Abstract
The differential velocity field in cool stars can be measured effectively on photographic plates by the use of a PDS micro-densitometer, from which it is shown that radial velocity gradients are larger for stars with larger turbulent velocities, which are determined from the high resolution echellograms. This indicates that the stellar turbulence may have something to do with the differential velocity field in stellar atmospheres. As an observational probe of the mixing processes in red giant stars, stellar abundances that are sensitive to mixing are determined on the basis of high resolution Fourier Transform spectroscopy. For example, the12C/13C ratio has now been determined for large number of red giant stars and shows characteristic changes through the first red giant branch to the asymptotic giant branch, including both the pre-thermal pulsing and the thermal pulsing phases. This information, together with additional information on the16O/17O ratio and on CNO abundances, provides useful constraints on the theory of mixing in red giant stars.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Beckers, S. A. and Iben, I., Jr.: 1979,Astrophys. J. 232, 831.
Connes, P. and Michel, G.: 1974,Astrophys. J. 190, L29.
Dearborn, D. S. P., Lambert, D. L., and Tomkin, J.: 1975,Astrophys. J. 200, 675.
Dearborn, D. S. P., Eggleton, P. P., and Schramm, D. N.: 1976,Astrophys. J. 203, 455.
Dravins, D.: 1975,Astron. Astrophys. 36, 143.
Dravins, D., Lindgren, L., and Nordlund, A.: 1981,Astron. Astrophys. 96, 345.
Edmonds, M. G.: 1978,Astron. Astrophys. 64, 103.
Freeman, K. C. and Norris, J.: 1981,Ann. Rev. Astron. Astrophys. 19, 319.
Fujita, Y. and Tsuji, T.: 1977,Publ. Astron. Soc. Japan 29, 711.
Gray, D. F.: 1981,Astrophys. J. 245, 992.
Gray, D. F.: 1982a,Astrophys. J. 255, 200.
Gray, D. F.: 1982b,Astrophys. J. 262, 682.
Hall, D. N. B., Ridgway, S. T., Bell, E. A. and Yarborough, J. M.: 1979,Proc. Soc. Photo-Opt. Instrum. Eng. 172, 121.
Iben, I., Jr. and Renzini, A.: 1983,Ann. Rev. Astron. Astrophys. 21, 271.
Noguchi, T., Miyauchi, N., and Tsuji, T.: 1981,Tokyo Astron. Obs. Report 19, 452 (in Japanese).
Nordlund, A.: 1980, in D. F. Gray and J. L. Linsky (eds.), ‘Stellar Turbulence’,IAU Colloq. 51, 213.
Osawa, K.: 1965,Astron. Herald 58, 28 (in Japanese).
Pierce, A. K. and Breckinridge, J. B.: 1973,Kitt Peak National Observatory Contr., No. 559.
Ridgway, S. T. and Friel, E. D.: 1981, in C. Chiosi and R. Stalio (eds.),Effects of Mass Loss on Stellar Evolution, D. Reidel, Publ. Co., Dordrecht, Holland, p. 119.
Scalo, J. M., Dominy, J. F., and Pumphrey, W. A.: 1978,Astrophys. J. 221, 616.
Simmons, G. J. and Blackwell, D. E.: 1982,Astron. Astrophys. 112, 209.
Smith, M. A.: 1980,Astrophys. J. 242, L115.
Struve, O. and Elvey, C. T.: 1934,Astrophys. J. 79, 409.
Tomkin, J., Lambert, D. L., and Luck, R. E.: 1975,Astrophys. J. 199, 436.
Tomkin, J., Luck, R. E., and Lambert, D. L.: 1976,Astrophys. J. 210, 694.
Tsuji, T.: 1979,New Zealand J. Sci. 22, 415, (Proc. First Asian-South Pacific Regional Meeting of IAU).
Tsuji, T.: 1981,Astron. Astrophys. 99, 48.
Tsuji, T.: 1985, in M. Jaschek and P. C. Keenan (eds.),Cool Stars with Excesses of Heavy Elements, D. Reidel, Publ. Co., Dordrecht, Holland, p. 295.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Tsuji, T. Turbulence, convection, and mixing in red giant stars: Some empirical approaches based on high resolution spectroscopy. Astrophys Space Sci 118, 227–235 (1986). https://doi.org/10.1007/BF00651130
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00651130