Descriptive flora of Puerto Rico and adjacent islands: by Alain H Liogier

By Alain H Liogier

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Thermal ionization of hydrogen atoms is shown to be extremely inefficient, such that more than 50 per cent of these atoms remain neutral, at least until pressure ionization occurs. Stewart and Pyatt (1966) have shown that coulomb binding of electrons to the plasma will lower the ionization energy of hydrogen at higher densities, while pressure ionization, as indicated by Rouse (1967), is brought about mainly from the partial shielding of the electrons in the K-shell of neutral atoms by the free electrons lying within the classical Bohr radius.

And NAKANO, T. (1965) Prog. Theor. Phys. 34, 754. HERBIG, G. H. (1962) Adv. Astr. Astrophys. 1, 47. HERBIG, G. H. (1968) Astrophys. J. 152, 439. HOFFMEISTER, C. N. 278, 24. KuKARKiN, B. V. and PARENAGO, P. P. , Moscow. LARSON, R. B. (1969) Mon. Not. Roy. astr. Soc. 145, 271. LARSON, R. B. (1972a) Ibid. 157, 121. 31 The Nebular Variables LARSON, R. B. (1972b) Ibid, 156, 437. Low, F . J. (1970) Mem. Soc, Roy, Sei. Liege 19, 281. L o w , F . , JOHNSON, H . , KLEINMANN, D . , LATHAM, A. S. and GEISEL, S.

WENZEL, W. (1955b) Ibid. No. 193. WENZEL, W. (1955c) Ibid. No. 174. WENZEL, W. (1969) Non-Periodic Phenomena in Variable Stars, p. 63, Reidel, Dordrecht. 36 PLATE II. Variations in NGC 2261 associated with R Monocerotis. ) CHAPTER 6 Interaction with nebulosity all of the contracting, pre-main sequence variables, of which the RW Aurigae stars form a group, are in physical contact with interstellar matter. The light variations are determined, in part at least, by the local behaviour of the circumstellar dust shells in which they are embedded while, on the other hand, these shells possess a definite connection with the larger interstellar clouds.

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