Infrared spectroscopy of the nu(3) band of hydrogen cyanide in Comet C/1995 O1 Hale-Bopp

Citation
K. Magee-sauer et al., Infrared spectroscopy of the nu(3) band of hydrogen cyanide in Comet C/1995 O1 Hale-Bopp, ICARUS, 142(2), 1999, pp. 498-508
Citations number
76
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
ICARUS
ISSN journal
0019-1035 → ACNP
Volume
142
Issue
2
Year of publication
1999
Pages
498 - 508
Database
ISI
SICI code
0019-1035(199912)142:2<498:ISOTNB>2.0.ZU;2-S
Abstract
Hydrogen cyanide (HCN) was detected in Comet Hale-Bopp at infrared waveleng ths near 3.0 mu m on four dates between Feb 24.0 and May 1.0 1997 using hig h-resolution spectroscopy, The average rotational temperature retrieved far the (001) vibrational level on UT 1997 April 29.9 was (95 +/- 6) K near th e nucleus, increasing to (122 +/- 8) K in the intermediate coma (4"-10" off the nucleus). The HCN production rate on April 29.9 was (3.09 +/- 0.13) x 10(28) molecules s(-1). When compared with the water production rate obtain ed from direct measurements of the H2O 100-010 band on common observation d ates using the same instrument and data processing algorithms, the weighted average (for the four dates) of the relative abundance (HCN/H2O) was (0.40 +/- 0.05)%. The measured spatial distribution for HCN is consistent with i ts release at the nucleus--no significant contribution from a distributed s ource is required within 10,000 km of the nucleus, (C) 1999 Academic Press.