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UBV photometric observations of LQ And and EM Cep were made with 60 cm telescope at Beijing Astronomical Observatory from 1990 to 1992. Some results are briefly summarized as follows:(1) LQ And317 data sets have been obtained. HR9011 was used as the comparison star. Combining these data with some published VBV measurements of secured during 1983-1988, an improved period of light variation has been derived, and a new ephemeris for minimum light has been suggested:T min. light = HJD 2445621.5964 0.309418 × E.(2) EM Cep277 data sets have been obtained. HD208218 was used as the comparison star. With these data a minimum light time base been derived at HJD 2448912.0452. Combining this value with all published previously, an improved linear ephemeris has been derived with a rms of 0.01382:T min. light = HJD 2440134.7338 0.8061840 x EIt is of interest to note that there is also a possibility of decrease tendency of the period. We have derived an ephemeris by using a binomial fitting with a rms of 0.01155: 相似文献
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1990年至1992年期间,本文作者用北京天文台兴隆站的60cm镜对LQ And作了UBV测光,取得了317组的观测数据,并结合1983年至1988年共479组数据进行了分析,结果表明:期间LQ And有稳定的快光度周期,新确定的光变周期同文献中给出的略有差别,为0.309418天。 相似文献
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为研究Be/X射线双星的光度变化,正利用北京天文台60cm望远镜进行UBV光电测光。本文叙述一年来的观测。并结合观测结果对观测和归算方法作了若干讨论,我们主要采用较差测光附加标准星观测以便转换到标准系统。消光计算时考虑零点漂移和可能与大气质量平方的线性关系:m-m_0=k′X k″c k_2X~2 k_tt q。标准系统与观测系统的星等和色指数采用线性关系转换。 相似文献
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1986年8月25—31日,第一次全国恒星和行星物理学术讨论会在贵阳召开。会议由中国天文学会恒星和行星物理委员会负责组织和主持,得到了全国各有关天文台和大专院校的热情支持。出席会议的有十四个单位的六十五位代表,共宣读学术论文、综合评述和调研报告四十篇,内容涉及恒星的形成和演化,恒星风,恒星角直径、光度、光谱、偏振及同位素谱的观测研究,双星和星团,变星,天体 相似文献
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1. Discovory The star HR 8851 was discovered occasionally to be variable star which has somethinglike δ Scutl stars on December 23 and 25, 1992. These observations were made in Ⅴ bandon the 60cm reflector located at Xinglong Station, Beijing Astronomical Observatory. The light curves are shown in Fig.1. Using periodogram method, we estimate the variation peri- 相似文献
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本文给出了一个统计方法,可以由观测得到的Be星视自转速度U=V sin i,估计出其真自转速度V;本文证实了Be星不是以临界速度旋转的,其真自转速度和临界速度之比为0.7左右。 相似文献
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