Journal of Astronomy and Space Sciences

The Korean Space Science Society (한국우주과학회)
권호 표지
DOI QR코드

DOI QR Code

SW Lyncis-Advances and Questions

  • Kim, Chun-Hwey (Department of Astronomy and Space Science, and Chungbuk National University Observatory, Chungbuk National University) ;
  • Kim, Ho-Il (Korea Astronomy and Space Science Institute) ;
  • Yoon, Tae-Seog (Department of Astronomy and Atmospheric Sciences, Kyungpook National University) ;
  • Han, Won-Yong (Korea Astronomy and Space Science Institute) ;
  • Lee, Jae-Woo (Korea Astronomy and Space Science Institute) ;
  • Lee, Chung-Uk (Korea Astronomy and Space Science Institute) ;
  • Kim, Jin-Hyung (Department of Astronomy and Atmospheric Sciences, Kyungpook National University) ;
  • Koch, Robert H. (Department of Physics and Astronomy, University of Pennsylvania)
  • Received : 2010.11.08
  • Accepted : 2010.11.22
  • Published : 2010.12.15
Download PDF
⟨ Previous Next ⟩

Abstract

Many filtered CCD measures form the basis of six new light curves of the eclipsing system SW Lyn. From these measures and additional observations for eclipse timing, 47 new times of minimum light over the time-interval of about 13 years have been calculated. The complex period variability can be sorted into a linear period improvement with 5.8-year and 33.9-year periodic terms. The shorter cyclic term of these is ascribed to a cool companion of the eclipsing pair but the longer one has no testable interpretation at present. The new light curves are synthesized by the 2003 version of the Wilson-Devinney differential corrections computer code. The results incorporate a source of "third light" which comes from the cool companion star that had been identified by the cycling of the period of the eclipsing pair and also had previously been identified spectroscopically. There is a measure of satisfaction with current understanding of the SW Lyn eclipsing system because of consistent syntheses of all historical light curves. This agreeable convergence, however, comes partly at the expense of an unanticipated temperature of the hot star and of a photospheric spot that has no obvious basis in the detached character modeled for the binary. We offer predictions of changes in the stellar parameters if the modeled detached-configuration should be wrong. The SW Lyn stellar system is still difficult to understand.

Keywords

References

  1. Agerer, F., Dahm, M., & Hubscher, J. 2001, IBVS, 5017, 1
  2. Agerer, F. & Hubscher, J. 1999, IBVS, 4711, 1
  3. Agerer, F. & Hubscher, J. 2002, IBVS, 5296, 1
  4. Agerer, F. & Hubscher, J. 2003, IBVS, 5484, 1
  5. Applegate, J. H. 1992, ApJ, 385, 621, doi: 10.1086/170967
  6. Brat, L., Smelcer, L., Kucakova, H., Ehrenberger, R., Kocian, R., Lomoz, F., Urbancok, L., Svoboda, P., Trnka, J., Marek, P., Dreveny, R., Uhlar, R., Poddany, S., Zasche, P., & Skarka, M. 2008, Open Eur. J. Var. Stars, 94, 1
  7. Brat, L., Trnka, J., Lehky, M., Smelcer, L., Kucakova, H., Ehrenberger, R., Dreveny, R., Lomoz, F., Marek, P., Kocian, R., Svoboda, P., Pribik, V., Urbancok, L., Poddany, S., Dubovsky, P. A., Uhlar, R., Horalek, P., Hanzl, D., Broz, M., Kalisch, T., Macek, O., Exnerova, M., & Vítek, M. 2009, Open Eur. J. Var. Stars, 107, 1
  8. Brat, L., Zejda, M., & Svoboda, P. 2007, Open Eur. J. Var. Stars, 74, 1
  9. Diethelm, R. 1985, BBSAG Bull., 76
  10. Dvorak, S. W. 2010, IBVS, 5938, 1
  11. Eggleton, P. P. & Kiselev, L. G. 1995, ApJ, 455, 640, doi: 10.1086/176611
  12. European Space Agency (ESA) 1997, The Hipparcos and Tycho Catalogues (ESA SP-1200, Noordwijk: ESA)
  13. Gleim, J. K. 1967, AJ, 72, 493, doi: 10.1086/110256
  14. Harrington, R. S. 1977, RMxAA, 3, 139
  15. Hill, G., Hilditch, R. W., Younger, F., & Fisher, W. A. 1975, MmRAS, 79, 131
  16. Hoffmeister, C. 1949, AN, 247, 272
  17. Hubscher, J. 2005, IBVS, 5643, 1
  18. Hubscher, J. 2007, IBVS, 5802, 1
  19. Hubscher, J., Lichtenknecker, D., & Wunder, E. 1990, BAV Mitt., 56
  20. Hubscher, J., Steinbach, H. M., & Walter, F. 2009, IBVS, 5874, 1
  21. Huth, H. 1958, Mitt. Ver. Sterne, No. 351
  22. Johnson, D. R. H. & Soderblom, D. R. 1987, AJ, 93, 864, doi: 10.1086/114370
  23. Kaluzny, J. 1985, AcA, 35, 327
  24. Kim, C.-H. 1999, JASS, 16, 11
  25. Kim, C.-H. & Han, W.-Y. 1993, in New Frontiers in Binary Star Research, eds. K. C. Leung & I. S. Nha, ASP Conf. Ser., 38, 347
  26. Kim, C.-H., Jeong, J. H., Demircan, O., Muyesseroglu, Z., & Budding, E. 1997, AJ, 114, 2753, doi: 10.1086/118684
  27. Kim, C.-H., Kim, H.-I., Han, W., Yoon, T. S., & Kim, J.-H. 2002, in the Sixth Pacific Rim Conference on Stellar Astrophysics (Xian, China)
  28. Kim, C.-H., Lee, C.-U., Yoon, Y.-N., Park, S.-S., Kim, D.-H., Cha, S.-M., & Won, J.-H. 2006, IBVS, 5694, 1
  29. Kim, C.-H., Lee, J. W., Kim, S.-L., Han, W., & Koch, R. H. 2003, AJ, 125, 322, doi: 10.1086/344808
  30. Kim, H.-I., Han, W., Lee, W.-B., & Kim, C.-H. 1995, JASS, 12, 196
  31. Kim, H.-I., Lee, J. W., Kim, C.-H., Youn, J.-H., Kwon, S.-G., Lee, D.-J., & Koch, R. H. 2004, PASP, 116, 931, doi: 10.1086/425606
  32. Kim, J.-H. 2001, MS Thesis, Kyungpook Natioal University
  33. Krajci, T. 2007, IBVS, 5806, 1
  34. Kreiner, J. M., Kim, C.-H., & Nha, I.-S. 2001, An Atlas of (O-C) Diagrams of Eclipsing Binary Stars (Krakow: Wydawn. Nauk. Akad. Pedagogicznej)
  35. Kreiner, J. M., Rucinski, S. M., Zola, S., Niarchos, P., Ogloza, W., Stachowski, G., Baran, A., Gazeas, K., Drozdz, M., Zakrzewski, B., Pokrzywka, B., Kjurkchieva, D., & Marchev, D. 2003, A&A, 412, 465, doi: 10.1051/0004-6361:20031456
  36. Kreiner, J. M., Tremko, J., & Zola, S. 1997, in the Third Pacific Rim Conference on Recent Development of Binary Star Research, ed. K. C. Leung, ASP Conf. Ser., 130, 273
  37. Kurucz, R. L. 1993, in Light Curve Modeling of Eclipsing Binary Stars, ed. E. F. Milone (New York, Springer), p.93
  38. Kwee, K. K. & van Woerden, H. 1956, BAN, 12, 327
  39. Landolt, A. U. 1973, PASP, 85, 742, doi: 10.1086/129539
  40. Lanza, A. F., Rodonó, M., & Rosner, R. 1998, MNRAS, 296, 893, doi: 10.1046/j.1365-8711.1998.01446.x
  41. Lee, J. W., Kim, C.-H., Han, W., Kim, H.-I., & Koch, R. H. 2004, MNRAS, 352, 1041, doi: 10.1111/j.1365-2966.2004.07996.x
  42. Lee, J. W., Youn, J.-H., Lee, C.-U., Kim, S.-L., & Koch, R. H. 2009, AJ, 138, 478, doi: 10.1088/0004-6256/138/2/478
  43. Li, Y. & Qian, S. B. 2005, in the Light-Time Effect in Astrophysics, ed. C. Sterken, ASP Conf. Ser., 335, 245
  44. Liu, Q., Yang, Y., Zhang, Y., & Wang, B. 1991, IAPPP Comm., 45, 57
  45. Lu, W., Rucinski, S. M., & Ogloza, W. 2001, AJ, 122, 402, doi: 10.1086/321131
  46. Maciejewski, G. & Karska, A. 2004, IBVS, 5494, 1
  47. Nagai, K. 2004, Var. Star Bull. Japan, 42, 1
  48. Nelson, R. H. 2003, IBVS, 5371, 1
  49. Nelson, R. H. 2004, IBVS, 5493, 1
  50. Nelson, R. H. 2006, IBVS, 5672, 1
  51. Nelson, R. H. 2007, IBVS, 5760, 1
  52. Nelson, R. H. 2008, IBVS, 5820, 1
  53. Ogloza, W., Drozdz, M., & Zola, S. 2000, IBVS, 4877, 1
  54. Ogloza, W., Zola, S., Tremko, J., & Kreiner, J. M. 1998, A&A, 340, 81
  55. Park, N. K. 1993, Pub. Korean Astron. Soc., 8, 185
  56. Patkos, L. 1975, IBVS, 1065, 1
  57. Patkos, L. 1976, IBVS, 1200, 1
  58. Patkos, L. 1980, IBVS, 1751, 1
  59. Predolin, F., Giuricin, G., & Mardirosian, F. 1980, IBVS, 1801, 1
  60. Press, W., Flannery, B. P., Teukolsky, S. A., & Vetterling, W. T. 1992, Numerical Recipes (Cambridge, Cambridge University Press), chap.14
  61. Scargle, J. D. 1982, ApJ, 263, 835, doi: 10.1086/160554
  62. Senavci, H. V., Tanriverdi, T., Torun, E., Elmasli, A., Kilicoglu, T., Cinar, D., Sipahioglu, S., Alan, N., Colak, T., Yilmaz, M., Ulus, N. D., Basturk, O., Caliskan, S., Aydin, G., Ekmekci, F., Albayrak, B., & Selam, S. O. 2007, IBVS, 5754, 1
  63. Shaw, J. S. 1990, Active Close Binaries, ed. C. Ibanoglu (The Netherlands: Kluwer Academic Publishers), p.241
  64. Shaw, J. S. 1994, MmSAI, 65, 95
  65. Shaw, J. S., Caillault, J. P., & Schmitt, J. H. M. M. 1996, ApJ, 461, 951, doi: 10.1086/177116
  66. Tokovinin, A. 2004, RMxAA, 21, 7
  67. van Hamme, W. 1993, AJ, 106, 2096, doi: 10.1086/116788
  68. Vetesnik, M. 1968, BAICz, 19, 110
  69. Vetesnik, M. 1977, BAICz, 28, 120
  70. Wilson, R. E. 1979, ApJ, 234, 1054, doi: 10.1086/157588
  71. Wilson, R. E. 1993, Documentation of Eclipsing Binary Computer Model (Gainesville: Department of Astronomy, University of Florida)
  72. Wilson, R. E. & Biermann, P. 1976, A&A, 48, 349
  73. Wilson, R. E. & Devinney, E. J. 1971, ApJ, 166, 605, doi: 10.1086/150986
  74. Zejda, M. 2004, IBVS, 5583, 1

Cited by

  1. The First Comprehensive Photometric Study of the Neglected Binary System V345 Cassiopeiae vol.30, pp.4, 2013, https://doi.org/10.5140/JASS.2013.30.4.213
  2. Phenomenological Modeling of Newly Discovered Eclipsing Binary 2MASS J18024395 + 4003309 = VSX J180243.9+400331 vol.32, pp.2, 2015, https://doi.org/10.5140/JASS.2015.32.2.127
  3. An Orbital Stability Study of the Proposed Companions of SW Lyncis vol.31, pp.3, 2014, https://doi.org/10.5140/JASS.2014.31.3.187