[논문]A PHOTOMETRIC STUDY OF THE CONTACT BINARY XZ LEONIS

Lee Jae-Woo; Lee Chung-Uk; Kim Chun-Hwey; Kang Young-Woon

doi:10.5303/jkas.2006.39.2.041

A PHOTOMETRIC STUDY OF THE CONTACT BINARY XZ LEONIS 원문보기

Journal of the Korean astronomical society = 천문학회지, v.39 no.2, 2006년, pp.41 - 50

Lee Jae-Woo (Astrophysical Research Center for the Structure and Evolution of the Cosmos, Sejong University) , Lee Chung-Uk (Korea Astronomy and Space Science Institute) , Kim Chun-Hwey (Department of Astronomy and Space Science, College of Natural Science and Institute for Basic Science Research, Chungbuk National University) , Kang Young-Woon (Astrophysical Research Center for the Structure and Evolution of the Cosmos, Sejong University)

Abstract ▼ AI-Helper

We present the results of new multi-color CCD photometry for the contact binary XZ Leo, together with reasonable explanations for the period and light variations. Six new times of minimum light have been determined. A period study with all available timings confirms Qian's (2001) finding that the O-C residuals have varied secularly according to $dP/dt\;=\;+8.20{\times}10^{-8}\;d\;yr^{-l}$. This trend could be interpreted as a conservative mass transfer from the less massive cool secondary to the more massive hot primary in the system with a mass flow rate of about $5.37{\times}10^{-8}\;M_{\odot}\;yr^{-l}$. By simultaneous analysis of our light curves and the previously published radial-velocity data, a consistent set of light and velocity parameters for XZ Leo is obtained. The small differences between the observed and theoretical light curves are modelled by a blue third light and by a hot spot near the neck of the primary component. Our period study does not support the tertiary light but the hot region which may be formed by gas streams from the cool secondary. The solution indicates that XZ Leo is a deep contact binary with the values of q=0.343, $i=78^{\circ}.8$, ${\Delta}(T_1-T_2)=126\;K$, and f=33.6 %, differing much from those of Niarchos et al. (1994). Absolute parameters of XZ Leo are determined as follows: $M_1=1.84\;M_{\odot},\;M_2=0.63\;M_{\odot},\;R_1=1.75\;R_{\odot},\;R_2=1.10\;R_{\odot},\;L_1=7.19\;L_{\odot},\;and\;L_2=2.66\;L_{\odot}$.

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제안 방법

, the large difference between the photometric and spectroscopic mass ratios). In this paper, we present new BVRI light curves for the system and carry out a period study as well as a simultaneous analysis of light and radial velocity curves. Finally, based on our solution, an unique set of absolute parameters for the system is presented.
In the process, the matter in transit through the neck of Roche lobes is accelerated and causes a shock wave, which heats the photosphere near the neck region of the accreting star and forms a hot spot on its surface (Lu 1991). On the other hand, we evaluated the spot behavior before searching for third light and found that, in result, the photometric parameters are in excellent agreement with Model 1 within their errors yielded by 난re WD code.

대상 데이터

Differential measurements with the check star indicated the constancy of the light of our comparison star throughout the observing runs, and the 1 <7-values of an individual such measure are 0^013, 0^011, (T012 and (T012 from blue through infrared bandpasses. A total of 1310 individual observations was obtained in the four bandpasses (330 in B) 325 in V, 328 in R)and 327 in. I; these designations do not denote BVRI standardizations) and are available upon request from the authors or through the Web page http://www.
light curves. The observations were carried out with a SITe 2K CCD camera and a standard Johnson BVRI filter set attached to the 61-cm reflector at Sobaeksan Optical Astronomy Observatory in Korea. The CCD chip has 2048x2048 pixels and a pixel size of 24em, so the field of view (FOV) of a CCD frame is about 20/.

이론/모형

eclipses. All minima are the weighted means for the timings derived by the method of Kwee & van Woerden (1956) from the observations in the separate bandpasses. These are listed in Table 1, together with all photoelectric and CCD times of minimum light.

참고문헌 (58)

Agerer, F. & Hubscher, J., 1996, Photoelectric Minima of Selected Eclipsing Binaries, Inf. Bull. Variable Stars, No. 4383
Agerer, F. & Hubscher, J., 1997, Photoelectric Minima of Selected Eclipsing Binaries and Maxima of Pulsating Stars, Inf. Bull. Variable Stars, No. 4472
Agerer, F. & Hubscher, J., 1999, Photoelectric Minima of Selected Eclipsing Binaries, Inf. Bull. Variable Stars, No. 4711
Agerer, F. & Hubscher, J., 2000, Photoelectric Minima of Selected Eclipsing Binaries and Maxima of Pulsating Stars, Inf. Bull. Variable Stars, No. 4912
Agerer, F. & Hubscher, J., 2003, Photoelectric Minima of Selected Eclipsing Binaries, Inf. Bull. Variable Stars, No. 5484
Albayrak, B., et al., 2005, Photoelectric Minima of Some Eclipsing Binary Stars, Inf. Bull. Variable Stars, No. 5649
Ashbrook, J., 1952, Observed Times of Minimum of Eclipsing Variables, AJ, 57, 63
Bilir, S., Karatas, Y., Demircan, O., & Eker, Z., 2005, Kinematics of W Ursae Majoris Type Binaries and Evidence of the Two Types of Formation, MNRAS, 357, 497

상세보기
Binnendijk, L., 1970, The Orbital Elements of W Ursae Majoris Systems, Vistas in Astronomy, 12, 217

상세보기
Braune, W. & Mundry, E., 1982, Beobachtungsergebnisse der BAV (15th Compilation with Observations 1981-1982), BAV Mitt., No. 34
Burstein, D. & Heiles, C., 1982, Reddenings Derived from H I and Galaxy Counts: Accuracy and Maps, AJ, 87, 1165
Cox, A. N., 2000, Allen's Astrophysical Quantities (New York: Springer-Verlag)
Csizmadia, S., Zhou, A. Y, Konyves, V., Varga, Z., & Sandor, Z., 2002, Times of Minima of Eclipsing Binaries, Inf. Bull. Variable Stars, No. 5230
Diethelm, R., 1992, 133. List of Minima of Eclipsing Binaries, BBSAG Bull., No. 100
Diethelm, R., 1995, 141. List of Minima of Eclipsing Binaries, BBSAG Bull., No. 108
ESA. 1997, The Hipparcos and Tycho Catalogues (ESA SP-1200; Noordwijk: ESA)
Gotz, W. & Wenzel, W., 1961, Mitt. verand, Sterne Sonneberg, No. 530
Faulkner, D. R., 1986, Epochs of Minimum Light for 27 Eclipsing Binaries, PASP, 98, 690

상세보기
Flower, P. J., 1996, Transformations from Theoretical Hertzsprung-Russell Diagrams to Color-Magnitude Diagrams: Effective Temperatures, B- V Colors, and Bolometric Corrections, ApJ, 469, 355

상세보기
Harmanec, P., 1988, Stellar Masses and Radii Based on Modern Binary Data, Bull. Astron. Inst. Czech., 39, 329
Hilditch, R. W., King, D. J., & McFarlane, T. M., 1988, The Evolutionary State of Contact and Near-Contact Binary Stars, MNRAS, 231, 341
Hill, S. J. & Schilt, J., 1952, Photographic Magnitudes of 55700 Stars in the Zones 10 deg to 20 deg and 30 deg to 50 deg, Contr. Rutherfurd Obs. Columbia Univ., No. 32
Hoffmann, M., 1983, Minima of W UMa Stars, Inf. Bull. Variable Stars, No. 2344
Hoffmann, M. 1984, Photoelectric Observations of Contact Binary Stars, Veroff. Astr. Instr. Bonn, 96
Hoffmeister, C., 1934, 132 neue Veraderliche, Astron. Nachr. 253, 195

상세보기
Hubscher, J., 2005, Photoelectric Minima of Selected Eclipsing Binaries and Maxima of Pulsating Stars, Inf. Bull. Variable Stars, No. 5643
Hubscher, J., Agerer, F., & Wunder, E., 1992, Beobach-tungsergebnisse der BAV (25th Compilation with Observations 1991-1992), BAV Mitt., No. 60
Hubscher, J., Agerer, F., & Wunder, E., 1993, Beobach-tungsergebnisse der BAV (26th Compilation with Observations 1992-1993), BAV Mitt., No. 62
Hubscher, J., Agerer, F., & Wunder, E., 1994, Beobach-tungsergebnisse der BAV (27th Compilation with Observations 1993-1994), BAV Mitt., No. 68
Hubscher, J., Lichtenknecker, D., & Munder, E., 1985, Beobachtungsergebnisse der BAV (18th Compilation with Observations 1984-1985), BAV Mitt., No. 39
Hubscher , J., Lichtenknecker, D., & Wunder, E., 1989, Beobachtungsergebnisse der BAV (22th Compilation with Observations 1988-198992), BAV Mitt., No. 52
Hubscher, J. & Mundry, E., 1984, Beobachtungsergebnisse der BAV (17th Compilation with Observations 1983-1984), BAV Mitt., No. 38
Hubscher, J., Paschke, A., & Walter, F., 2005, Photoelectric Minima of Selected Eclipsing Binaries and Maxima of Pulsating Stars, Inf. Bull. Variable Stars, No. 5657
Kalimeris, A., Rovithis-Livaniou, H., & Rovithis, P., 2002, Starspots and Photometric Noise on Observed Minus Calculated (O-C) Diagrams, A&A, 387, 969

상세보기
Keskin, V. & Pohl.E., 1989, Photoelectric Minima of Eclipsing Binaries, Inf. Bull. Variable Stars, No. 3355
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)
Kwee, K. K., & van Woerden, H. 1956, A Method for Computing Accurately the Epoch of Minimum of an Eclipsing Variable, Bull. Astron. Inst. Netherlands, 12, 327
Lee, J. W., Kim, C.-H., Han, W., Kim, H.-I., & Koch, R. H. 2004, Period and Light Variations for the Cool, Overcontact Binary BX Pegasi, MNRAS, 352, 1041

상세보기
Lomb, N. R., 1976, Least-Squares Frequency Analysis of Unequally Spaced Data, Ap&SS, 39, 447

상세보기
Lu, W., 1991, Radial-Velocity Observations and Absolute Dimensions of Eclipsing Binaries - SS Ari, AJ, 102, 262
Lucy, L. B., 1976, W UMa Systems with Marginal Contact, ApJ, 205, 208

상세보기
Lucy, L. B., & Wilson, R. E., 1979, Observational Tests of Theories of Contact Binaries, ApJ, 231, 502

상세보기
Maceroni, C. & van't Veer, F., 1993, The Uniqueness of Photometric Solutions for Spotted W Ursae Majoris Binaries, A&A, 277, 515
Maceroni, C. & van't Veer, F., 1994, Period Variations of the Late Type Contact Binaries YY Eri and AE Phe: How to Use Light Curves Outside Minimum, A&A, 289, 871
Mochnacki, S. W., 1984, Accurate Integrations of the Roche Model, ApJS, 55, 551

상세보기
Nelson, R. H., 2001, CCD Minima of Selected Eclipsing Binaries in 2000, Inf. Bull. Variable Stars, No. 5040
Niarchos, P. G., Hoffmann, M., & Duerbeck, H. W., 1994, The Hot Contact Binary XZ Leonis, A&A, 292, 494
Press, W., Flannery, B. P., Teukolsky, S. A., & Verrerling, W. T., 1992, Numerical Recipes (Cambridge: Cambridge Univ. Press), chap. 13
Pribulla, T., Kreiner, J. M., & Tremko, J., 2003, Catalogue of the Field Contact Binary Stars, Contrib. Astron. Obs. Sk. Pleso, 33, 38
Prichodko, A., 1947, Variable Stars, 6, 135
Qian, S., 2001, Orbital Period Changes of Contact Binary Systems: Direct Evidence for Thermal Relaxation Oscillation Theory, MNRAS, 328, 914

상세보기
Rucinski, S. M. & Lu, W., 1999, Radial Velocity Studies of Close Binary Stars. II, AJ, 118, 2451

상세보기
Scargle, J. D., 1982, Studies in Astronomical Time Series Analysis. II - Statistical Aspects of Spectral Analysis of Unevenly Spaced Data, ApJ, 263, 835

상세보기
Van Hamme, W., 1993, New Limb-Darkening Coefficients for Modeling Binary Star Light Curves, AJ, 106, 209
Van't Veer, F., 1973, The Eclipsing Contact Binary VW Cep, A&A, 26, 357
Wilson, R. E. & Biermann, P., 1976, TX Cancri - Which Component is Hotter, A&A, 48, 349
Wilson, R. E. & Devinney, E. J., 1971, Realization of Accurate Close-Binary Light Curves: Application to MR Cygni, ApJ, 166, 605

상세보기
Wunder, E., Wieck, M., Kilinc, B., Gulmen, O., Tunca, Z., & Evren, S., 1992, New Photoelectric Minima of Some Eclipsing Binaries, Inf. Bull. Variable Stars, No. 3760

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