Abstract
New photoelectric times of maximum light of the large amplitude SX Phoenicis star CY Aquarii are analyzed together with times of maximum light in the literature. The general shape of the fitted curve of the observed minus calculated (O-C) times of maximum light suggest the duplicity of the variable star, which causes long-term period variations in the light-time. The period changes of CY Aqr are probably consequences of a continuously increasing period combined with the light-time effect in a binary system. The secondary companion is less massive. Some spectroscopic orbital elements are derived from the O-C diagram.
Similar content being viewed by others
References
Ashbrook, J.: 1954, Astron. J. 59, 6.
Barnes, T.G. and Moffett, T.J.: 1975, Astron. J. 80, 48.
Bohusz, E. and Udalski, A.: 1980, Acta Astron. 30, 359.
Breger M.: 1990, Comm. Asteroseismology 20, Austrian Acad. Sciences, Vienna.
Coates, D.W., Fernley, J.A., Sekiguchi, K., Barnes, T.G. and Frueh, M.L.: 1994, Mon. Not. R. Astron. Soc. 266, 1.
Elst, E.W.: 1972, Astron. Astrophys. 17, 148.
Fitch, W.S.: 1973, Astron. Astrophys. 27, 261.
Fu, J.-N., Jiang, S.-Y. and Liu, Y.-Y.: 1994, Inf. Bull. Variable Stars, 3970.
Garrido, R., Alfaro, E. J., Quintana, J. M. and Saez, M. 1979, A&AS, 36, 51
Hoffmeister, C. 1934, Beobachtungszirkular Anac Kiel., 16, 45
Joner, M. D., and Powell, J.M. 1993, in New Perspectives on Stellar Pulsation and Pulsating Variable Stars, IAU Colloquium No. 139, ed. J. M. Nemec and J. M. Matthews, p. 428
Kämper, B.-C.: 1985, Inf. Bull. Variable Stars, 2802.
Mahdy, H.A. and Szeidl, B.: 1980, Mitteilungen der Sternwarte Budapest, 74.
Mahdy, H.A., Soliman, M.A. and Hamdy, M.A.: 1988, Inf. Bull. Variable Stars, 3276.
McNamara, D.H., Powell, J.M. and Joner, M.D.: 1996, Publ. Astron. Soc. Pacific 108, 1098
Peña, J.H., Peniche, R. and Hobart, M.A.: 1985, Inf. Bull. Variable Stars, 2672.
Percy, R.J., Mattews, J.M. and Wade, J.D.: 1980, Astron. Astrophys. 82, 172.
Percy, H.R.: 1975, Astron. Astrophys. 43, 469.
Powell, J.M., Joner, M.D. and McNamara, D.H.: 1995, Publ. Astron. Soc. Pacific 107, 225.
Rodríguez, E., López de Coca, P., Costa, V. and Martin, S.: 1995, Astron. Astrophys. 299, 108.
Rodríguez, E., Rolland, A., López de Coca, P. and Martin, S.: 1996, Astron. Astrophys. 307, 539.
Rolland, A., Peña, J.H., López de Coca, P., Peniche, R. and Gonzalez, S.F.: 1986, Astron. Astrophys. 168, 125.
Simen, N.R.: 1979, Astron. Astrophys. 75, 140.
Zissell, R.: 1968, Astron. J. 73, 696.
Zissell, R.: 1991, Abstracts J. AAVSO 20, 251.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Zhou, AY., Fu, JN. & Jiang, SY. The Duplicity of Large Amplitude SX Phoenicis Star CY Aquarii. Astrophysics and Space Science 268, 397–406 (1999). https://doi.org/10.1023/A:1002022403694
Issue Date:
DOI: https://doi.org/10.1023/A:1002022403694