Evolution of the Outgassing of Comet Hale-Bopp (C/1995 O1) from Radio Observations
Evolution of the Outgassing of Comet Hale-Bopp (C/1995 O1) from Radio Observations
复制标题
射电观测中海尔-波普彗星 (C/1995 O1) 放气的演变
作者：
N. Biver;D. Bockelée;P. Colom;J. Crovisier;J. Davies;W. Dent;D. Despois;É. Gérard;E. Lellouch;H. Rauer;R. Moreno;G. Paubert
从地面射电望远镜获得的光谱显示，当海尔-波普彗星（C/1995 O 1）从6.9到1.4天文单位（Au）接近太阳时，CO，CH 3OH，HCN，H2O（来自OH），H2S，CS，H2 CO，CH 3CN和HNC的逐步释放。在远离太阳的彗发中，挥发性更强的物种相对更丰富，但过多和挥发性之间没有直接的相关性。在距离太阳3.5 Au以外的地方发现了冰颗粒升华出H2O的证据。从CO驱动的彗发到H2O驱动的彗发的变化发生在大约3 Au处。气体外流速度和温度随着海尔-波普接近太阳而增加。
Spectra obtained from ground-based radio telescopes show the progressive release of CO, CH3OH, HCN, H2O (from OH), H2S, CS, H2CO, CH3CN, and HNC as comet Hale-Bopp (C/1995 O1) approached the sun from 6.9 to 1.4 astronomical units (AU). The more volatile species were relatively more abundant in the coma far from the sun, but there was no direct correlation between overabundance and volatility. Evidence for H2O sublimation from icy grains was seen beyond 3.5 AU from the sun. The change from a CO-driven coma to an H2O-driven coma occurred at about 3 AU. The gas outflow velocity and temperature increased as Hale-Bopp approached the sun.