Journal of The Korean Astronomical Society (천문학회지)

The Korean Astronomical Society (한국천문학회)
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COLOR EXCESSES AND PERIOD-COLOR RELATION OF CLASSICAL CEPHEIDS

  • Kim, Chul-Hee (Division of Science Education, Institute of Fusion Science, Chonbuk National University) ;
  • Moon, B.K. (Division of Science Education, Institute of Fusion Science, Chonbuk National University) ;
  • Yushchenko, A.V. (Odessa Astronomical Observatory, Odessa National University)
  • Received : 2010.07.07
  • Accepted : 2010.09.03
  • Published : 2010.10.31
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Abstract

Color excesses of classical Cepheids in the uvby color system are estimated for the calibration stars with distances from the literature that are measured independently. Intrinsic photometric indices for these stars are calculated and a calibrated empirical relation between (b - y)$_0$, period, [$c_1$], and [$m_1$] is derived through a linear fit. This relation is used to determine color excesses E(b-y) for 59 Cepheids. We also examine the period-color [log P : (b - y)$_0$] relation, and find no signs of nonlinearity. We estimate the effective temperature and surface gravity of several Cepheids using both Kurucz and MARCS/SSG grids for [Fe=H]=0.0. We confirm that both temperature and surface gravity are higher, by about 150K and 0.4 respectively, when the MARCS/SSG atmospheric grids are used.

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References

  1. Arellano Ferro, A., & Mantegazza, L. 1996, A UVBY Photometric Calibration of Iron Abundances in Supergiant Stars, A&A, 315, 542
  2. Arellano Ferro, A., Rojo Arellano, E., Gonzalez-Bedolla, S., & Rosenzwerg, P. 1998, UVBY Beta Photometric Data and Fourier Coeffcients for Galactic Population I and Population II Cepheids, ApJS, 117, 167 (AF) https://doi.org/10.1086/313108
  3. Bell, R. A., & Parsons, S. B. 1974, Theoretical Colours for F and G Supergiants, MNRAS, 169, 71 https://doi.org/10.1093/mnras/169.1.71
  4. Bell, R. A., Paltoglou, G., & Tripicco, M. J. 1994, Properties of the Washington Photometric System Derived from Synthetic Spectra, MNRAS, 268, 771 https://doi.org/10.1093/mnras/268.3.771
  5. Berdnikov, L. N., Dambis, A. K., & Voziakova, O. V. 2000, A&AS, 143, 211 https://doi.org/10.1051/aas:2000177
  6. Clem, J. L., VandenBerg, D. A., Grundahl, F., & Bell, R. A. 2004, Empirically Constrained Color-Temperature Relations. II. UVBY, AJ, 127, 122
  7. Eggen, O. J. 1982, The F0 IA Stars in NGC 457 and IC 2581, PASP, 94, 952 https://doi.org/10.1086/131091
  8. Eggen, O. J. 1983, Intermediate Band and (R,I) Observations of Long-Period Cepheids, AJ, 88, 998 (EG) https://doi.org/10.1086/113385
  9. Eggen, O. J. 1985, Cepheids and Nonvariable Supergiants, AJ, 90, 1260 (EG) https://doi.org/10.1086/113834
  10. Feltz, K. A., Jr., & McNamara, D. H. 1976, PASP, 88, 699, Color Excesses of Classical Cepheids. I https://doi.org/10.1086/130013
  11. Feltz, K. A. & McNamara, D. H. 1980, Color Excess of Classical Cepheids. II, PASP, 92, 609 (FM) https://doi.org/10.1086/130721
  12. Fernie, J. D. 1994, Color Excesses for Classical Cepheids from BV Photometry, ApJ, 429, 844 https://doi.org/10.1086/174368
  13. Fernie, J. D., Beatti, B., Evans, N. R., & Seager, S. 1995, A Database of Galactic Classical Cepheids, IBVS, 4148
  14. Kim, C., & Yushchenko, A. V. 2005, Color Excesses of Classical Cepheids, ApSS, 298, 489 (KY)
  15. Kim, C., 2008, Color Excesses of Classical Cepheids in UVBY Photometry, ApJ, 674, 1062 (K08) https://doi.org/10.1086/525239
  16. Kiss, L. L., & Szatmary, K. 1998, A Photometric and Spectroscopic Study of the Brightest Northern Cepheids - II. Fundamental Physical Parameters, MNRAS, 300, 616 https://doi.org/10.1046/j.1365-8711.1998.01943.x
  17. Kraft, R. F. 1961, Color Excesses for Supergiants and Classical Cepheids. V. The Period-Color and Period-Luminosity Relations: a Revision, ApJ, 134, 616 https://doi.org/10.1086/147184
  18. Kron, G. E., & Svolopolus, S. 1959, An Image-Tube Experiment at the Lick Observatory, PASP, 71, 126 https://doi.org/10.1086/127348
  19. Lester, J. B., Gray, R. O., & Kurucz, R. L. 1986, Theoretical UVBY-Beta Indices, ApJS, 61, 509 https://doi.org/10.1086/191122
  20. Ngeow, C. C., & Kanbur, S. M. 2004, Period-luminosity Relations for Galactic Cepheid Variables with Independent Distance Measurements, MNRAS, 349, 1130 (NK) https://doi.org/10.1111/j.1365-2966.2004.07595.x
  21. Ngeow, C. C., & Kanbur, S. M. 2006, Nonlinear Period-Luminosity Relation for the Large Magellanic Cloud Cepheids: Myths and Truths, ApJ, 650, 188
  22. Tammann, G. A., Sandage, A., & Reindl, B. 2003, New Period-Luminosity and Period-Color relations of classical Cepheids: I. Cepheids in the Galaxy, A&A, 404, 423 (TSR) https://doi.org/10.1051/0004-6361:20030354

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