The burning behavior and burn-time of firework stars and their compositions were observed. The burning behavior is discussed from the perspective of specific spectral peaks observed in the combustion flame. Although the intensity of combustion flame fluctuated greatly with time, the total burning times of the stars had little scatter. During the combustion of the powdered star composition that had been loaded into paper tubes, at first the flame projected from the upper end of the tube. Sometimes, the flame disappeared below the upper end of the tube, with the combustion continuing down inside the tube; however, the total combustion time did not change much. For an estimation of burn rate of a firework star, the combustion of the powdered composition in a paper tube may be useful from the view point of simplicity and the small amount of scatter in the observed data.
煙火星およびその組成物の燃焼挙動と燃焼時間を測定し，それらの特性について考察した。燃焼挙動は燃焼火炎の特定のスペクトルピークのプロフィルから考察した。煙火星および組成物の燃焼火炎の強さは時間的な変動が大きいが，全体の燃焼時間のバラツキはそれほど大きくなかった。紙筒入り組成物粉末の燃焼では，最初筒口炎が見られる。その後筒口炎はなくなり筒内部で燃焼を継続する場合が見られたが，燃焼時間には差が見られなかった。煙火星の燃焼速度の推定には，実験の簡便性とバラツキの小ささから組成物粉末の紙筒内燃焼法が優れている。
Firework star, Star composition, Burning time, Spectrum peak profile.