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0141828730
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Material and methods are available as supporting material on Science online.
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13C ratio (up to 5000) was measured in a number of small C-rich grains in P/Halley, the only comet for which compositional data about the "dust" are available. [E. K. Jessberger, Space Sci. Rev. 90, 91 (1999), and references therein.] Jessberger suggests that a link exists between the cometary dust, IDPS, and circumstellar grains.
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0141494029
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14N. A new analysis of some of these comets is under way.
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11
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0030610377
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0036083890
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An excellent recent review of these questions is to be found in L. M. Woodney et al., Icarus 157, 193 (2002).
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Woodney, L.M.1
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0000565535
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These "CHON" grains, rich in the light elements (H, C, N, and O), were discovered in the coma of Halley's comet; they are tiny (submicrometer- to micrometer-sized) particulates containing complex organic compounds of low degrees of volatility (5). M. F. A'Hearn et al. [Nature 324, 649 (1986)] first suggested that CN radicals may be released from CHON grains.
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A'Hearn, M.F.1
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0141605595
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3 km from the comet nucleus.
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0141605594
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14N is a secondary element produced by long-lived low- and intermediate-mass stars (19, 20, 21).
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27
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0002039721
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0141717387
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We thank S. B. Charnley for the suggestion concerning "HCN polymers."
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A. L. Cochran et al., Icarus 146, 583 (2000).
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Cochran, A.L.1
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14N)⊕ - 1]
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0034634341
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K. Hashizume et al., Science 290, 1142 (2000).
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Hashizume, K.1
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0141717390
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Based on observations of comet Hale-Bopp made with the Nordic Optical Telescope, La Palma, Canary Islands, Spain. The WM1 observations were carried out at the ESO. We thank the director of the ESO VLT for approving our program for Director's Discretionary Time (ESO DDT 268.C-5570). We also thank the observatory staff astronomers who have carried out these observations. The authors are grateful to J. Aléon for useful discussions. C.A., J.M., and D.H. acknowledge financial support from the Belgian NFSR.
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