The Yunnan Astronomical Observatory of the Chinese Academy of Sciences has discovered more than 50 new pulsating binary stars

Dr. Shi Xiangdong and Qian Shengbang of the Yunnan Astronomical Observatory Research Group of the Chinese Academy of Sciences have made new progress in the search and research of pulsating Daling-5 (EA) type binary stars. The work found 57 new binary star systems containing pulsating variable stars from 1626 Daling V-type binary stars observed by the Transiting Exoplanet Survey Satellite satellite in the United States, and further analytical studies were carried out. The research was recently published in the international academic journal The Astrophysical Journal Supplement Series.

The binary star-eating system is the most accurate and reliable object for solving the basic physical parameters such as stellar mass, radius and luminosity, and pulsating variable stars are of great significance for determining the distance of celestial bodies and detecting the internal structure of stars. When pulsating variable stars are in binary eclipses, they can not only determine their reliable basic physical parameters, but also provide a good opportunity to study the effects of binary tidal interactions and material transfer on stellar pulsations. Since the 1970s, scholars have been probing pulsating variable stars in binary-eating stars. However, due to a variety of observational conditions, only more than 200 pulsating binary stars have been found so far.

TESS was launched in April 2018 as NASA’s exoplanet exploration mission. Its main scientific mission is to detect exoplanets around bright stars in the all-day region. At the same time, its high-precision continuous uninterrupted metering data also provides an unprecedented opportunity for the study of variable source objects such as binary and variable stars. Using the metering data of 1626 Type EA binary star systems observed by the TESS telescope, 57 new binary stars containing pulsating variable stars were detected from them, and parameters such as the pulsation period and amplitude of pulsating substars were given. Figure 1 shows the relationship between the orbital period of the pulsating binary star and the pulsating cycle, and the red solid circle in the figure represents the newly discovered system. Further analytical studies revealed that of the 57 pulsating binary stars, 43 targets are The Great Ling V semi-contiguous binary stars containing the shield δ pulsating variable stars, and the remaining 14 are eclipse binary systems containing other types of pulsating variable stars.

Figure 1.Diagram of the orbital period of a pulsating binary star versus the period of the pulsating cycle. The newly discovered target is a solid red circle whose size corresponds to the pulsating amplitude value.

The discovery of these new targets increased the total number of pulsating binary stars by 20-25%, which is conducive to further studying the material exchange evolution, tidal interactions and stellar pulsations of binary stars.

The research results have been funded by the National Natural Science Foundation of China key projects and youth projects. (Source: Yunnan Astronomical Observatory, Chinese Academy of Sciences)

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