基于TESS数据的早型食双星HD190967、HD35921、HD228854和HD100213轨道周期变化的分析研究

Orbital Period Variations of Early-Type Eclipsing Binaries HD190967,HD35921,HD228854 and HD100213:A TESS Data Analysis

HD190967、HD35921、HD228854和HD100213都是O型或B型的早型双星,轨道周期分别为6.519 d、4.0024 d、1.8855 d和1.3872 d,它们都属于长周期双星.这类双星数目少,且难以获得完整的光变曲线.TESS(Transiting Exoplanet Survey Satellite)空间望远镜的长时标、短曝光和高精度光度测量为这4颗源提供了优质的数据.利用从TESS获取的光极小时刻和历史数据,对这4颗早型双星的轨道周期进行了分析研究.研究表明4颗源的轨道周期都有长期增加的趋势,HD228854和HD100213的轨道周期除了长期增加外还叠加了正弦变化.分析发现HD190967、HD228854和HD100213这3颗恒星轨道周期增加的原因是伴星与主星间的物质交流造成的,HD35921轨道周期增加的原因是主星星风损失.目前HD228854和HD100213的轨道周期正弦变化比较合理的解释是由于第三天体影响导致的光时轨道效应.

HD190967,HD35921,HD228854,and HD100213 are early-type O or B binaries with orbital periods of 6.519 days,4.0024 days,1.8855 days,and 1.3872 days,respectively.They belong to the category of long-period binaries,which are rare and difficult to obtain complete light curves.The TESS(Transiting Exoplanet Survey Satellite)space telescope provides high-quality data for these four sources with its long-term,short-exposure,and high-precision photometric measurements.In this paper,we use the light extremum times obtained from TESS and historical data to analyze and study the orbital periods of these four early-type binaries.The results show that the orbital periods of all four sources are increasing in the long term,and HD228854 and HD100213 also exhibit sinusoidal variations in addition to the long-term increase.We find that the orbital period increase of HD190967,HD228854,and HD100213 is caused by mass transfer from the secondary star to the primary star,while the orbital period increase of HD35921 is caused by mass loss from the stellar wind of the primary star.The most reasonable explanation for the orbital period sinusoidal variations of HD228854 and HD100213 is the light-travel time orbit effect due to the presence of a third body.