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EMISSION LINE OBSERVATIONS OF H II REGIONS

Published online by Cambridge University Press:  14 August 2015

J. H. Lacy*
Affiliation:
Department of Physics, California Institute of Technology, Pasadena, California 91125

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Optical observations provide a wealth of information on atomic abundances, the excitation (level of ionization), the kinetic temperature, and the density of the gas in H II regions. However, obscuration by dust limits optical observations of galactic H II regions to those which are nearby (within a few kpc) and which are unobscured by the molecular clouds out of which they are formed (and so generally evolved). Radio observations are unhampered by extinction but provide much more limited information. The abundance of H+, He+ and occasionally C+ can be determined as well as the kinetic temperature of the gas, but no direct information on the abundance of other species or the excitation is available.

Type
Research Article
Copyright
Copyright © Reidel 1981 

References

1. Aitken, D. K. and Jones, B.: 1973, Mon. Not. R. Astr. Soc. 165, p.363.Google Scholar
2. Aitken, D. K., Griffiths, S., and Jones, B.: 1976a, Mon. Not. R. Astr. Soc. 176, p.73P.Google Scholar
3. Aitken, D. K. Griffiths, J., Jones, B., and Penman, J. M.: 1976b, Mon. Not. R. Astr. Soc. 174, p.41P.Google Scholar
4. Aitken, D. K., Griffiths, J., and Jones, B.: 1977, Mon. Not. R. Astr. Soc. 179, p.179.Google Scholar
5. Baluteau, J.-P., Bussoletti, E., Anderegg, M. Moorwood, A. F. M., and Coron, N.: 1976, Ap. J. 210, p.L45.CrossRefGoogle Scholar
6. Baluteau, J.-P., Moorwood, A. F. M., Biraud, Y., Coron, N., Anderegg, M., and Fitton, B.: 1980, preprint.Google Scholar
7. Beck, S. C. Lacy, J. H., Baas, F., and Townes, C. H.: 1978, Ap. J. 226, p.545.Google Scholar
Beck, S. C. Lacy, J. H., and Geballe, R. R.: 1979, Ap. J. 231, p.28.Google Scholar
8. Churchwell, C., Mezger, P. G., and Huchtmeyer, W.: 1974, Astr. Ap. 32, p. 283.Google Scholar
9. Churchwell, C. and Walmsley, C. M.: 1975, Astr. Ap. 38, p.45.Google Scholar
10. Dain, F. W., Gull, G. E., Melnick, G. Harwit, M., and Ward, D. B.: 1978, Ap. J. Letters 221, p.L17.Google Scholar
11. de Vries, J. S., Wander Wal, P. B. and Andriesse, C. D.: 1980, Astr. Ap. in press.Google Scholar
12. Gillett, F. C., Forrest, W. J., Merrill, K. M., Capps, R. W. and Soifer, B. T.: 1975, Ap. J. 200, p.609.Google Scholar
13. Greenberg, L. T., Dyal, P., and Geballe, T. R.: 1977, Ap. J. Letters 213, p.L71.Google Scholar
14. Hefele, H. and Hölzle, E.: 1980, preprint.Google Scholar
15. Hefele, H. and Schulte, in den Bäuman, J.: 1978, Astr. Ap. 66, p.465.Google Scholar
16. Herter, T., Pipher, J. L., Helfer, H. L., Willner, S. P., Puetter, R. C., Rudy, R. J., and Soifer, B. T.: 1980a, preprint.Google Scholar
17. Herter, T., Helfer, H. L., Pipher, J. L., Forrest, W. J., McCarthy, J., Houck, J. R., Willner, S. P., Puetter, R. C., Rudy, R. J., Soifer, B. T., and Gillett, F. C.: 1980b, preprint.Google Scholar
18. Lacasse, M. G., Herter, T., Krassner, J., Helfer, H. C., and Pipher, J. L.: 1980, preprint.Google Scholar
19. Lacy, J. H., Baas, F., Townes, C. H., and Geballe, T. R.: 1979, Ap. J. Letters 227, p.L17.Google Scholar
20. Lacy, J. H., Townes, C. H., Geballe, T. R., and Hollenbach, D. J.: 1980a, Ap. J. in press.Google Scholar
21. Lacy, J. H., Beck, S. C., Townes, C. H., and Geballe, R. R.: 1980b, in preparation.Google Scholar
22. Lester, D. F.: 1979, , Univ. of Cal, Santa Cruz.Google Scholar
23. Lester, D. F. and Rank, D. M.: 1980, preprint.Google Scholar
24. Lester, D. F., Dinerstein, H. L., and Rank, D. M.: 1979a, Ap. J. 229, p.981.CrossRefGoogle Scholar
25. Lester, D. F.,: 1979b, Ap. J. 232, p.139.Google Scholar
26. McCarthy, J. F., Forrest, W. J., and Houck, J. R.: 1979, Ap. J. 231, p.711.Google Scholar
27. Melnick, G., Gull, G. E., Harwit, M., and Ward, D. B.: 1978, Ap. J. Letters 222, p.L137.Google Scholar
28. Melnick, G., Gull, G. E., and Harwit, M.: 1979, Ap. J. Letters 227, p.L29.CrossRefGoogle Scholar
29. Mezger, P. G., Pankonin, V. Schmid - Burgk, J. Thum, C. and Wink, J.: 1980, Astr. Ap. in press.Google Scholar
30. Moorwood, A. F. M., Baluteau, J.-P., Anderegg, M., Coron, N., and Biraud, Y.: 1978, Ap. J., 224, p.101.Google Scholar
31. Moorwood, A. F. M., Baluteau, J.-P., Anderegg, M., Coron, N., Biraud, Y., and Fitton, B.: 1980a, Ap. J. in press.Google Scholar
32. Moorwood, A. F. M., Salinari, P., Furniss, I., Jennings, R. E., and King, K. J.: 1980b, preprint.Google Scholar
33. Neugebauer, G., Becklin, E. E., Matthews, K., and Wynn - Williams, C. G.: 1978, Ap. J. 220, p.149.CrossRefGoogle Scholar
34. Panagia, N. and Smith, L. F.: 1978, Astr. Ap. 62, p.277.Google Scholar
35. Panagia, N.: 1980, in Shaver, P. A. (ed.), Radio Recombination Lines, D. Reidel Publ. Co., Dordrecht, Boston, London, p. 99.Google Scholar
36. Pipher, J. L., Sharpless, S., Savedoff, M. P., Krassner, J., Varlese, S., Soifer, B. T., and Zeilik, M.: 1977, Astr. Ap. 59, p.215.Google Scholar
37. Pipher, J. L., Soifer, B. T., and Krassner, J.: 1979, Astr. Ap. 74, p.302.Google Scholar
38. Rank, D. M., Dinerstein, H. L., Lester, D. F., Bregman, J. D., Aitken, D. K., and Jones, B.: 1978, Mon. Not. R. Astr. Soc. 185, p.179.Google Scholar
39. Russell, R. W., Melnick, G., Gull, G. E., and Harwit, M.: 1980, preprint.Google Scholar
40. Righini - Cohen, G., Simon, M., Young, E. T.: 1979, Ap. J., 232, p.782.Google Scholar
41. Soifer, B. T. and Pipher, J. L.: 1975, Ap. J. 199, p.663.Google Scholar
42. Soifer, B. T., Russell, R. W., and Merrill, K. M.: 1976, Ap. J. 210, p.334.CrossRefGoogle Scholar
43. Storey, J. W. V., Watson, D. M., and Townes, C. H.: 1979, Ap. J. 233, p.109.Google Scholar
44. Thompson, R. I. and Tokunaga, A. T.: 1980, Ap. J. in press.Google Scholar
45. Ward, D. B., Dennison, B., Gull, G. E., and Harwit, M.: 1975, Ap. J. 202, p.L31.Google Scholar
46. Watson, D. M. Storey, J. W. V., Townes, C. H., and Haller, E. E.: 1980, preprint.Google Scholar
47. Willner, S. P.: 1976, Ap. J. 206, p.728.Google Scholar
48. Willner, S. P.,: 1977, Ap. J. 214, p.706.Google Scholar
49. Willner, S. P.,: 1978, Ap. J. 219, p.870.Google Scholar
50. Wilson, T. L. Bieging, J., Wilson, W. E.: 1979, Astr. Ap. 71, p.205.Google Scholar
51. Wollman, E. R.: 1976, , Univ. of Calif., Berkeley.Google Scholar
52. Wollman, E. R., Geballe, T. R., Lacy, J. H., Townes, C. H. and Rank, D. M.: 1976, Ap. J. Letters 205, p.L5.Google Scholar
53. Townes, C. H.,: 1977, Ap. J. Letters 218, p.L107.Google Scholar
54. Wynn - Williams, C. G., Becklin, E. E., Matthews, K., and Neugebauer, G.: 1978, Mon. Not. R. Astr. Soc. 183, p.237.Google Scholar