Abstract
The observed spin periods of the primaries in intermediate polars require the presence of torques additional to the standard expectation of material and magnetic torques from an accretion disc. In an extension of earlier work by Wickramasinghe, Wu and Ferrario, from rates of mass transfer deduced from optical and X-ray fluxes, and assuming surface magnetic fields similar to those observed in the most rapidly rotating low mass main sequence stars, it is shown that the magnetohydrodynamic torque between the partially shielded primary and the secondary is sufficient to account for the observed spin periods. It is further found that there is a range of magnetic moments and mass transfer rates in which synchronized rotation of the primary can occur even though it possesses an accretion disc. This may account for the structures deduced for V795 Her and V2051 Oph.
An analysis of the observed outbursts (or lack of) in the intermediate polars shown that wheres many systems are explainable in terms of the standard theory of α-discs, in some systems the magnetic structure is supressing expected outbursts and instabilities that are as yet not understood appear in their place.
Similar content being viewed by others
References
Angelini, L. and Verbunt, F.: 1989,Mon. Not. R. Astron. Soc. 238, 697.
Baptista, R., Jablonski, F.J., Cieslinski, D. and Steiner, J.E.: 1993,Astrophys. J. 406, L67.
Baptista, R., Steiner, J.E. and Cieslinski, D.: 1994,Astrophys. J. 433, 332.
Bateson, F.M.: 1979,Int. Astr. Union Symp. 46, 89.
Belserene, E.P.: 1981,Bull. Am. Astron. Soc. 13, 524.
Beuermann, K. and Burwitz, V.: 1995,Astron. Soc. Pacific Conf. Ser. 85, 99.
Beuermann, K., Thorstensen, J.R., Schwope, A.D., Ringwald, F. and Sahin, H.: 1992,Astron. Astrophys. 256, 442.
Bianchini, A., Sabbadin, F. and Hamzaoglu, E.: 1982,Astron. Astrophys. 106, 176.
Buckley, D. and Schwarzenberg-Czerny, A.: 1993, in: O. Regev and G. Shaviv (eds.),Cataclysmic Variables and Related Physics, Inst. Phys. Publ., Bristol, p. 178.
Buckley, D.A.H. and Shafter, A.W.: 1995,Mon. Not. R. Astron. Soc. 275, L61.
Buckley, D.A.H., Sekiguchi, K., O'Donoghue, D., Chen, A.-L., Motch, C. and Haberl, F.: 1995,Astron. Soc. Pacific Conf. Ser. 85, 248.
Campbell, C.G.: 1985,Mon. Not. R. Astron. Soc. 215, 509.
Cannizzo, J.: 1993, in: J.C. Wheeler (ed.),Accretion Disks in Compact Stellar Systems, World Sci. Publ., Singapore, p. 6.
Cannizzo, J., Shafter, A.W. and Wheeler, J.C.: 1988,Astrophys. J. 333, 227.
Casares, J., Martinez-Pais, I.G., Marsh, T.R., Charles, P.A. and Lázaro, 1996,Mon. Not. R. Astron. Soc. 278, 219.
Chanmugam, G., Frank, J., King, A.R. and Lastoa, J.-P.: 1990,Astrophys. J. 350, L13.
Davidson, K. and Ostriker, J.P.: 1973,Astrophys. J. 179, 585.
de Martino, D., Buckley, D.A.H., Mouchet, M. and Mukai, K.: 1994,Astron. Astrophys. 284, 125.
Dhillon, V.S., Jones, D.H.P. and Marsh, T.R.: 1994,Mon. Not. R. Astron. Soc. 266, 859.
Dhillon, V.S., Marsh, T.R. and Jones, D.H.P.: 1991,Mon. Not. R. Astron. Soc. 252, 342.
Ferrario, L., Wickramasinghe, D.T. and King, A.R.: 1993,Mon. Not. R. Astron. Soc. 260, 149.
Garnavich, P.M. and Szkody, P.: 1988,Publ. Astron. Soc. Pacific 100, 1522.
Ghosh, P. and Lamb, F.K.: 1978,Astrophys. J. 223, L83.
Ghosh, P. and Lamb, F.K.: 1979a,Astrophys. J. 234, 296.
Ghosh, P. and Lamb, F.K.: 1979b,Astrophys. J. 232, 259.
Ghosh, P., Lamb, F.K. and Pethick, C.J.: 1977,Astrophys. J. 217, 578.
Harrop-Allin, M.K. and Warner, B.: 1996,Mon. Not. R. Astron. Soc. 279, 219.
Hazen, M.: 1985,Inf. Bull. Var. Stars, No. 2880.
Hellier, C.: 1992,Mon. Not. R. Astron. Soc. 258, 578.
Hellier, C.: 1993a,Mon. Not. R. Astron. Soc. 265, L35.
Hellier, C.: 1993b, in: O. Regev and G. Shaviv (eds.),Cataclysmic Variables and Related Physics, Inst. Phys. Publ., Bristol, p. 205.
Hellier, C.: 1993c,Mon. Not. R. Astron. Soc. 264, 132.
Hellier, C.: 1995,Astron. Soc. Pacific Conf. Ser. 85, 185.
Hellier, C. and Buckley, D.: 1993,Mon. Not. R. Astron. Soc. 265, 766.
Hellier, C., Cropper, M. and Mason, K.O.: 1991,Mon. Not. R. Astron. Soc. 248, 233.
Hellier, C., Mason, K.O. and Cropper, M.S.: 1989,Mon. Not. R. Astron. Soc. 237, 39P.
Hellier, C., Mason, K.O., Rosen, S.R. and Cordova, F.A.: 1987,Mon. Not. R. Astron. Soc. 228, 463.
Hellier, C., et al.: 1989,Mon. Not. R. Astron. Soc. 238, 1107.
Hellier, C., Ringwald, F.A. and Robinson, E.L.: 1994,Astron. Astrophys. 289, 148.
Hessman, F.V. and Hopp, U.: 1990,Astron. Astrophys. 228, 387.
Horne, K., Welsh, W.F. and Wade, R.A.: 1993,Astrophys. J. 410, 357.
Hudec, R.: 1984,Bull. Astron. Inst. Czech. 35, 203.
Johns-Krull, C.M. and Valenti, J.: 1996,Astrophys. J. 459, L95.
Kaitchuck, R.H., Schlegel, E.M., Honeycutt, R.K., Marsh, T.R., White, J.C. and Mansperger, C.S.: 1994,Astrophys. J. Suppl. 93, 519.
King, A.R. and Watson, M.G.: 1987,Mon. Not. R. Astron. Soc. 277, 205.
Kley, W.: 1991,Astron. Astrophys. 247, 95.
Kovetz, A., Prialnik, D. and Shara, M.M.: 1988,Astrophys. J. 325, 828.
Kuijpers, J. and Pringle, J.E.: 1982,Astron. Astrophys. 114, L4.
la Dous, C.: 1989,Mon. Not. R. Astron. Soc. 238, 935.
Lamb, D.Q.: 1988, in: G.V. Coyneet al. (eds.),Polarized Radiation of Circumstellar Origin, Vatican Obs. p. 151.
Lamb, D.Q. and Melia, F.: 1988, in G.V. Coyneet al. (eds.),Polarized Radiation of Circumstellar Origin, Vatican Obs. p. 45.
Lamb, F.K., Aly, J.-J., Cook, M.C. and Lamb, D.Q.: 1983,Astrophys. J. 274, L71.
Li, X.-D. and Wang, Z.-R.: 1996,Astron. Astrophys. 307, L5.
Livio, M. and Pringle, J.: 1992,Mon. Not. R. Astron. Soc. 259, 23P.
Long, K.S.: 1993, in: O. Regev and G. Shaviv (eds.),Cataclysmic Variables and Related Physics, Inst. Phys. Publ., Bristol, p. 24.
Long, K.S., Blair, W.P. and Raymond, J.C.: 1995,Astrophys. J. 454, L39.
Long, K.S., Wade, R.A., Blair, W.P., Davidsen, A.F. and Hubeny, I.: 1994,Astrophys. J. 426, 704.
Ludwig, Meyer-Hofmeister, E. and Meyer, F.: 1994,Astron. Astrophys. 290, 473.
Mason, K.O.: 1995, Astr. Soc. Pacific Conf. Ser.85, 225.
Mouchet, M.: 1993, in: M.A. Barstow (ed.),White Dwarfs: Advances in Theory and Observation, Kluwer, Dordrecht, p. 411.
Mukai, K. and Shiokawa, K.: 1993,Astrophys. J. 418, 863.
Nauenberg, M.: 1972,Astrophys. J. 175, 417.
Norton, A.J. and Watson, M.G.: 1989,Mon. Not. R. Astron. Soc. 237, 715.
Osaki, Y.: 1996,Publ. Astron. Soc. Pacific 108, 39.
Osborne, J.P., Beuermann, K., Charles, P., Maraschi, L., Mukai, K. and Treves, A.: 1987,Astrophys. J. 315, L123.
Paczynski, B.: 1977,Astrophys. J. 216, 822.
Patterson, J.: 1984,Astrophys. J. Suppl. 54, 443.
Patterson, J.: 1994,Publ. Astron. Soc. Pacific 106, 209.
Patterson, J. and Raymond, J.C.: 1985,Astrophys. J. 292, 535.
Patterson, J., Schwartz, D.A., Pye, J.P., Williams, G.A. and Caillault, J.-P.: 1992,Astrophys. J. 392, 233.
Piirola, V., Hakala, P. and Coyne, G.V.: 1993,Astrophys. J. 410, L107.
Pringle, J.E. and Rees, M.J.: 1972,Astron. Astrophys. 21, 1.
Reinsch, K. and Beuermann, K.: 1990,Astron. Astrophys. 240, 360.
Remillard, R.A., Bradt, H.V., Bissenden, R.J.V., Buckley, D.A.H., Schwartz, D.A., Silber, A., Stroozar, B.A. and Tuohy, I.R.: 1994,Astrophys. J. 428, 785.
Robinson, E.L. and Zhang, E.: 1995,Astron. Soc. Pacific Conf. Ser. 85, 411.
Rutten, R.G.M., van Paradijs, J. and Tinbergen, J.: 1992,Astron. Astrophys. 260, 213.
Saar, S.H.: 1990,Int. Astron. Union Symp. 138, 427.
Sabbadin, F. and Bianchini, A.: 1983,Astron. Astrophys. Suppl. 54, 393.
Schmidt, G.D. and Stockman, H.S.: 1991,Astrophys. J. 371, 749.
Schmidt, G.D., Liebert, J. and Stockman, H.S.: 1995,Astrophys. J. 441, 414.
Schwarz, H.E., van Amerongen, S.F., Heemskerk, M.H.M. and van Paradijs, J.: 1988,Astron. Astrophys. 202, L16.
Shakura, N.I. and Sunyaev, R.A.: 1973,Astron. Astrophys. 24, 337.
Skumanich, A. and MacGregor, K.: 1986,Adv. Sp. Res. 6, 151.
Still, M.D., Dhillon, V.S. and Jones, D.H.P.: 1995,Mon. Not. R. Astron. Soc. 273, 849.
Szkody, P. and Mateo, M.: 1984,Astrophys. J. 280, 729.
Thorstensen, J.R., Ringwald, F.A., Wade, R.A., Schmidt, G.D. and Nosworthy, J.E.: 1991,Astron. J. 102, 272.
van Amerongen, S. and van Paradijs, J.: 1989,Astron. Astrophys. 219, 195.
Verbunt, F.: 1984,Mon. Not. R. Astron. Soc. 209, 227.
Verbunt, F.: 1987,Astron. Astrophys. Suppl. 71, 339.
Wang, Y.-M.: 1987,Astron. Astrophys. 183, 257.
Wang, Y.-M.: 1995,Astrophys. J. 449, L153.
Warner, B.: 1987,Mon. Not. R. Astron. Soc. 227, 23.
Warner, B.: 1990,Astrophys. Space Sci. 164, 79.
Warner, B.: 1995a,Cataclysmic Variable Stars, Cambridge University Press, Cambridge.
Warner, B.: 1995b,Astron. Soc. Pacific Conf. Ser. 85, 343.
Warner, B.: 1995c,Astrophys. Space Sci. 226, 187.
Warner, B. and O'Donoghue, D.: 1987,Mon. Not. R. Astron Soc. 224, 733.
Warner, B. and Wickramasinghe, D.T.: 1991,Mon. Not. R. Astron. Soc. 248, 370.
Wenzel, W.: 1983,Mitt. Verand. Sterne 9, 141.
Wickramasinghe, D.T., Wu, K. and Ferrario, L.: 1991,Mon. Not. R. Astron. Soc. 249, 460.
Williams, R.E.: 1989,Astron. J. 97, 1752.
Wood, J.H., Abbott, T.M.C. and Shafter, A.W.: 1992,Astrophys. J. 393, 729.
Wu, K. and Wickramasinghe, D.T.: 1991,Mon. Not. R. Astron. Soc. 252, 386.
Wu, K., Wickramasinghe, D.T. and Warner, B.: 1995,Proc. Astron. Soc. Australia 12, 60.
Zhang, E. and Robinson, E.L.: 1987,Astrophys. J. 321, 813.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Warner, B. Torques and instabilities in intermediate polars. Astrophys Space Sci 241, 263–294 (1996). https://doi.org/10.1007/BF00645229
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00645229