Abstract
Variations in the magnetic pressure and flux blocking by starspots during the magnetic cycle of the cool semidetached component of an Algol binary may cause cyclic changes in the quadrupole moment and moment of inertia of the star which can cause alternate period changes. Since several different processes and timescales are involved, the orbital period changes may not correlate strongly with the indicators of magnetic activity. The structural changes in the semidetached component can also modulate the mass transfer rate. Sub-Keplerian velocities, supersonic turbulence, and high temperature regions in circumstellar material around the accreting star may all be a consequence of magnetic fields embedded in the flow. Models for the evolution of Algols which include the effects of angular momentum loss (AML) through a magnetized wind may have underestimated the AML rate by basing it on results from main sequence stars. Evolved stars appear to have higher AML rates, and there may be additional AML in a wind from the accretion disk.
Similar content being viewed by others
References
Applegate, J. H., and Patterson, J. 1987, Ap. J. (Letters), 322, L99.
Baliunas, S. L., and Vaughan, A. H. 1985, Ann. Rev. Astr. Ap., 23, 379.
Belcher, J. W., and MacGregor, K. B. 1976, Ap. J., 210, 498.
Biermann, P., and Hall, D. S. 1973, Astr. Ap., 27, 239.
Cannizzo, J. K., and Pudritz, R. E. 1988, Ap. J., 327, 840.
Dearborn, D. S. P., and Blake, J. B. 1982, Ap. J., 257, 896.
Dorren, J. D., and Guinan, E. F. 1984, in Cool Stars, Stellar Systems and the Sun, Baliunas, S. L., and Hartmann, L., (eds.), (New York: Springer), 259.
Dorren, J. D., Guinan, E. F., and Wacker, S. W. 1986, New Insights in Astrophysics, ESA SP-263, 201.
Dulk, G. A. 1985, Ann. Rev. Astr. Ap., 23, 169.
Endal, A. S., and Twigg, L. W. 1982, Ap. J., 260, 342.
Endal, A. S., Sofia, S., and Twigg, L. W. 1985, Ap. J., 290, 748.
Gilliland, R. L. 1981, Ap. J., 248, 1144.
Giuricin, G., Mardirossian, F., and Mezzetti, M. 1983, Ap. J. Suppl., 52, 35.
Gray, D. F. 1982, Ap. J., 262, 682.
Gray, D. F.. 1985, Ap. J., 298, 756.
Hadrava, P. 1984, Bull. Astr. Inst. Czech., 35, 335.
Hall, D. S. 1975, Acta Astr., 25, 1.
Hall, D. S. 1987, Pub. Astr. Inst. Czech. Acad. Sci., 70, 77.
Hall, D. S. 1988, these proceedings.
Hall, D. S., and Kreiner, J. M. 1980, Acta Astr., 30, 387.
Kaitchuck, R. H. 1988, these proceedings.
Kondo, Y., McCluskey, G. E., and Stencel, R. E. 1960, in Close Binary Stars: Observations and Interpretation, Plavec, M. J., Popper, D. M., and Ulrich, R. K., (eds.), New York: Springer, 237.
Kraicheva, Z. T., Tutukov, A. V., and Yungel'son, L. R. 1986, Astrophys., 24, 167.
Lestrade, J.-F., Mutel, R. L., Preston, R. A., and Phillips, R. B. 1986, in Cool Stars, Stellar Systems and the Sun, Zeilik, M., and Gibson, D. M., (eds.), New York: Springer, 135.
Little-Marenin, I. R., Simon, T., Ayres, T. R., Cohen, N. L., Feldman, P. A., Linsky, J. L., Little, S. J., and Lyons, R. 1986, Ap. J., 303, 780.
Lubow, S. H., and Shu, F. H. 1975, Ap. J. 198, 383.
Matese, J. J., and Whitmire, D. P. 1983, Astr. Ap., 117, L7.
Mochnacki, S. W. 1981, Ap. J., 245, 650.
Mutel, R. L., Morris, D. H., Doiron, D. J., and Lestrade, J.-F. 1987, A. J., 93, 1220.
Olson, E. C. 1985, in Interacting Binaries, Eggleton, P. P., and Pringle, J. E., eds., [Dordrecht: Reidel], 127.
Olson, E. C. 1988, these proceedings.
Peters, G. J. 1988, these proceedings.
Peters, G. J., and Polidan, R. S. 1984, Ap. J., 283, 745.
Plavec, M. J. 1983, Ap. J., 275, 251.
Plavec, M. J. 1988, these proceedings.
Richards, M. T., Bolton, C. T., and Mochnacki, S. W. 1988, these proceedings.
Rosner, R., Golub, L., and Vaiana, G. S. 1985, Ann Rev. Astr. Ap., 23, 413.
Rucinski, S. 1988, private communication.
Spruit, H. C., and Ritter, H. 1983, Astr. Ap., 124, 267.
Stepinski, T. F., and Levy, E. H. 1988, Ap. J., 331, 416.
Tassoul, J.-L. 1987, Ap. J., 322, 856.
Tassoul, J.-L. 1988, Ap. J. (Letters), 324, L71.
Tutukov, A. V. 1984, Astrophys., 21, 671.
Van Buren, D., and Young, A. 1985, Ap. J. (Letters), 295, L39.
Yungel'son, L. R. 1988, these proceedings.
Zahn, J.-P. 1977, Astr. Ap., 57, 383.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Bolton, C.T. The effects of magnetic fields on period changes, mass transfer and evolution of algol binaries. Space Sci Rev 50, 311–322 (1989). https://doi.org/10.1007/BF00215940
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00215940