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Evolution of O stars and the WR connection

Published online by Cambridge University Press:  14 August 2015

Peter S. Conti
Peter S. Conti*
Affiliation:
Joint Institute for Laboratory Astrophysics, University of Colorado and National Bureau of Standards, and Department of Astro-Geophysics, University of Colorado, Boulder, CO 80309

Abstract

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The stellar wind mass loss rates of at least some single Of type stars appear to be sufficient to remove much if not all of the hydrogen-rich envelope such that nuclear processed material is observed at the surface. This highly evolved state can then be naturally associated with classic Population I WR stars that have properties of high luminosity for their mass, helium enriched composition, and nitrogen or carbon enhanced abundances. If stellar wind mass loss is the dominant process involved in this evolutionary scenario, then stars with properties intermediate between Of and WR types should exist. The stellar parameters of luminosity, temperature, mass and composition are briefly reviewed for both types. All late WN stars so far observed are relatively luminous like Of stars, and also contain hydrogen. All early WN stars, and WC stars, are relatively faint and contain little or no hydrogen. The late WN stars seem to have the intermediate properties required if a stellar wind is the dominant mass loss mechanism that transforms an Of star to a WR type.

Type
Session 8: Evolutionary Scenario and the WR Connection
Information
Symposium - International Astronomical Union , Volume 83: Mass Loss and Evolution of O-Type Stars , 1979 , pp. 431 - 445
Copyright
Copyright © Reidel 1979 

References

Bappu, M.K.V. and Ganesh, K.S.: 1968, Monthly Notices Roy. Astron. Soc. 140, p. 71.CrossRefGoogle Scholar
Bappu, M.K.V. and Sahade, J., eds.: 1973, Wolf-Rayet and High Temperature Stars (Dordrecht: D. Reidel).CrossRefGoogle Scholar
Beals, C.S.: 1938, Trans. IAU 6, p. 248.Google Scholar
Bohannan, B.: 1979, in Mass Loss and Evolution of O-Type Stars, eds. Conti, P. S. and de Loore, C. (Dordrecht: D. Reidel).Google Scholar
Bohannan, B. and Conti, P.S.: 1976, Astrophys. J. 204, p. 797.CrossRefGoogle Scholar
Bracher, K.: 1967, , .Google Scholar
Breysacher, J. and Azzopardi, M.: 1979, in Mass Loss and Evolution of O-Type Stars, eds. Conti, P.S. and de Loore, C. (Dordrecht: D. Reidel).Google Scholar
Castor, J.I. and Van Blerkom, D.: 1970, Astrophys. J. 161, p. 485.CrossRefGoogle Scholar
Conti, P.S.: 1976, Mem. Soc. Roy. Sci. Liege 9, p. 193.Google Scholar
Conti, P.S.: 1978a, Astron. Astrophys. 63, p. 225.Google Scholar
Conti, P.S.: 1978b, Ann. Rev. Astron. Astrophys. 16 (in press).CrossRefGoogle Scholar
Conti, P.S. and Burnichon, M.-L.: 1974, Astron. Astrophys. 38, p. 467.Google Scholar
Conti, P.S. and Frost, S.A.: 1977, Astrophys. J. 212, p. 728.CrossRefGoogle Scholar
Conti, P.S., Niemela, V.S. and Walborn, N.R.: 1979, Astrophys. J. (in press).Google Scholar
Cowley, A.P., Hiltner, W.H. and Berry, C.: 1971, Astron. Astrophys. 11, p. 407.Google Scholar
Crampton, D.: 1971, Monthly Notices Roy. Astron. Soc. 153, p. 303.CrossRefGoogle Scholar
Ganesh, K.S., Bappu, M.K.V. and Natarijan, V.: 1967, Kodaikanal Obs. Bull. #184.Google Scholar
Hiltner, W.A. and Schild, R.E.: 1966, Astrophys. J. 143, p. 770.CrossRefGoogle Scholar
Hutchings, J.B.: 1976, Astrophys. J. 203, p. 438.CrossRefGoogle Scholar
Hutchings, J.B. and Cowley, A.P.: 1976, Astrophys. J. 206, p. 490.CrossRefGoogle Scholar
Leep, E.M.: 1979, in Mass Loss and Evolution of O-Type Stars, eds. Conti, P.S. and de Loore, C. (Dordrecht: D. Reidel).Google Scholar
de Loore, C., De Greve, J.P. and Van Beveren, D.: 1978, Astron. Astrophys. 67, p. 373.Google Scholar
Massey, P. and Conti, P.S.: 1977, Astrophys. J. 218, p. 431.CrossRefGoogle Scholar
Massey, P. and Conti, P.S.: 1979, in Mass Loss and Evolution of O-Type Stars, eds. Conti, P.S. and de Loore, C. (Dordrecht: D. Reidel).Google Scholar
McClusky, G.E. and Kondo, Y.: 1976, Astrophys. J. 208, p. 760.CrossRefGoogle Scholar
Moffat, A.F.J., Fitzgerald, M.P.M. and Jackson, P.D.: 1977, Astrophys. J. 215, p. 106.CrossRefGoogle Scholar
Moffat, A.F.J. and Seggewiss, W.: 1978, Astron. Astrophys. (in press).Google Scholar
Moffat, A.F.J. and Seggewiss, W.: 1979, in Mass Loss and Evolution of O-Type Stars, eds. Conti, P.S. and de Loore, C. (Dordrecht: D. Reidel).Google Scholar
Morton, D.C.: 1969, Astrophys. J. 158, p. 629.CrossRefGoogle Scholar
Morton, D.C.: 1973, in Wolf-Rayet and High Temperature Stars, eds. Bappu, M.K.V. and Sahade, J. (Dordrecht: D. Reidel), pp. 54–56.CrossRefGoogle Scholar
Niemela, V.S.: 1976, Astrophys. Space Sci. 45, p. 191.CrossRefGoogle Scholar
Niemela, V.S.: 1979, in Mass Loss and Evolution of O-Type Stars, eds. Conti, P.S. and de Loore, C. (Dordrecht: D. Reidel).Google Scholar
Niemela, V.S. and Sahade, J.: 1979, in Mass Loss and Evolution of O-Type Stars, eds. Conti, P.S. and de Loore, C. (Dordrecht: D. Reidel).Google Scholar
Paczynski, B.: 1971, Ann. Rev. Astron. Astrophys. 9, p. 183.CrossRefGoogle Scholar
Paczynski, B.: 1973, in Wolf-Rayet and High Temperature Stars, eds. Bappu, M.K.V. and Sahade, J. (Dordrecht: D. Reidel), pp. 143–152.CrossRefGoogle Scholar
Seggewiss, W.: 1974, Astron. Astrophys. 31, p. 211.Google Scholar
Seggewiss, W. and Moffat, A.F.J.: 1978, Astron. Astrophys. (in press).Google Scholar
Slettebak, A., ed.: 1976, Be and Shell Stars (Dordrecht: D. Reidel).CrossRefGoogle Scholar
Smith, L.F.: 1968a, Monthly Notices Roy. Astron. Soc. 138, p. 109.CrossRefGoogle Scholar
Smith, L.F.: 1968b, Monthly Notices Roy. Astron. Soc. 140, p. 409.CrossRefGoogle Scholar
Smith, L.F.: 1973, in Wolf-Rayet and High Temperature Stars, eds. Bappu, M.K.V. and Sahade, J. (Dordrecht: D. Reidel), pp. 15–35.CrossRefGoogle Scholar
Smith, L.F. and Kuhi, L.V.: 1970, Astrophys. J. 162, p. 535.CrossRefGoogle Scholar
Snow, T.P.: 1979, in Mass Loss and Evolution of O-Type Stars, eds. Conti, P.S. and de Loore, C. (Dordrecht: D. Reidel).Google Scholar
Stempien, K.: 1970, Acta Astron. 20, p. 117.Google Scholar
Struve, O., Sahade, J., Huang, S.-S. and Zebergs, V.: 1958, Astrophys. J. 128, p. 328.CrossRefGoogle Scholar
Underhill, A.B.: 1968, Ann. Rev. Astron. Astrophys. 6, p. 39.CrossRefGoogle Scholar
Underhill, A.B.: 1973, in Wolf-Rayet and High Temperature Stars, eds. Bappu, M.K.V. and Sahade, J. (Dordrecht: D. Reidel), pp. 237–253.CrossRefGoogle Scholar
Walborn, N.R.: 1974, Astrophys. J. 189, p. 269.CrossRefGoogle Scholar
Willis, A.J. and Wilson, R.: 1978, Monthly Notices Roy. Astron. Soc. 182, p. 559.CrossRefGoogle Scholar
Willis, A.J. and Wilson, R.: 1979, in Mass Loss and Evolution of O-Type Stars, eds. Conti, P.S. and de Loore, C. (Dordrecht: D. Reidel).Google Scholar