I have been a graduate student in the Group of Pulsating Variable Stars and Asteroseismology of the Department of Astronomy of Beijing Normal University since September of 2018. My main research topic is asteroseismology and pulsating properties of ZZ Ceti Stars. White dwarf stars are the final products of evolutions of most stars in the Galaxy, including a type of white dwarfs with hydrogen atmosphere (ZZ Ceti stars). When they evolve across a special range of temperature, their luminosities will be variable periodically, becoming so-called pulsating white dwarfs. As the lowest temperature pulsating white dwarfs, ZZ Ceti stars show periodic changes in luminosity, but have stable internal structures and chemical compositions that are not different from ordinary white dwarf stars. Therefore, the detailed study of ZZ Ceti stars with asteroseismology is an excellent method for the study of white dwarfs. The current research plan is as follows,
1.We plan to obtain data for a ZZ Ceti star by multi-site observations. This star is identified as a one-mode ZZ Ceti star with short period and low amplitude located at the blue edge of the instability strip. We would have long-enough time-series photometric data with good time coverage, allowing a comprehensive understanding of the pulsation properties and an efficient asteroseismological analysis by this way.
2.There are only a small number of pulsating white dwarfs detected. Even for the DA-type pulsating white dwarfs, which have the largest number of members, there are only more than 200 samples confirmed at present. We plan to look for new pulsating white dwarfs based on the LAMOST survey database. Firstly, according to the experienced instability strip of ZZ Ceti stars, we shall select candidates. Then, we will try to search for new pulsating white dwarfs in these candidates through time-series photometric observations.
E-mail:201821160012@mail.bnu.edu.cn