Abstract
Radial velocity observations with an accuracy of about 0.5 km s-l have been obtained over the last five years for samples of strong CN, BaII, CH, sgCH, and R stars. These data indicate that those stars that exhibit excesses of s process elements as well as carbon, the Ball and CH stars, are probably all binary systems. Those stars, on the other hand, that show no excess of s process elements, the strong CN and R stars, show the normal binary frequency for K giants. These results are discussed in terms of possible mixing scenerios. The most popular explanation for the Ball and CH stars is that their atmospheres were contaminated by material transferred from a previously more massive companion, although this hypothesis has several formidable problems. The R stars, on the other hand have probably mixed at the helium core flash.
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References
Bidelman, W.P., and Keenan, P.C. 1951, Ap. J., 114, 473.
Böhm-Vitense, E. 1980, Ap. J. (Letters), 239, L79.
Böhm-Vitense, E., Nemec, J., and Proffitt, C. 1984, Ap. J., 278, 726.
Bond, H.E. 1974, Ap. J., 194, 95.
Branch, D., Bonnell, J., and Tomkin, J. 1978, Ap. J., 225, 902.
Dominy, J.F. 1984, Ap. J. Suppl., 55, 27.
Dominy, J.F., and Lambert, D.L. 1983, Ap. J., 270, 180.
Eggen, O.J. 1972, M.N.R.A.S., 159, 403.
Fletcher, J.M., Harris, H.C., McClure, R.D., and Scarfe, C.D. 1982, Pub. A.S.P., 94, 1017
Griffin, R.F. 1967, Ap. J., 148, 465.
Griffin, R.F. 1982, Observatory, 102, 82.
Harris, H.C., and McClure, R.D. 1983, Ap. J. (Letters), 265, L77.
Harris, W.E., and Racine, R. 1979, Ann. Rev. Astr. Ap., 17, 241.
Iben, I. Jr. 1975, Ap. J., 196, 525.
Janes, K.A. 1975, Ap. J. Suppl., 29, 161.
Keenan, P.C. 1942, Ap. J., 96, 101.
Luck, R.E., and Bond, H.E. 1982, Ap. J., 259, 792.
MacConnell, D.J., Frye, R.L., and Upgren, A.R. 1972, A.J., 77, 384.
McClure, R.D. 1970, A.J., 75, 41.
McClure, R.D. 1983, Ap.J., 268, 264.
McClure, R.D. 1984, Pub. A.S.P., 96, 117.
McClure, R.D., and Forrester, W.T. 1982, Pub. Pom. Str. Obs., 15, 439.
McClure, R.D., Forrester, W.T. and Gibson, J. 1974, Ap. J., 189, 409.
McClure, R.D., Norris, J. 1977, Ap. J. (Letters), 216, L101.
Pinsonneault, M.H., Sneden, C., and Smith, V.V. 1984, Pub. A.S.P., 96, 239.
Roman, N.G. 1952, Ap. J., 116, 122.
Scalo, J.M. 1978, Ap. J., 221, 627.
Schmitt, J.L. 1971, Ap. J., 163, 75.
Smith, V.V. 1984, Astr. Ap., 132, 326.
Sneden, C., Lambert, D.L., and Pilachowski, C.A. 1982, Ap. J., 247, 1052.
Tomkin, J., and Lambert, D.L., 1979, Ap. J., 227, 209.
Trimble, V. 1984, submitted to Nature.
Truran, J.W., and Iben, I. Jr. 1977, Ap. J., 216, 797.
Warner, B. 1965, M.N.R.A.S., 129, 263.
Yamashita, Y. 1972, Ann. Tokyo Astr. Obs., 13, 169.
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© 1985 D. Reidel Publishing Company, Dordrecht, Holland
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McClure, R.D. (1985). Binary Systems Among the Peculiar Cool Stars. In: Jaschek, M., Keenan, P.C. (eds) Cool Stars with Excesses of Heavy Elements. Astrophysics and Space Science Library, vol 114. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5325-3_41
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DOI: https://doi.org/10.1007/978-94-009-5325-3_41
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