Evolution of Low Mass Contact Binaries

• Autorzy: Stępień K. , Gazeas K.
• Języki publikacji: EN

Abstrakty

EN

We present a study on low-mass contact binaries (LMCB) with orbital periods shorter than 0.3 days and total mass lower than about 1.4 M_Sun. We show that such systems have a long pre-contact phase, which lasts for 8-9 Gyrs, while the contact phase takes only about 0.8 Gyr, which is rather a short fraction of the total life. With low mass transfer rate during contact, moderate mass ratios prevail in LMCBs since they do not have enough time to reach extreme mass ratios often observed in higher mass binaries. During the whole evolution both components of LMCBs remain within the MS band. The evolution of cool contact binaries toward merging is controlled by the interplay between the evolutionary expansion of the less massive component resulting in the mass transfer to the more massive component and the angular momentum loss from the system by the magnetized wind. In LMCB the angular momentum loss prevails. As a result, the orbital period systematically decreases until the binary overflows the outer critical Roche surface and the components merge into a single fast rotating star of a solar type surrounded by a remnant disk carrying excess angular momentum. The disk can be a place of planet formation with the age substantially lower than the age of a host star. The calculated theoretical tracks show good agreement with the physical properties of LMCB from the available observations. Estimates of the frequency of occurrence of LMCB and the merger formation rate indicate that about 40 LMCBs and about 100 low mass merger products is expected to exist within 100 pc from the Sun.

Słowa kluczowe

EN

planets: formation; satellites: formation; binaries: eclipsing; binaries: close; stars: evolution; stars: low-mass

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2012
• Tom: Vol. 62, No. 2
• Strony: 153--177
• Opis fizyczny: Bibliogr. 80 poz., tab., wykr.

Twórcy

autor

Stępień K.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland

autor

Gazeas K.

• Department of Astrophysics, Astronomy and Mechanics, University of Athens, GR-157 84, Zografos, Athens, Greece
• European Space Agency, ESTEC, Mechatronics and Optics Division, Keplerlaan1, 2200AG, Noordwijk, The Netherlands

Bibliografia

• Bilir, S., Karata¸s, Y., Demircan, O., and Eker, Z. 2005, MNRAS, 357, 497.
• Binnendijk, L. 1966, Publications of DAO, 13, 27.
• Binnendijk, L. 1970, Vistas Astron., 12, 217.
• Bradstreet, D.H. 1985, ApJS, 58, 413.
• Christopoulou, P.-E., Papageorgiou, A., and Chrysopoulos, I. 2011, AJ, 142, 99.
• Djurašević, G., Yilmaz, M., Baştürk, Ö., Kiliçoğlu, T., Latković, O., and Çalişkan, ¸S. 2011, A&A, 525, 66.
• Eaton, J., Wu, C.C., and Rucinski, S.M. 1980, ApJ, 239, 919.
• Eggleton, P.P. 1983, ApJ, 268, 368.
• Eggleton, P.P., and Kiseleva-Eggleton, L. 2002, ApJ, 575, 461.
• Flannery, B.P. 1976, ApJ, 205, 217.
• Gazeas, K.D., and Niarchos, P.G. 2006, MNRAS, 370, L29.
• Gazeas, K.D., Niarchos, P.G., and Gradoula, G.-P. 2006, Astrophys. and Space Sci., 304, 125.
• Gazeas, K., and St˛epie´n, K. 2008, MNRAS, 390, 1577.
• Girardi, L., Bressan, A., Bertelli, G., and Chiosi, C. 2000, A&AS, 141, 371.
• Gray, J.D., Woissol, S., and Samec, R.G. 1996, IBVS, 4359.
• Hendry, P.D., Mochnacki, S.W., and Collier Cameron, A. 1992, ApJ, 399, 246.
• Hrivnak, B.J., Guinan, E.F., and Lu, W. 1995, AJ, 455, 300.
• Kaluzny, J., and Rucinski, S. 1986, AJ, 92, 666.
• Khajavi, M., Edalati, M.T., and Jassur, D.M.Z. 2002, Astrophys. Space Sci., 282, 645.
• Kippenhahn, R., and Weigert, A. 1967, Zs. f. Ap., 65, 251.
• Kubiak, M., Udalski, A., and Szymański, M. 2006, Acta Astron., 56, 253.
• Lapasset, E., Gomez, M., and Farinas, R. 1996, PASP, 108, 332.
• Lee, J.W., Kim, S.-L., Lee, C.-U., and Youn, J.-H. 2009, PASP, 121, 1366.
• Lucy, L.B. 1976, ApJ, 205, 208.
• Maceroni, C., Milano, L., Russo, G., and Sollazzo, C. 1981, Astrophys. Space Sci., 45, 187.
• Maceroni, C., Milano, L., and Russo, G. 1984, A&AS, 58, 405.
• Maceroni, C., and van’t Veer, F. 1996, A&A, 311, 523.
• Marino, B.F., Walker, W.S.G., Bembrick, C., and Budding, E. 2007, Publ. of the Astron. Soc. Of Australia, 24, 199.
• Martin, E.L., Spruit, H.C., and Tata, R. 2011, A&A, 535, A50.
• Melis, C., Gielen, C., Chen, C.H., Rhee, J.H., Song, I., and Zuckerman, B. 2010, ApJ, 724, 470.
• Messina, S., Pizzolato, N., Guinan, E.F., and Rodono, M. 2003, A&A, 410, 671.
• Mochnacki, S.W. 1981, ApJ, 245, 650.
• Niarchos, P.G., Hoffmann, M., and Duerbeck, H.W. 1997, A&AS, 124, 291.
• Pilecki, B. 2009, PhD Thesis, Warsaw University.
• Pilecki, B., and Stępień, K. 2012, IBVS, 6012.
• Pojmański, G. 2002, Acta Astron., 52, 397.
• Pribulla, T., and Rucinski, S.M. 2006, AJ, 131, 2986.
• Qian, S.-B., Yuan, J.-Z., Soonthornthum, B., Zhu, L.-Y., He, J.-J., and Yang, Y.-G. 2007, AJ, 671, 811.
• Rahunen, T. 1981, A&A, 102, 81.
• Rahunen, T. 1982, A&A, 109, 66.
• Rahunen, T. 1983, A&A, 117, 235.
• Randich, S., Schmitt, J.H.M.M., Prosser, C.F., and Stauffer, J.R. 1996, A&A, 305, 785.
• Robb, R.M. 1992, IBVS, 3798.
• Robb, R. M., Greimel, R., and Oullette, J. 1997, IBVS, 4504.
• Rucinski, S.M. 2000, AJ, 120, 319.
• Rucinski, S.M. 2006, MNRAS, 368, 1319.
• Rucinski, S.M. 2007, MNRAS, 382, 393.
• Rucinski, S.M. 2010, in “International Conference on Binaries”, Eds. V. Kalogera and M. van der Sluys, AIP Conf. Proc., 1314, p. 29.
• Rucinski, S.M., and Paczynski, B. 2002, IBVS, 5321.
• Rucinski, S.M., and Pribulla T. 2008, MNRAS, 388, 1831.
• Samec, R.G., Su, W., and Dewitt, J.R. 1993, PASP, 105, 1441.
• Samec, R.G., Carrigan, B., and Padgen, E.E. 1995, IBVS, 4167.
• Samec, R.G., and Terrell, D. 1995, PASP, 107, 427.
• Samec, R.G., Gray, J.D., and Carrigan, B.J. 1995, PASP, 107, 136.
• Samec, R.G., Carrigan, B. J., and Wei Looi, M. 1998, AJ, 115, 1160.
• Samec, R.G., and Corbin, S.F. 2001, IBVS, 5145.
• Samec, R., and Loflin, T. 2004, Observatory, 124, 284.
• Samec, R.G., Martin, M., and Faulkner, D.R. 2004, 5527.
• Spruit, H.C., and Weiss, A. 1986, A&A, 166, 167.
• Stępień, K. 1980, Acta Astron., 30, 315.
• Stępień, K. 1995, MNRAS, 274, 1019.
• Stępień, K. 2004, in “Stars as Suns: Activity, Evolution and Planets”, IAU Symp., 219, Eds. A.K. Dupree and A.O. Benz, Astr. Soc. of Pacific, p. 967.
• Stępień, K. 2006, Acta Astron., 56, 199.
• Stępień, K. 2009, MNRAS, 397, 857.
• Stępień, K. 2011, Acta Astron., 61, 139.
• Stępień, K., Schmitt, J.H.M.M., and Voges, W. 2001, A&A, 370, 157.
• Szymański, M., Kubiak, M., and Udalski, A. 2001, Acta Astron., 51, 259.
• Tassoul, J.-L. 1992, ApJ, 389, 375.
• Torres, G., Andersen, J., and Giménez, A. 2010, A&ARev., 18, 67.
• Tylenda, R., Hajduk, M., Kamiński, T., Udalski, A., Soszyński I., Szymański, M.K., Kubiak, M., Pietrzynski, G., Poleski, R., Wyrzykowski, Ł., and Ulaczyk, K. 2011, A&A, 528, 114.
• Vilhu, O. 1981, Astrophys. Space Sci., 78, 401.
• Vilhu, O. 1982, A&A, 109, 17.
• Webbink, R.F. 1977, ApJ, 211, 881.
• Webbink, R.F. 2003, in „Stellar Evolution”, Eds. S. Turcotte et al. ASP Conf. Ser., 293, p. 76.
• Yakut, K., and Eggleton, P.P. 2005, ApJ, 629, 1055.
• Yang, Y.-G., Wei, J.-Y, and Li, H.-L. 2010, New Astronomy, 15, 155.
• Zhu, L., Qian, S.-B., Mikulášek, Z., Zejda, M., Zvĕřina, and Diethelm, R. 2010, AJ, 140, 215.
• Zola, S., et al. 2005, Acta Astron., 55, 389.
• Zola, S., Gazeas, K., Kreiner, J.M., Ogloza, W., Siwak, M., Koziel-Wierzbowska, D., and Winiarski, M. 2010, MNRAS, 408, 464.
• Zuckerman, B., et al. 2008, ApJ, 683, 1085.