Reed, M. D. and Riddle, R. (2011) Whole Earth Telescope observations of the subdwarf B star KPD1930+2752: a rich, short-period pulsator in a close binary. Monthly Notices of the Royal Astronomical Society, 412 (1). pp. 371-390. ISSN 0035-8711 http://resolver.caltech.edu/CaltechAUTHORS:20110503-123117015
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KPD 1930+2752 is a short-period pulsating subdwarf B (sdB) star. It is also an ellipsoidal variable with a known binary period of 2.3 h. The companion is most likely a white dwarf and the total mass of the system is close to the Chandresekhar limit. In this paper, we report the results of Whole Earth Telescope (WET) photometric observations during 2003 and a smaller multisite campaign of 2002. From 355 h of WET data, we detect 68 pulsation frequencies and suggest an additional 13 frequencies within a crowded and complex temporal spectrum between 3065 and 6343 μHz (periods between 326 and 157 s). We examine pulsation properties including phase and amplitude stability in an attempt to understand the nature of the pulsation mechanism. We examine a stochastic mechanism by comparing amplitude variations with simulated stochastic data. We also use the binary nature of KPD 1930+2752 for identifying pulsation modes via multiplet structure and a tidally induced pulsation geometry. Our results indicate a complicated pulsation structure that includes short-period (≈16 h) amplitude variability, rotationally split modes, tidally induced modes and some pulsations which are geometrically limited on the sdB star.
|Additional Information:||© 2011 The Authors. Monthly Notices of the Royal Astronomical Society © 2011 RAS. Accepted 2010 October 22. Received 2010 October 22; in original form 2010 August 13. Article first published online: 15 Feb. 2011. This material is based upon work supported by the National Science Foundation under grant no. 0307480. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. This research was supported in part by NASA through the American Astronomical Society’s Small Research Grant Program. MDR was partially funded by a Summer Faculty Fellowship provided by Missouri State University and would like to acknowledge HELAS travel funding and Dr. Conny Aerts for helpful discussions. MAM, SLH, SP, JRE and ACQ were supported by the Missouri Space Grant Consortium, funded by NASA. We would also like to thank several other observers who assisted with observing, including E. Brassfield, D. McLemore, J. Peacock, R. Knight, T. Kawasaki, E. Hart, N. Purves, A. Nishimura, M. Hyogo and E. Rau.|
|Subject Keywords:||binaries: close; stars: general; stars: oscillations; subdwarfs; oscillations: individual: KPD 1930+2752|
|Official Citation:||Reed, M. D., Harms, S. L., Poindexter, S., Zhou, A.-Y., Eggen, J. R., Morris, M. A., Quint, A. C., McDaniel, S., Baran, A., Dolez, N., Kawaler, S. D., Kurtz, D. W., Moskalik, P., Riddle, R., Zola, S., Østensen, R. H., Solheim, J.-E., Kepler, S. O., Costa, A. F. M., Provencal, J. L., Mullally, F., Winget, D. W., Vuckovic, M., Crowe, R., Terry, D., Avila, R., Berkey, B., Stewart, S., Bodnarik, J., Bolton, D., Binder, P.-M., Sekiguchi, K., Sullivan, D. J., Kim, S.-L., Chen, W.-P., Chen, C.-W., Lin, H.-C., Jian, X.-J., Wu, H., Gou, J.-P., Liu, Z., Leibowitz, E., Lipkin, Y., Akan, C., Cakirli, O., Janulis, R., Pretorius, R., Ogloza, W., Stachowski, G., Paparo, M., Szabo, R., Csubry, Z., Zsuffa, D., Silvotti, R., Marinoni, S., Bruni, I., Vauclair, G., Chevreton, M., Matthews, J. M., Cameron, C. and Pablo, H. (2011), Whole Earth Telescope observations of the subdwarf B star KPD 1930+2752: a rich, short-period pulsator in a close binary. Monthly Notices of the Royal Astronomical Society, 412: 371–390. doi: 10.1111/j.1365-2966.2010.17912.x|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||03 May 2011 21:34|
|Last Modified:||03 May 2011 21:34|
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