Abstract
The interstellar UV field at 1565 Å is calculated around nearby OH/IR sources. The front-back asymmetry observed in the 1612 MHz maser line profile is well correlated with anisotropy of the interstellar UV flux. For some sources the spatial positions of the 1612 MHz masers are confined to the position angles for which stronger UV radiation occurs. These facts strongly support the theory of the photoproduction of OH from H2O induced by ambient interstellar UV photons penetrating the circumstellar shell. A simple model of the 1612 MHz maser with OH photoproduction suggests that the influence of the UV field on the observed maser profiles is governed by the mass loss rate and the relative abundances of OH and H2O molecules.
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References
Allen, C. W.: 1973,Astrophysical Quantities, 3rd ed., Athlone Press, London.
Baud, B.: 1981,Astrophys. J. 250, L79.
Booth, R. S., Kus, A. J., Norris, R. P., and Porter, N. D.: 1981,Nature 290, 382.
Bowers, P. F., Johnston, K. J., and Spencer, J. H.: 1983,Astrophys. J. 274, 733.
Bowers, P. F., Reid, M. J., Johnston, K. J., Spencer, J. H., and Moran, J. M.: 1980,Astrophys. J. 242, 1088.
Chapman, J. M. and Cohen, R. J.: 1985,Monthly Notices Roy. Astron. Soc. 212, 375.
Chapman, J. M. and Cohen, R. J.: 1986,Monthly Notices Roy. Astron. Soc. 220, 513.
Deguchi, S.: 1982,Astrophys. J. 259, 634.
Diamond, P. J., Norris, R. P., and Booth, R. S.: 1984,Monthly Notices Roy. Astron. Soc. 207, 611.
Diamond, P. J., Norris, R. P., Rowland, P. R., Booth, R. S., and Nyman, L.-A.: 1985,Monthly Notices Roy. Astron. Soc. 212, 1.
Draine, B. T.: 1978,Astrophys. J. Suppl. 36, 595.
Engels, D.: 1979,Astron. Astrophys. Suppl. 36, 337.
Fix, J. D. and Weisberg, J. M.: 1978,Astrophys. J. 220, 836.
Fix, J. D., Mutel, R. L., Benson, J. M., and Claussen, M. L.: 1980,Astrophys. J. 241, L95.
Goldreich, P. and Scoville, N.: 1976,Astrophys. J. 205, 144.
Henry, R. C.: 1977,Astrophys. J. Suppl. 33, 451.
Herman, J.: 1983, Ph.D. Thesis, Leiden.
Hoffleit, D.: 1982,The Bright Star Catalogue, Yale University, New Haven.
Huggins, P. J. and Glassgold, A. E.: 1982,Astron. J. 87, 1828.
Jura, M.: 1974,Astrophys. J. 191, 375.
Lee, L. C.: 1984,Astrophys. J. 282, 172.
Moran, J. M., Lichten, S., Reid, M., Huguenin, R., and Predmore, R.: 1985, in preparation.
Shull, J. M. and Van Steenberg, M.: 1985,Astrophys. J. 294, 599.
Thompson, G. I., Nandy, K., Jamar, C., Monfils, A., Houziaux, L., Carnochan, D. J., and Wilson, R.: 1978,Catalogue of Stellar Ultraviolet Fluxes, The Science Research Council.
Van Dishoeck, E.: 1984, Ph.D. Thesis, Leiden.
Wilson, W. J. and Barret, A. H.: 1972,Astron. Astrophys. 17, 385.
Wilson, W. J., Schwartz, P. R., Neugebauer, G., Harvey, P. M., and Becklin, E. E.: 1972,Astrophys. J. 177, 523.
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Szymczak, M. Evidence for the effect of the interstellar far UV-radiation on circumstellar shells. Astrophys Space Sci 139, 63–73 (1987). https://doi.org/10.1007/BF00643812
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DOI: https://doi.org/10.1007/BF00643812