The gradual acceleration of the outflow of VX-Sagittarii: A stellar evolutionary effect?
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VX-Sagittarii is a red supergiant with a superwind which is observed in several maser lines. They provide an evidence that the outflow velocity keeps growing considerably at large distance from the star. It is argued that this phenomenon can be explained by stellar evolutionary effects.
As a rule, the outflow velocity for late type stars correlates with the mass loss rate and from that it is suggested that the mass loss rate was higher in the past and is decreasing now. The mass of VX Sagittarii can be estimated on this basis and is about 40–50M⊙
KeywordsMass Loss Loss Rate Large Distance Late Type Evolutionary Effect
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- Bowers, P. F. and Johnston, K. J.: 1990,Ap. J. 354, 676Google Scholar
- Chapman, J. M. and Cohen, R. J.: 1986,M.N.R.A.S. 220, 513Google Scholar
- Goldreich, P. and Scoville, N.: 1976,Ap. J. 205, 144Google Scholar
- Knapp, G. R., Sutin, B. M., Phillips, T. G., Ellison, B. N., Keene, J. B., Leighton, R. B., Masson, C. R., Steiger, W., Veidt, B. and Young, K.: 1989,Ap. J. 336, 822Google Scholar
- Humphreys, R. W., Strecker, D. W. and Ney, E. P.: 1972,Ap. J. 172, 75Google Scholar
- Netzer, N.: 1989,Ap. J. 342, 1068Google Scholar
- Netzer, N. and Elitzur, M.: 1993,Ap. J. 410, 701Google Scholar