Astronomy and Astrophysics – Astronomy
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003dps....35.2803w&link_type=abstract
American Astronomical Society, DPS meeting #35, #28.03; Bulletin of the American Astronomical Society, Vol. 35, p.967
Astronomy and Astrophysics
Astronomy
Scientific paper
The nitrogen abundance in comets is critical for understanding conditions in the early solar nebula. Most models predict a relatively high nitrogen abundance in the outer solar nebula and in comets, with most of the volatile nitrogen in the form of N2. The N2+ B-X 0-0 band at 3914 A was identified in comet spectra nearly a century ago, but its identification in recent bright comets has proven difficult. Here we report a feature at 3914 A that we identify with the N2+ B-X 0-0 band in a tail spectrum (resolution 2500) of comet Hale-Bopp on April 13, 1997. If this band is N2+, then we find an N2+/CO+ ratio of the same order as values found in comets 1P/1982 U1 (Halley) and C/1987 P1 (Bradfield). If the dynamics of N2+ and CO+ were comparable in comet Hale-Bopp then the volatile N2/CO ratio inferred in comet Hale-Bopp is much smaller than most model predictions.
Heyd Rodney S.
Wyckoff Susan
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