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名稱Title
2021天文年會
國立嘉義大學蘭潭校區
5月21日至23日

論文摘要

Photometric Investigation for Mira Variables in Large and Small Magellanic Cloud

[ Poster ]

Jia-Yu Ou(Graduate Institute of Astronomy, National Central University);Chow-Choong Ngeow(Graduate Institute of Astronomy, National Central University)

Mira variables are asymptotic giant branch pulsating stars that exhibit large cyclical variation spanning 100 to 700 days, but in some extreme cases the variations can go beyond 1500 days. Mira variables can be divided into O-rich and C-rich Miras with spectra, they can also be divided into Mira ,symbiotic Mira ,Mira with long term trend and Long period variable can be subset to long secondary periodic variables with some variations in their light curve. Our purpose is to use the machine learning technique for classifying various sub-classes of Mira. We collected 2015 confirmed Miras light curve data in LMC and SMC from OGLE database. Based on the light curves the Mira were divided into regular Miras and multi-periodic Miras. We used python package Feature analysis for time series (FATs) to extract the light curve features, then we used these features to separate out the regular Mira and multi-periodic Mira using machine learning techniques. We calculate that regular Miras the magnitude of maximum light can improve the period-luminosity relation than mean light, and we also found that regular Miras and multi-period Miras exhibit differences in color index using the OGLE photometric dataset and PL relation in IR photometric data. Finally, we have collected SED data of regular Mira and multi-period Mira based on the SIMBAD database. We fit the SED component separated into the star part and dust shell part with blackbody radiation function. We found the multi-periodic Mira has much more dust component than regular Mira.