Investigation of orbital period variations of two low mass ratio contact binary stars: V404 Peg and V619 Peg

Yıl 2020, Cilt: 22 Sayı: 1, 228 - 239, 10.01.2020

Burcu Özkardeş

https://doi.org/10.25092/baunfbed.680658

Öz

In this study the period variations of two over contact systems with low mass ratio are examined in detail for the first time. Period analyses of the systems are performed using the O-C method with their all minima times collected from the databases and published papers. The O-C diagram of V404 Peg shows a downward parablic trend, and it is found that its period has a secular decrease at a rate of 9.3(5) x10-2 s/yr. The O-C diagram of V619 Peg shows an upward parabolic+cyclical character which indicates a continuous increase at a rate of 6.3(1)x10-2 s/yr in the system’s orbital period. The cyclical period variation is discussed according to a possible third companion and Applegate mechanism.

Anahtar Kelimeler

Contact binary stars, period analysis, V404 Peg, V619 Peg

Düşük kütle oranlı iki değen çift yıldızın yörünge dönemi değişimlerinin incelenmesi: V404 Peg ve V619 Peg

Öz

Bu çalışmada düşük kütle oranına sahip iki aşırı değen çift yıldızın yörünge dönemi değişimleri, detaylı olarak ilk kez incelenmiştir. Hedef sistemlerin dönem analizleri, veri tabanlarından ve literatür yayınlarından alınan minimum ışık zamanları kullanılarak O-C yöntemine göre yapılmıştır. V404 Peg’in O-C diyagramının aşağı parabol şeklinde bir yapı gösterdiği ve döneminin 9.3(5)x10-2 s/yıl oranında azaldığı bulunmuştur. V619 Peg’in O-C diyagramının parabol+çevrimsel yapı gösterdiği ve döneminin 6.3(1)x10-2 s/yıl oranında arttığı bulunmuş; çevrimsel dönem değişimi, olası üçüncü cisme ve Applegate mekanizmasına göre tartışılmıştır.

Anahtar Kelimeler

Değen çift yıldızlar, dönem analizi, V404 Peg, V619 Peg

Teşekkür

Çalışmada, “NASA Astrophysics Data System Abstract Service” ve “SIMBAD at CDS, Starsbourg, France” olmak üzere iki veri kaynağından yararlanılmıştır. Düzenlenmiş yazılım kodunun kullanılmasındaki desteğinden dolayı Dr. P. Zasche’ye ve bu çalışmayı değerlendirerek önerilerde bulunan değerli hakemlere teşekkür ederim.

Kaynakça

• Bilir, S., Karataş, Y., Demircan, O. ve Eker, Z., Kinematics of W Ursae Majoris Type Binaries and Evidence of Two Types of Formation, Monthly Notices of the royal Astronomical Society, 357(2), 497–517, (2005).
• Qian, S., Yang, Y., Zhu, L., Liying, H. ve Jiajia, Y. J., Photometric studies of twelve deep, low-mass ratio overvontact binary systems, Astrophysics and Space Science, 304, 25–28, (2006).
• Maciejewski, G., Karska, A. ve Niedzielski, A., GSC 02757-00769 – A new EW binary system, Information Bulletin on Variable Stars, No. 5370, 1, (2003).
• Maciejewski, G. ve Niedzielski, A., A semi-automatic variability search, Baltic Astronomy, 13, 700–703, (2004).
• Maciejewski, G. ve Ligeza, P., Mass ratio determination of binary systems BD+14d 5016, GSC 2757-769 and GSC 3472-641, Information Bulletin on Variable Stars, No. 5504, 1, (2004).
• Kazarovets, E. V., Samus, N. N., Durlevich, O. V., Kireeva, N. N. ve Pastukhova, E. N., The 78th name-list of variable stars, Information Bulletin on Variable Stars, No. 5721, 1, (2006).
• Gürol, B., Terzioğlu, Z., Gürsoytrak, S. H., Gökay, G. ve Derman, E., Absolute and geometric parameters of the W UMa-type contact binary V404 Pegasi, Astronomische Nachricten, 332, 690–696, (2011).
• Yıldız, M. ve Doğan, T., On the origin of W UMa type contact binaries–a New method for computation of initial masses, Monthly Notices of the Royal Astronomical Society, 430, 2029–2038, (2013).
• Rucinski, S. M., Pribulla, T. ve Budaj, J., Spectroscopic metallicity determinations for W UMa type binary stars, The Astronomical Journal, 146,1–20, (2013).
• Avvakumova, E. A., Malkov, O. Y. ve Kniazev, A. Y., Eclipsing variables: catalogue and classification, Astronomische Nachricten, 334, 860–865, (2013).
• Huebscher, J. ve Monninger, G., BAV-results of observations–photoelectric minima of selected eclipsing binaries and maxima of pulsating stars, Information Bulletin on Variable Stars, No. 5959, 1, (2011).
• Huebscher, J., Lehmann, P. B. ve Walter, F., BAV-results of observations–photoelectric minima of selected eclipsing binaries and maxima of pulsating stars, Information Bulletin on Variable Stars, No. 6010, 1, (2012).
• Huebscher, J., BAV-results of observations–photoelectric minima of selected eclipsing binaries and maxima of pulsating stars, Information Bulletin on Variable Stars, No. 6152, 1, (2015).
• Huebscher, J., BAV-results of observations–photoelectric minima of selected eclipsing binaries, Information Bulletin on Variable Stars, No. 6157, 1, (2016).
• Nicholson, M., Sutherland, J. ve Sutherland, C., New variable stars found in the NSVS database, Open European Journal on Variable Stars, 12, 1–3, (2005).
• Gürol, B., Derman, E., Müyesseroğlu, Z., Gürdemir, L., Gökay, G., Özbek, N., Sağır, U., Kalcı, R., Salman, G., Çoker, G., Eminoğlu, B., Demircan, Y. ve Terzioğlu, Z., Minima times of some eclipsing binary stars, Information Bulletin on Variable Stars, No. 5791, 1, (2007).
• Hoffman, D. I., Harrison, T. E. ve McNamara, B. J., Automated variable stars classification using the Northern Sky Variability Survey, The Astronomical Journal, 138, 466–477, (2009).
• Gürol, B., Derman, E., Saguner, T., Gürsoytrak, S. H., Terzioğlu, Z., Gökay, G., Demircan, Y., Okan, A. ve Saral, G., Absolute and geometric parameters of W UMa type contact binary TYC 1174-344-1, New Astronomy, 16, 242–249, (2011).
• Yıldız, M., Origin of W UMa-type contact binaries-age and orbital evolution, Montly Notices of the Royal Astronomical Society, 437, 185–194, (2014).
• Gettel, S. J., Geske, M. T. ve McKay, T. A., A catalog of 1022 bright contact binary stars, The Astronomical Journal, 31, 621–632, (2006).
• SIMBAD Astronomical Database, http://simbad.u-strasbg.fr/simbad, (22.05.2019).
• Yakut, K., İbanoğlu, C., Kalemoni, B. ve Değirmenci, Ö. L., New light curve analysis and period changes of the overcontact binary XY Leonis, Astronomy&Astrophysics, 401, 1095–1100, (2003).
• Irwin, J. B., Standard light-time curves, The Astronomical Journal, 64, 149–155, (1959).
• Kreiner, J. M., Up-to-date linear elements of eclipsing binaries, Acta Astronomica, 54, 207–210, (2004).
• Zasche, P., Liakos, A., Niarchos, P., Wolf, M., Manimanis, V. ve Gazeas, K., Period changes in six contact binaries: WZ And, V803 Aql, DF Hya, PY Lyr, FZ Ori, and AH Tau, New Astronomy, 14, 121–128, (2009).
• Huang, S. S., A dynamical problem in binary systems and its bearing on stellar evolution, The Astronomical Journal, 61, 49–61, (1956).
• Kwee, K. K., Investigation of variations in the period of sixteen bright short-period eclipsing binary stars, Bulletin of the Astronomical Institutes of the Netherlands, 14, 131–151, (1958).
• Pribulla, T., Chochol, D., Rovithis-Livaniou, H. ve Rovithis, P., The contact binary AW Ursae Majoris as a member of a multiple system, Astronomy and Astrophysics, 345, 137–148, (1999).
• Kriwattanawong, W., Tasuya, O. ve Poojon, P., Period change investigation of the lowmass ratio binary BO Ari, New Astronomy, 44, 12–16, (2016).
• Applegate, J. H., A mechanism for orbital period modulation in close binaries, The Astrophysical Journal, 385, 621–629, (1992).