Abstract
The evolutionary status of a sample of 31 W UMa-type systems (20 of W, 9 of A, and 2 of A/W sub-class) is examined and discussed on the basis of their positions in the H-R, mass-radius and mass-luminosity diagrams. The absolute elements of these systems have been evaluated by use of their spectroscopic and photometric data as they were found in the literature. Since different analysis methods have been used by the various investigators this gives the opportunity to make different H-R, mass-radius and mass-luminosity diagrams, according to the method used, and compare the results.
Moreover, from the spectral type-period diagram of those systems that have spectral types from O to G2 it was found that all of them lie in the evolved region. Finally, the log (L l/L s) log (M l/M s) diagrams are presented and discussed.
Similar content being viewed by others
References
Allen, C. W.: 1976,Astrophysical Quantities, The Athlone Press, London.
Binnendijk, L.: 1970,Vistas Astron. 12, 217.
Iben, I. J.: 1967,Ann. Rev. Astron. Astrophys. 5, 571.
Jabbar, S. R. and Kopal, Z.: 1983,Astrophys. Space Sci. 92, 99.
Kaluzny, J.: 1985,Acta Astron. 35, 327.
Kopal, Z.: 1955,Ann. Astrophys. 18, 427.
Kopal, Z. and Shapley, M. B.: 1956,Jodrell Bank Ann. 1, 141.
Leung, K.-C. and Schneider, D. P.: 1978,Astrophys. J. 222, 917.
Lucy, L. B.: 1968,Astrophys. J. 153, 877.
Lucy, L. B.: 1973,Astrophys. Space Sci. 22, 381.
Maceroni, C., Milano, L., and Russo, G.: 1982,Astron. Astrophys. Suppl. Ser. 49, 123.
Mauder, H.: 1972,Astron. Astrophys.,17, 1.
Mochnacki, S. W.: 1981,Astrophys. Suppl. Ser. 245, 650.
Mochnacki, S. W. and Doughty, N. A.: 1972,Monthly Notices Roy. Astron. Soc.,156, 51.
Rovithis-Livaniou, H., Niarchos, P. G., and Rovithis, P.: 1990, in C. Ibanoglu (ed.),Active Close Binaries, Mathematical and Physical Sciences, Vol. 319, Kluwer Academic Publishers. p. 253.
Van Hamme, W.: 1982,Astron. Astrophys. 116, 27.
Webbink, R. F.: 1977a,Astrophys. J. 211, 486.
Webbink, R. F.: 1977b,Astrophys. J. 215, 851.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Rovithis-Livaniou, H., Rovithis, P. & Bitzaraki, O. Evolutionary state of W UMa-type systems. Astrophys Space Sci 189, 237–262 (1992). https://doi.org/10.1007/BF00643128
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00643128