors.

中文翻译：

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到Be / X射线二进制1H1936 + 541和1H2202 + 501的光谱分类和距离估计

摘要

给出了两个Be / X射线二进制文件1H1936 + 541和1H2202 + 501的光谱和光度学研究结果。首次确定1H1936 + 541系统的光学组件的光谱类别，并细化1H2202 + 501系统的光学组件的光谱类别。根据结果​​，系统1H1936 + 541和1H2202 + 501的光学组件分别是光谱类型B1Ve和B3Ve的Be星。这些发现以及众所周知的Be星光谱类型分布，可以证明1H1936 + 541物体属于X射线双星系统这一事实。同时，考虑到迄今为止已知光谱类型为B3的Be / X射线二进制数非常少的事实，不能将对象1H2202 + 501明确地分类为Be / X射线二进制。这些系统的主要部件的转速对于1H1936 + 541为246±11 km / s，对于1H2202 + 501为111±8 km / s；它们的旋转轴的倾斜角范围分别在49°–82°和21°–28°之内。此外，利用B和V波段的光度观测和获得的光谱类别，星际消光值ë（В - V），以及作为到被摄体距离，估计。特别地，对于1H2202 + 501，的值ë（В - V）是0.36±0.03^米，和距离- [R的范围从0.8至1.6 KPC。对于1H1936 + 541系统，得到以下值：ë（В - V）= 0.23±0.03^米和- [R = 2.1-3.6 KPC。到对象的距离与GAIA DR2目录（http://gea.esac.esa.int/archive/）中的数据进行比较，发现相应值在误差范围内是一致的。