Bennett彗星的Na彗发

本文对Rahe等的Bennett(1970Ⅱ)彗星Na彗发单色光度观测资料作了初步理论分析。借助Haser的理论模型求得Na原子及其母分子的标高,估算出它们的寿命;用Dolginov等的理论模型及其它公式和资料,估算出Na原子的外流速度和运动温度。最后作了简单讨论。 

The Sodium Atom Coma of Comet Bennett (1970II)

In this paper, the sodium atom coma of comet Bennett (1970II) is analysed. Using the Na-Dmonochromatic isophotes given by Rahe, average scale-lengths of sodium atom and its parent molecule are found by Haser's theoretic model. Converting to heliocentric distance 1 AU, they are 4.49×105 km and 1.47×104 km respectively. Taking typical outflow velocity, mean lifetimes of sodium atom and its parent molecule are estimated as 1.5×105 seconds and 2.45×104 seconds respectively. With the use of theoretic formula of Dolginov as well as other related formula and data, it is calculated that the thermal velocity and temperature of sodium atom are respectively as 2.04-5.69 km/s and 5.76×103-4.48×104 K, and hydrodynamical (outflow) velocity of sodium atom is 2.66X10 km/s when converting to heliocentric distance 1AU. Finaly, brief discussions on relevant problems are also made.