The spin temperature of methanol in comet Hale-Bopp

Details The spin temperature of methanol in comet Hale-Bopp The spin temperature of methanol in comet Hale-Bopp

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sf2a.conf..421p&link_type=abstract

SF2A-2007: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics held in Grenoble, France, July

Astronomy and Astrophysics

Astrophysics

Scientific paper

Measurements of the ortho-to-para ratio (OPR) of small hydrogenated molecules (H2O, NH2 which leads to NH3, and CH3) in the coma of comets give spin temperatures clustered around 30 K, which is most of the time lower than the associated rotational temperatures. We investigate here the spin temperature of methanol from the observations of the 241 and 145 GHz sets of rotational lines, obtained on C/1995 O1 (Hale-Bopp) on two different dates with the 15-m and 30-m antennas of IRAM.

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