Superhumps and spin-period variations in the intermediate polar RX J2133.7+5107
| Autor: | John Rock, Robert Koff, Tut Campbell, J. L. Jones, Etienne Morelle, D. Lemay, Joseph Patterson, Kenneth Menzies, D. Cejudo, David Boyd, G. Myers, George Roberts, William Stein, E. de Miguel, Richard Sabo, T. Krajci, D. Barrett, Joseph Ulowetz |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
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| Zdroj: | Arias Montano. Repositorio Institucional de la Universidad de Huelva instname |
| Popis: | We report the results of long-term time series photometry on RX J2133.7+5107, an intermediate polar distinguished by its long orbital period (7.14 h) and rapid rotation (571 s) of its white dwarf. The light curves show the presence of a conspicuous modulation with a 6.72-h period, 6.1 ± 0.1 per cent shorter than the orbital period, which we interpret as a (negative) superhump associated with the nodal precession of the accretion disc. This detection may prove a challenge to the idea that superhumps are limited to binaries of short orbital period. Our rotational timings over the 7 yr spanned by our observations show spin-up at a rate of 3.41(2) ms yr-1 or, equivalently, on a time-scale |P/P?|=0.17×106 yr. The latter is sensibly shorter than the time-scale of spin period variations reported for other intermediate polars, possibly due to a greater accretion rate. We thank the National Science Foundation for support of this research (AST-1211129 and AST-1615456), and NASA through HST-G0-13630. EdM acknowledges financial support from the Ministerio de Educacion, Cultura y Deporte (Spain) under the Mobility Program Salvador de Madariaga (PRX15/00521). |
| Databáze: | OpenAIRE |
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