The Production of O({1}D) in Comet Hale-Bopp

Details The Production of O({1}D) in Comet Hale-Bopp The Production of O({1}D) in Comet Hale-Bopp

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000dps....32.4104m&link_type=abstract

American Astronomical Society, DPS Meeting #32, #41.04; Bulletin of the American Astronomical Society, Vol. 32, p.1072

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Scientific paper

Photometric observations of comet Hale-Bopp (C/1995 OI) in the forbidden red line of neutral oxygen ([O I] 6300 Å) with three independent telescopes on Kitt Peak in March of 1997 imply a production rate of the metastable O({1}D) of 300--400x1028 s-1. Using water production rates determined by Combi et al. (2000), and the standard water and OH photodissociation branching ratios found in Hübner et al. (1992) and Van Dishoeck and Dalgarno (1984), we expect 88 x 1028 s-1. We explore several hypotheses that would account for this discrepancy, including: (1) the branching ratio of OH to O({1}D) is incorrect, (2) the photodissociation of other species, such as CO and CO2 contribute significantly to O({1}D) production, and (3) ground state oxygen is excited to the metastable level by collisional processes. This work has been supported under NSF grant AST-9615625 and NASA grant NAG 5-7952.

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