紀要論文 トラペジウムクラスター中の星の長期近赤外変光特性

伊藤, 綾香

内容記述
We examined the properties of 45 variable stars in the Trapezium cluster, which we identified from J, H and Ks band near-infrared imaging with the 1.4 m IRSF telescope carried out at three epochs, 2000, 2005, and 2014.Their positions in the color-magnitude diagram and the two-color diagram show that they are young stellar objects. The variability over 2000 to 2014 of the majority of them (36/45) are found to be classified into two patterns. One group became brighter and bluer while the other became fainter and redder. Stars with largerbrightness change showed larger color change with the time scale of 〜10 years. The distribution of slope angles in the J vs J-H diagrams of 2014 is similar to that of 2005 showing the bimodal feature consistent with previous work. Comparison of the slope angles with that of interstellar extinction suggests that the origin of variation ofabout two-thirds of the 45 variables is the change in the column density of material similar to that responsible for the interstellar extinction. The light variation of the remaining variables may be due to the change in accretion and circumstellar disk activity.Key Words : young stars, variable stars, infrared, open clusters, Orion, Trapezium cluster
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