标题： 关于A0538-66中421天周期性的稳定性研究 显示英文标题

标题： On the Stability of the 421-day Periodicity in A0538-66

摘要： 本文分析了哈佛和施密特胶片档案数据中周期为16.6天的Be X射线双星A0538-66长达70年的数据，以寻找在MACHO测光中发现的长期周期420.82 +/- 0.79天的存在。 我们在档案数据中发现了长期周期为421.29 +/- 0.95天的证据，并检查了其稳定性。 我们还将档案数据与MACHO数据集结合，通过循环计数分析改进轨道周期的测定精度，将其值精炼为16.6460 +/- 0.0004天。我们还使用1980-1995年间文献中记录的A0538-66观测数据测试了我们在先前论文（Alcock等，2001）中提出的模型，约束系统倾角为i > 74.9 +/- 6.5度。 显示英文摘要

摘要： In this paper we analyse 70 years of archival Harvard and Schmidt plate data of the 16.6 d Be X-ray binary A0538-66 in order to search for the presence of the long-term period of 420.82 +/- 0.79 d found in MACHO photometry (Alcock et al. 2001). We find evidence for a long-term period of 421.29 +/- 0.95 d in the archival data, and examine its stability. We also combine the archival and MACHO datasets in order to improve the accuracy of the orbital period determination, using a cycle-counting analysis to refine its value to 16.6460 +/- 0.0004 d. We also test the model proposed in our previous paper (Alcock et al. 2001) with observations documented in the literature for A0538-66 from 1980-1995, constraining the system inclination to be i > 74.9 +/- 6.5 deg.