Abstract
The (in many respects, similar) classical Algol-type eclipsing binary systems U Sge and U Cep are studied and compared against a background of photometric evidence, both broadhand and narrowband. Broadband photometry of the primary minimum of U Sge over a four year period fails clearly to confirm Olson's (1982b) finding of radial variations.
On the other hand, the ‘W’-type pattern of variation indicated in Olson's (1976) Hβ photometry of the primary eclipse of U Cep is also noticed for U Sge. These effects are analysed in terms of an emitting accretion disk, surrounding the primary components. Electron densities in these highly ionized structures are derived to be in the range 1010–1011, for the Hβ emitting region, with that of U Cep being 3 times greater than that of U Sge, though since the volume of the structure is 3 times bigger for U Sge, the overall masses are comparable.
These findings can be placed in a ‘Case B’-type interacting binary context, which shows the studied accretion structures to be relatively tenuous; and, since the mean mass loss rate for U Cep is likely to be high than that of U Sge by more than an order of magnitude, suggests they are not so directly dependent on this mass-loss rate.
Similar content being viewed by others
References
Allen, C. W.: 1973,Astrophysical Quantities (3rd ed.), Athlone Press, London.
Awadalla, N. S. and Budding, E.: 1982, in Z. Kopal and J. Rähe (eds.), ‘Binary and Multiple Stars as Tracers of Stellar Evolution’,IAU Colloq. 69, 239.
Batten, A. H.: 1973,Binary and Multiple Systems of Stars, Pergamon Press, London.
Batten, A. H.: 1974,Publ. Dominion Astrophys. Obs. Victoria 14, 191.
Batten, A. H.: 1981, in E. B. Carling and Z. Kopal (eds.),Photometric and Spectroscopic Binary Systems, R. Reidel Publ. Co., Dordrecht, Holland, p. 465.
Batten, A. H., Fisher, W. A., Baldwin, B. W., and Scarfe, C. D.: 1975,Nature 253, 174.
Biermann, P. and Hall, D. S.: 1973,Astron. Astrophys. 27, 249.
Budding, E.: 1980, in M. J. Plavec, D. M. Popper, and R. K. Ulrich (eds.), ‘Close Binary Stars: Observations and Interpretation’,IAU Symp. 88, 299.
Budding, E.: 1981, in E. B. Carling and Z. Kopal (eds.),Photometric and Spectroscopic Binary Systems, D. Reidel Publ. Co., Dordrecht, Holland, p. 473.
Budding, E.: 1984,Bull. Inf. Centre Données Stellaires 27, 91.
Budding, E. and Marngus, N.: 1980,Astrophys. Space Sci. 67, 477.
Budding, E. and Najim, N. N.: 1980,Astrophys. Space Sci. 72, 369.
Byrd, P. F. and Friedman, M. D.: 1971,Handbook of Elliptic Integrals for Engineers and Scientists, Springer-Verlag, Berlin.
Carpenter, E. F.: 1930,Astrophys. J. 72, 205.
Cester, B. and Pucillo, M.: 1972,Mem. Soc. Astron. Ital. 43, 501.
Cox, D. P. and Tucker, W. H.: 1969,Astrophys. J. 157, 1157.
Crawford, D. L.: 1958,Astrophys. J. 128, 190.
Dalgarno, A. and McCray, R. A.: 1972,Ann. Rev. Astron. Astrophys. 10, 375.
Dobiáŝ, J. J. and Plavec, M. J.: 1985,Publ. Astron. Soc. Pacific 97, 138.
El Bassuny Alway, A.: 1981, M.Sc. Thesis. University of Manchester (unpublished).
Hall, D. S. and Keel, W. C.: 1977,Acta Astron. 27, 167.
Harris, D. L.: 1963, in K. Strand (ed.)Basic Astronomical Data, Chicago Univ. Press, Chicago, p. 263.
Kadouri, T. H.: 1982, Ph.D. Thesis, University of Manchester (unpublished).
Kaitchuck, R. H. and Honeycutt, R. K.: 1983,Proceedings of Workshop on Interacting Binary Stars, Cambridge Univ. Press, Cambridge, preprint.
Khan, R. M. A.: 1982, private communication.
Khan, R. M. A.: 1984, Ph.D. Thesis, University of Manchester (unpublished).
Kopal, Z.: 1947, Harvard Obs. Circ. No. 450.
Kopal, Z.: 1979,Language of the Stars, D. Reidel Publ. Co., Dordrecht, Holland.
Kopal, Z.: 1981, in E. B. Carling and Z. Kopal (eds.),Photometric and Spectroscopic Binary Systems, D. Reidel Publ. Co., Dordrecht, Holland.
Kreiner, J. M. and Ziołkowski, J.: 1978,Acta Astron. 28, 497.
Kukarkin, B. V., Khopolov, P. N., Efremev, Y. N., Kukarkina, N. P., Kurochkin, N. E., Medvedeva, G. I., Perova, N. B., Fedorovich, V. P., and Frolov, M. S.: 1969,General Catalogue of Variable Stars, Vol. I, 3rd ed. + Vol. II 1970, Moscow.
Lubow, S. H. and Shu, F. H.: 1975,Astrophys. J. 198, 383.
Marngus, N.: 1979, M.Sc. Thesis, University of Manchester (unpublished).
McNamara, D. H.: 1951,Publ. Astron. Soc. Pacific 63, 38.
McNamara, D. H. and Feltz, K. A. Jr.: 1976,Publ. Astron. Soc. Pacific 88, 688.
Naftilan, S. A.:Bull. Am. Astron. Soc. 7, 476.
Olson, E. C.: 1976,Astrophys. J. 204, 141.
Olson, E. C.: 1978,Astrophys. J. 220, 251.
Olson, E. C.: 1980a,Astrophys. J. 237, 496.
Olson, E. C.: 1980b,Astrophys. J. 241, 257.
Olson, E. C.: 1982a,Astrophys. J. 259, 702.
Olson, E. C.: 1982b,Publ. Astron. Soc. Pacific 94, 70.
Olson, E. C.: 1984,Publ. Astron. Soc. Pacific 96, 576.
Olson, E. C.: 1983,Proceedings of Workshop on Interacting Binary Stars, Cambridge Univ. Press, Cambridge (to appear).
Parthasarathy, M., Lambert, D. L., and Tomkin, J.: 1979,Monthly Notices Roy. Astron. Soc. 186 391.
Parthasarathy, M., Lambert, D. L., and Tomkin, J.: 1983,Montly Notices Roy. Astron. Soc. 203, 1063.
Peters, G. J. and Polidan, R. S.: 1984,Astrophys. J. 283, 745.
Plavec, M.: 1968,Bull. Astron. Inst. Czech. 19, 11.
Plavec, M.: 1980, in M. J. Plavec, D. M. Popper, and R. K. Ulrich (eds.), ‘Close Binary Stars: Observations and Interpretation’,IAU Symp. 88, 299.
Plavec, M.: 1983,Astrophys. J. 275, 251.
Popper, D. M.: 1980,Ann. Rev. Astron. Astrophys. 18, 137.
Prendergast, K. H. and Taam, R. E.: 1974,Astrophys. J. 189, 125.
Raymond, J. C., Cox, D. P., and Barham, W. S.: 1976,Astrophys. J. 204, 290.
Redman, R. O.: 1936,Monthly Notices Roy. Astron. Soc. 96, 488.
Sahade, J. and Wood, F. B.: 1978,Interacting Binary Stars, Pergamon Press, London.
Struve, O.: 1949,Monthly Notices Roy. Astron. Soc. 109, 487.
Tomkin, J.: 1979,Astrophys. J. 231, 495.
Tomkin, J.: 1981,Astrophys. J. 244, 546.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Khan, M.A., Budding, E. Photometry and discussion of the classical Algol systems U Sge and U Cep. Astrophys Space Sci 125, 219–242 (1986). https://doi.org/10.1007/BF00648024
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00648024