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Complex Period Variations of the Neglected W UMa-type Binary System NY Lyrae

Published online by Cambridge University Press:  05 March 2013

S.-B. Qian*
Affiliation:
National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, P.R. China United Laboratory of Optical Astronomy, Chinese Academy of Sciences, 100012 Beijing, P.R. China Graduate School of the CAS, Beijing, P.R. China
L. Liu
Affiliation:
National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, P.R. China United Laboratory of Optical Astronomy, Chinese Academy of Sciences, 100012 Beijing, P.R. China Graduate School of the CAS, Beijing, P.R. China
L.-Y. Zhu
Affiliation:
National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, P.R. China United Laboratory of Optical Astronomy, Chinese Academy of Sciences, 100012 Beijing, P.R. China Graduate School of the CAS, Beijing, P.R. China
*
DCorresponding author. Email: qsb@ynao.ac.cn
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Abstract

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Orbital-period variations of the neglected W UMa-type binary star, NY Lyr, were analyzed based on two newly determined eclipse times together with the others compiled from the literature. A cyclic oscillation with a period of 82.1 yr and an amplitude of 0.0247 d was discovered to be superimposed on a continuous period increase (dP/dt = +1.33 × 10−7 d yr−1). After the long-term period increase and the large-amplitude cyclic oscillation were removed from the O–C diagram, the residuals suggest that there is another small-amplitude period oscillation (A4 = 0.0053 d, P4 = 19.4 years) in the orbital period changes. As in the cases of AH Cnc and AD Cnc, both the continuous period increase and the two cyclic period oscillations make NY Lyr an interesting system to study in the future. In order to understand the evolutionary state of the binary system, new photometric and spectroscopic observations and a careful investigation on those data are needed.

Type
Research Article
Copyright
Copyright © Astronomical Society of Australia 2009

References

Agerer, F., Dahm, M. & Hubscher, J., 2001, IBVS, 5017 Google Scholar
Agerer, F. & Hübscher, J., 2002, IBVS, 5296 Google Scholar
Blättler, E., 1998, BBASG, 116 Google Scholar
Blättler, E., 2001, BBASG, 126 Google Scholar
Dietholm, R., 1977, BBASG, 34 Google Scholar
Dietholm, R., 1978, BBASG, 39 Google Scholar
Dietholm, R., 1980, BBASG, 49 Google Scholar
Fabrycky, D. & Tremaine, S., 2007, ApJ, 669, 1298 CrossRefGoogle Scholar
Hoffmann, M., 1983, IBVS, 2344 Google Scholar
Hübscher, J., 2005, IBVS, 5643 Google Scholar
Hübscher, J., Agerer, F., Frank, P. & Wunder, E., 1994, BAVSM, 68 Google Scholar
Hübscher, J., Paschke, A. & Walter, F., 2006, IBVS, 5731 Google Scholar
Kholopov, P. N., Samus, N. N., Frolov, M. S. et al., 1985, GCVS (4th edition; Moscow: Nauka)Google Scholar
Kozai, Y., 1962, AJ, 67, 591 Google Scholar
Krajci, T., 2005, IBVS, 5592 Google Scholar
Kreiner, M. J., Kim, C.-H. & Nha, I.-S., 2001, An Atlas of O–C Diagrams of Eclipsing Binaries (Cracow: WNAP), 1520 Google Scholar
Krobusek, B., 1997, BBASG, 115 Google Scholar
Makarenko, E. N., 1965, PZ, 15, 445 Google Scholar
Morgenroth, O., 1935, AN, 256, 281 Google Scholar
Qian, S.-B., 2001a, MNRAS, 328, 635 Google Scholar
Qian, S.-B., 2001b, MNRAS, 328, 914 Google Scholar
Qian, S.-B., 2003, MNRAS, 342, 1260 Google Scholar
Qian, S.-B. & Yang, Y.-G., 2005, MNRAS, 356, 765 Google Scholar
Qian, S.-B., Liu, L., Soonthornthum, B., Zhu, L.-Y. & He, J.-J., 2006a, AJ, 131, 3028 Google Scholar
Qian, S.-B., Yang, Y.-G., Zhu, L.-Y., He, J.-J. & Yuan, J.-Z., 2006b, Ap&SS, 304, 25 Google Scholar
Qian, S.-B., Yuan, J.-Z., Soonthornthum, B., Zhu, L.-Y., He, J.-J. & Yang, Y.-G., 2007, ApJ, 671, 811 Google Scholar
Tsesevitch, V. P. & Grigorevskij, B., 1961, PZ, 13, 290 Google Scholar
Yang, Y.-L. & Li, L.-F., 1999, Publication of Yunnan Observatory, 1, 32 Google Scholar