Evolution of the Outgassing of Comet Hale-Bopp (C/1995 O1) from Radio Observations-Reference-Cited by-同舟云学术

Evolution of the Outgassing of Comet Hale-Bopp (C/1995 O1) from Radio Observations

Published:1997-03-28 Issue:5308 Volume:275 Page:1915-1918
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Biver Nicolas¹,Bockelée-Morvan Dominique¹,Colom Pierre¹,Crovisier Jacques¹,Davies John K.²,Dent William R. F.²,Despois Didier³,Gérard Eric¹,Lellouch Emmanuel¹,Rauer Heike¹,Moreno Raphael¹,Paubert Gabriel¹

Affiliation:

1. N. Biver, D. Bockelée-Morvan, P. Colom, J. Crovisier, E. Gérard, E. Lellouch, H. Rauer, Observatoire de Paris-Meudon, F-92195 Meudon, France.

2. J. K. Davies and W. R. F. Dent, Joint Astronomy Centre, 660 North A'ohoku Place, University Park, Hilo, HI 96720-6030, USA.

3. D. Despois, Observatoire de Bordeaux, B.P. 89, F-33270 Floirac, France. R. Moreno and G. Paubert, Institut de Radioastronomie Millimétrique, Avenida Divina Pastora 7, 18012 Granada, Spain.

Abstract

Spectra obtained from ground-based radio telescopes show the progressive release of CO, CH 3 OH, HCN, H 2 O (from OH), H 2 S, CS, H 2 CO, CH 3 CN, 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 H 2 O sublimation from icy grains was seen beyond 3.5 AU from the sun. The change from a CO-driven coma to an H 2 O-driven coma occurred at about 3 AU. The gas outflow velocity and temperature increased as Hale-Bopp approached the sun.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference42 articles.

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3. Crovisier J., et al., Icarus 115, 213 (1995).

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5. The half-power beam width (HPBW) of the IRAM antenna is 10 arc sec at 230 GHz and 26 arc sec at 89 GHz. Most of the spectra were acquired at a spectral resolution of 20 to 40 kHz corresponding to velocities of 0.026 to 0.052 km s −1 at 230 GHz. Whenever possible a frequency-switching mode was used.

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