Autor:	W. K. Huchtmeier, P. Janardhan, C. Lemme, T. L. Wilson, P. Gensheimer, M. K. Bird
Rok vydání:	1997
Předmět:	Physics Comet Astronomy and Astrophysics Rotational temperature Astrophysics Comet Hale–Bopp law.invention Ammonia production Telescope Ammonia chemistry.chemical_compound chemistry Space and Planetary Science law K band Metastability Earth and Planetary Sciences (miscellaneous)
Zdroj:	Earth, Moon, and Planets. 78:21-28
ISSN:	0167-9295
Popis:	K-band radio observations of comet Hale-Bopp (C/1995 O1) were conducted in March/April 1997 at the 100-m Telescope of the Max-Planck-Institut fur Radioastronomie. Emission was firmly detected from the five lowest metastable (J = K)inversion transitions of ammonia. Assuming a thermal distribution for the metastable states of NH3, we derive a rotational temperature of 104 ± 30 K and an ammonia production rate at perihelion of6.6 ± 1.3 × 1028 s-1.The updated ammonia-to-water abundance ratio is found to be of the order of 1.0%. We also report a marginal detection of the 616–523transition line of water at λ = 1.35 cm.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::97834f41b3f865f210c46da785fa014b https://doi.org/10.1023/a:1006246606131 Zobrazit plný text záznamu Full text from SpringerLink