A Model for Contact Binary EP Andromedae
Davood Manzoori
+ Author Affiliations
- Author Affiliations
Department of Physics, University of Mohaghegh Ardabili, PO Box 179, Ardabil, Iran. Email: d.manzoori@uma.ac.ir
Publications of the Astronomical Society of Australia 29(1) 1-11 https://doi.org/10.1071/AS11003
Submitted: 3 February 2011 Accepted: 4 October 2011 Published: 23 November 2011
Abstract
This paper presents the first comprehensive study of the EP And system, a contact binary. In this work the solution of the standard V light curve was obtained using the phoebe program (version 0.3c). Absolute parameters of the stellar components were then determined, enabling us to discuss the structure and evolutionary status of the close binary EP And. The times of minima data (‘O–C curve’) were analyzed. It was found that a third body with a period of 41.20 yr and mass 0.15 M⊙ is orbiting around the system. Also a modulating period of an 11.72-yr cycle along with a relative period increase of 
were obtained, which were attributed to the magnetic activity cycle and mass transfer with rate 
between the components, respectively.
Keywords: stars: binaries: eclipsing — stars: evolution — stars: individual (EP And)
References
Applegate, J. H., 1992, ApJ, 385, 621| Crossref | GoogleScholarGoogle Scholar |
Biermann, P. and Hall, D. S., 1973, A&A, 27, 249
Binnendijk, L., 1970, , 12, 217
Bradstree, D. H. and Guinan, E. F., 1994, Astronomical Society of the Pacific Conference series, 56, 228
Butters, et al., 2010, , 520, L10
Covas, E., Moss, D. and Tavakol, R., 2005, A&A, 429, 657
| Crossref | GoogleScholarGoogle Scholar |
D'Angelo, C., van Kerkwijk, M. H. & Rucinski, S., 2006, AJ, 132, 650
Filatov, G. S., 1960, ATsir, 215, 20
Flower, P. J., 1996, ApJ, 469, 355
| Crossref | GoogleScholarGoogle Scholar |
Gazeas, K. and Stepien, K., 2008, MNRAS, 390, 1577
Gettel, S. J., Geske, M. T. and McKay, T. A., 2006, AJ, 131, 621
| Crossref | GoogleScholarGoogle Scholar |
Glownia, Z., 2002, AdSpR, 6, 211
Hall, D. S., 1989, SSRV, 50, 219
Hilditch, R. W., 1989, SSRV, 50, 289
Huang, Su. Shu., 1963, ApJ, 138, 417
Huang, R. Q., Song, H. F. and Song, Lan Bi, S., 2007, ChJAA, 7, 235
Kalimeris, A., Livaniou, H. R. and Rovithis, P., 1994, A&A, 282, 775
Kaluzny, J. and Shara, M. M., 1987, ApJ, 314, 585
| Crossref | GoogleScholarGoogle Scholar |
Kolopov, P. N., et al., 1985, General Catalogue of Variable Stars, Vol I (Moscow: Nauka)
Kuiper, G. P., 1941, APJ, 93, 133
| Crossref | GoogleScholarGoogle Scholar |
Kwee, K. and Van Woerden, H. M., 1956, BAN, 12, 327
Lanza, A. F., 2005, MNRAS, 364, 238
| Crossref | GoogleScholarGoogle Scholar |
Lanza, A. F., 2006, MNRAS, 369, 1773
| Crossref | GoogleScholarGoogle Scholar |
Lanza, A. F. and Rodono, M., 2002, A&A, 390, 167
| Crossref | GoogleScholarGoogle Scholar |
Lanza, A. F., Rodono, M. and Ronse, R., 1998, MNRAS, 296, 893
Lanza, A. F., Rodono, M. and Rosner, R., 1999, A&A, 296, 893
Li, L., Han, Z. and Zhang, F., 2004a, MNRAS, 351, 137
| Crossref | GoogleScholarGoogle Scholar |
Li, L., Han, Z. and Zhang, F., 2004b, MNRAS, 355, 1383
| Crossref | GoogleScholarGoogle Scholar |
Li, L., Han, Z. and Zhang, F., 2006, MNRAS, 360, 272
| Crossref | GoogleScholarGoogle Scholar |
Lucy, L. B., 1968, APJ, 151, 1123
| Crossref | GoogleScholarGoogle Scholar |
Lucy, L. B., 1976, APJ, 205, 482
| Crossref | GoogleScholarGoogle Scholar |
Maceroni, C. and Van’t, Veer, 1996, A&A, 311, 523
Manek, J., 1994, IBVS, , 4116
Manzoori, D., 2007, PASA, 24, 1
| Crossref | GoogleScholarGoogle Scholar |
Manzoori, D., 2008, APSS, 318, 57
Manzoori, D., 2009, AJ, 138, 1917
| Crossref | GoogleScholarGoogle Scholar |
Olson, E. C., 1981, ApJ, 250, 704
| Crossref | GoogleScholarGoogle Scholar |
Pribulla, T., Vanko, M. and Parimucha, S., 2001, IBVS, , 5184
Prsa, A. and Zwitter, T., 2005, APJ, 628, 426
| Crossref | GoogleScholarGoogle Scholar |
Prsa, A., Guinan, E. F., Devinney, E. J., De George, M., Bradstreet, D. H., Giammarco, J. M., Alcock, C. R. and Engle, S. G., 2008, APJ, 687, 542
| Crossref | GoogleScholarGoogle Scholar |
Qian, S. and Ma, Y., 2001, PASP, 113, 754
| Crossref | GoogleScholarGoogle Scholar |
Qian, S., Yang, Y., Zhu, L., He, J. and Yuang, J., 2006, ApSS, 304, 25
Qian, S., He, J. J. and Xiang, F. Y., 2008, PASJ, 60, 77
Richards, M. T., 1992, ApJ, 387, 329
| Crossref | GoogleScholarGoogle Scholar |
Richards, M. T., 1993, ApJS, 86, 255
| Crossref | GoogleScholarGoogle Scholar |
Richards, M. T. and Albright, G. E., 1993, ApJS, 88, 199
| Crossref | GoogleScholarGoogle Scholar |
Rucinski, S. V., Pribulla, T. and van Kerkwijk, M. H., 2007, AJ, 134, 2353
| Crossref | GoogleScholarGoogle Scholar |
Rucinski, S. V. and Duerbeck, H. W., 1997, PASP, 109, 1340
| Crossref | GoogleScholarGoogle Scholar |
Siess, L., Dufour, E. and Forestini, M., 2000, A&A, 358, 593
Shu, F. H., Lubow, S. H. and Anderson, L., 1979, AJ, 209, 536
Skumanich, A., 1972, ApJ, 171, 565
| Crossref | GoogleScholarGoogle Scholar |
Song, H. F., Huang, R. Q. and Bi, S. L., 2007, ChJAA, 7, 539
Stepien, K., 1995, MNRAS, 274, 1019
Stepien, K., 2006, AcA, 56, 347
Tokovinin, A., Thomas, S., Sterzik, M. and Udry, S., 2006, A&A, 450, 681
| Crossref | GoogleScholarGoogle Scholar |
Tylenda, R., Hajduk, M., Kaminski, T., Udalski, A., Soszynski, I., Szymanski, M. K., Kubiak, M., Pietrzynski, G., Poleski, R., Wyrzykowski, L. and Ulaczyk, K., 2011, A&A, 528, 114
| Crossref | GoogleScholarGoogle Scholar |
Uchida, Y. and Sakurai, T., 1985, IAUS, 107, 281
Van Hamme, W., 1993, AJ, 106, 2096
| Crossref | GoogleScholarGoogle Scholar |
Van Hamme, W. & Wilson, R. E., 2003, ASP Conf. Ser. 298, GAIA
Wesselink, A. J., 1969, MNRAS, 144, 297
Wilson, R. E., Pettera, L. E. and Van Hamme, W., 1985, APJ, 289, 748
Wilson, R. E. and Caldwell, C. N., 1978, ApJ, 221, 917
| Crossref | GoogleScholarGoogle Scholar |
Wilson, R. E. and Devinny, E. J., 1971, ApJ, 166, 605
| Crossref | GoogleScholarGoogle Scholar |
Wilson, R. E. and Twigg, L. W., 1980, IAUS, 88, 263
Wilson, R. E., Van Hamme, W. and Pettera, L. A., 1985, APJ, 289, 748
| Crossref | GoogleScholarGoogle Scholar |