Abstract
IN a continuation of our search for interstellar 'needles' in the meteoritic 'haystack'1,2, we have now identified graphite grains, 1–4 µm in diameter, in the Murchison C2 chondrite. The interstellar origin of these grains is demonstrated by their 12C/13C ratio, which ranges from 0.09 to 16 times the Solar System value, and by the presence of the noble-gas component 'Ne–E(L)', nearly monoisotopic 22Ne from the decay of 22Na (with a half-life of 2.6 yr). The grains apparently formed in the outflows of novae and red giants, and demonstrate that graphite can form as a circumstellar condensate. Curiously, interstellar graphite is much rarer than interstellar microdiamonds (<2 p.p.m. compared to 400 p.p.m.) or even SiC (6–9 p.p.m.), although diamond is thermodynamically unstable relative to graphite. The main reason may be preferential destruction. Graphite is the third type of circumstellar grain that has become available for laboratory study.
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References
Tang, M. & Anders, E. Geochim. cosmochim. Acta 52, 1235–1244 (1988).
Zinner, E., Tang, M. & Anders, E. Geochim. cosmochim. Acta 53, 3273–3290 (1989).
Jungck, M. H. A. & Eberhardt, P. Meteoritics 14, 439–441 (1979).
Anders, E. in Meteorites and the Early Solar System (eds Kerridge, J. F. & Matthews, M. S.) 927–955 (University of Arizona Press, Tucson, 1988).
Carr, R. H., Wright, I. P., Pillinger, C. T., Lewis, R. S. & Anders, E. Meteoritics 18, 277 (1983).
Lambert, D. L., Gustafsson, B. Eriksson, K. & Hinkle, K. H. Astrophys. J. Suppl. Ser. 62, 373–425 (1986).
Renzini, A. & Voli, M. Astr. Astrophys. 94, 175–193 (1981).
Tang, M. et al. Geochim. cosmochim. Acta 52, 1221–1234 (1988).
Frenklach, M., Carmer, C. S. & Feigelson, E. D. Nature 339, 196–198 (1989).
Draine, B. T. Astrophys. & Space Sci. 65, 313–335 (1979).
Czyzak, S. J., Hirth, J. P. & Tabak, R. G. Vistas in Astr. 25, 337–382 (1982).
Nuth, J. A. Nature 318, 166–168 (1985).
Salpeter, E. E. Astrophys. J. 193, 579–584 (1974).
Tang, M. & Anders, E. Astrophys. J. 335, L31–L34 (1988).
Yarbrough, W. A. & Messier, R. Science 247, 688–696 (1990).
Nuth, J. A. III Nature 329, 589 (1987).
Badziag, P., Verwoerd, W. S., Ellis, W. P. & Greiner, N. R. Nature 343, 244–245 (1990).
Bar-Yam, Y. & Moustakas, T. D. Nature 342, 786–787 (1989).
Lewis, R. S., Anders, E. & Draine, B. T. Nature 339, 117–121 (1989).
Clayton, D. D. Nature 257, 36–37 (1975).
Mitchell, R. M. & Evans, A. Mon. Not. R. astr. Soc. 109, 945–954 (1984).
Harrison, T. E. & Gehrz, R. D. Astr. J. 96, 1001–1010 (1988).
Zinner, E., Wopenka, B., Amari, S. & Anders, E. Lunar planet. Sci. 21, 1379–1380 (1990).
Kroto, H. W. & McKay, K. Nature 331, 328–331 (1988).
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Amari, S., Anders, E., Virag, A. et al. Interstellar graphite in meteorites. Nature 345, 238–240 (1990). https://doi.org/10.1038/345238a0
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DOI: https://doi.org/10.1038/345238a0
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