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High-resolution observations of Hα emission line from R Aquarii


We have obtained Hα emission line profiles from R Aquarii, a Mira variable surrounded by a complex nebulosity, using a very high-resolution Fabry-Pérot spectrometer. A new feature that was seen in our observations is the fact that the line profile shows a splitting which we interpret as due to two expanding shells surrounding the star with velocities of ∼5 km s−1 and ∼15 km s−1. The expansion velocities show an acceleration outwards due perhaps to the radiation pressure caused momentum transfer. Possible periodic variation of radial velocity derived from observations is discussed.

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  1. Brugel, E. W., Cardelli, J. A., Szkody, P., and Wallerstein, G.: 1984,Publ. Astron. Soc. Pacific 96, 78.

  2. Ilovaisky, S. A. and Spinrad, H.: 1966,Publ. Astron. Soc. Pacific 78, 527.

  3. Jacobsen, T. S. and Wallerstein, G.: 1975,Publ. Astron. Soc. Pacific 87, 269.

  4. Johnson, H. M.: 1980,Astrophys. J. 237, 840.

  5. Kaler, J. B.: 1982,Sky Telesc 64, 141.

  6. Kukarkin, B. al.: 1969,General Catalogue of Variable Stars, Vol. 1, Moscow.

  7. Lampland, C. O.: 1923,Publ. Astron. Soc. Pacific 81, 134.

  8. Merrill, P. W.: 1950,Astrophys. J. 112, 514.

  9. Michalitsianos, A. G., Kafatos, M., and Hobbs, R. W.: 1980,Astrophys. J. 237, 506.

  10. Olnon, F. M.: 1981, in I. Iben, Jr. and A. Renzini (eds.),Physical Processes in Red Giants, D. Reidel Publ. Co., Dordrecht, Holland, p. 237.

  11. Sahu, K. C., Desai, J. N., and Jog, N. S.: in A. Boksenberg and D. L. Crawford (eds.),Proc. SPIE 445, 33.

  12. Sopka, R. J., Herbig, G., Kafatos, M., and Michalitsianos, A. G.: 1982,Astrophys. J. 258, L35.

  13. Wallerstein, G. and Greenstein, J. L.: 1980,Publ. Astron. Soc. Pacific 92, 275.

  14. Wallerstein, G., Willson, L. A., Salzer, J., and Brugel, E. W.: 1984,Astron. Astrophys. 133, 137.

  15. Whitelock, P. A., Feast, M. W., Catchpole, R. M., Carter, B. S., and Roberts, G.: 1983,Monthly Notices Roy. Astron. Soc. 203, 351.

  16. Willson, L. A., Garnvich, P., and Mattei, J. A.: 1981,Inf. Bull. Var. Stars, No. 1961.

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Anandarao, B.G., Sahu, K.C. & Desai, J.N. High-resolution observations of Hα emission line from R Aquarii. Astrophys Space Sci 114, 351–356 (1985).

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  • Radiation
  • Radial Velocity
  • Emission Line
  • Momentum Transfer
  • Line Profile