PHOTOMETRIC OBSERVATIONS of FOUR W UMA BINARIES

Abstract

In this work, the light curves of NSVS2175434, V783 And, ASAS J020753+2034.1 and NR CAM W Uma type eclipsing binary star systems were obtained by using 0.5 meter ATA50 telescope in Atatürk University Astrophysics Research and Application Center (ATASAM). The orbital period variations of the systems were analyzed using the "timing" method. Only the O-C diagram of NR Cam was performed because the eclipse times of the other systems in the literature are not sufficient. When the O-C diagram of the NR Cam system is examined, no clear change has been observed for the time being. However, more observational data are needed to understand whether changes will occur in the future.

Keywords

• Binaries
• W Uma
• Eclipsing Stars

DÖRT W UMA ÇİFT YILDIZ SİSTEMİNİN FOTOMETRİK GÖZLEMLERİ

Öz

Bu çalışmada NSVS2175434, V783 And, ASAS J020753+2034.1 ve NR CAM W Uma tipi örten çift yıldız sistemlerinin Atatürk Üniversitesi Astrofizik Araştırma ve Uygulama Merkezi (ATASAM) bünyesindeki 0.5 metrelik ATA50 teleskobu ile elde edilen örtülme ışık eğrileri sunuldu. Sistemlerin yörünge dönem değişimleri “zamanlama” yöntemi kullanılarak incelendi. NR Cam dışındaki sistemlerin literatürdeki minimum zamanları yeterli olmadığı için sadece NR Cam’ın O-C diyagramı oluşturuldu. NR Cam sistemine ait O-C diyagramı incelendiğinde net bir değişime şu an için rastlanılmadı. Ancak ilerleyen zamanlarda değişimin olup olmayacağını daha net görebilmek için daha fazla gözlemsel veriye ihtiyaç vardır.

Anahtar Kelimeler

• çift yıldızlar
• W Uma
• Örtülme

Kaynakça

1. [1] Binnendijk, L., 1970. The orbital elements of W Ursae Majoris systems. Vistas in Astronomy, 12(1) 217−256
2. [2] Karttunen, H., Kröger, P., Oja, H., Poutanen, M., Donner, K. J., 2007. Fundamental Astronomy. Springer, 510s, New York
3. [3] Percy, J. R., 2007. Understanding Variable Stars. Cambridge University Press, 350s, Kanada
4. [4] Binnendijk, L., 1977. Synthetic light curves for contact binaries. Vistas in Astronomy, 21(4), 359−391
5. [5] Lee, J. W., Kim, S. L., Kim, C. H., Koch, R. H., Lee, C. U., Kim, H. I., Park, J. H., 2009. The sdB+M Eclipsing System HW Virginis and its Circumbinary Planets. The Astronomical Journal, 137(2), 3181−3190
6. [6] Gozdziewski, K., Nasiroglu, I., Slowikowska, A., Beuermann, K. et al., 2012. On the HU Aquarii planetary system hypothesis. Monthly Notices of the Royal Astronomical Society, 425(2), 2, 930−949.
7. [7] Gozdziewski, K., Slowikowska, A., Dimitrov, D., Krzeszowski, K. et al. 2015. The HU Aqr planetary system hypothesis revisited. Monthly Notices of the Royal Astronomical Society, Volume 448(2), 1118−1136
8. [8] Marsh, T.R., Parsons, S.G., Bours, M.C.P., Littlefair, S.P. et al., 2014. The planets around NN Serpentis: still there. Monthly Notices of the Royal Astronomical Society, 437(1), 475−488

9. [9] Nasiroglu, I., Gozdziewski, K., Slowikowska, A., Krzeszowski, K., Zejmo, M., Zola, S., Er, H. et al., 2017. Is There a Circumbinary Planet around NSVS 14256825?. The Astronomical Journal, 153(3), 11
10. [10] Er, H., Özdönmez, A. and Nasiroglu, I, 2021. New observations of the eclipsing binary system NY Vir and its candidate circumbinary planets. Monthly Notices of the Royal Astronomical Society, 507, 809-817
11. [11] Beuermann, K., Breitenstein, P., Debski, B., Diese, J. et al. 2012a. The quest for companions to post-common envelope binaries. II. NSVS 14256825 and HS0705+6700.Astronomy & Astrophysics, 540(A8), 5
12. [12] http://simbad.u-strasbg.fr/simbad/sim-fbasic
13. [13] Eastman, J., Siverd, R., Gaudi, B. S., 2010. Achieving Better Than 1 Minute Accuracy in the Heliocentric and Barycentric Julian Dates. Publications of the Astronomical Society of the Pacific, 122(894), 935
14. [14] Tavakkoli, F., Hasanzadeh, A., and Poro, A., 2015. The first light curve analysis of eclipsing binary NR Cam. New Astronomy, 37, 64-69
15. [15] Hilditch, R.W., 2001. An Introduction to Close Binary Stars. Cambridge University Press, 381s, ABD
16. [16] Kjurkchieva, D., P., et al., 2018. Observations and light curve solutions of three ultrashort-period W Uma binaries. New Astronomy, 62, 41-45
17. [17]https://www.aavso.org/vsx/index.php?view=detail.top&oid=286477
18. [18] Pojmanski, G., Pilecki, B., and Szczygiel, D., The All Sky Automated Survey. The Catalog of Variable Stars. V. Declinations 0 deg - 28 deg of the Northern Hemisphere. ArXiv, arXiv:astro-ph/0508017
19. [19] Strohmeier, W., 1958. kleineveröffentlichungen der Remeis-Sternwarte. Bamberg., No. 23.