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SDSS J233325.92+152222.1 and the evolution of intermediate polars
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Southworth, J. (John), Gänsicke, B. T. (Boris T.), Marsh, T. R., de Martino, D. and Aungwerojwit, A. (Amornrat) (2007) SDSS J233325.92+152222.1 and the evolution of intermediate polars. Monthly Notices of the Royal Astronomical Society, Vol.378 (No.2). pp. 635-640. doi:10.1111/j.1365-2966.2007.11796.x ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1111/j.1365-2966.2007.11796.x
Abstract
Intermediate polars (IPs) are cataclysmic variables which contain magnetic white dwarfs with a rotational period shorter than the binary orbital period. Evolutionary theory predicts that IPs with long orbital periods evolve through the 2-3 h period gap, but it is very uncertain what the properties of the resulting objects are. Whilst a relatively large number of long-period IPs are known, very few of these have short orbital periods. We present phase-resolved spectroscopy and photometry of SDSS J233325.92+152222.1 (SDSS J2333) and classify it as the IP with the shortest-known orbital period (83.12 +/- 0.09 min), which contains a white dwarf with a relatively long spin period (41.66 +/- 0.13 min). We estimate the white dwarf's magnetic moment to be mu(WD) approximate to 2 x 10(33) G cm(3), which is not only similar to three of the other four confirmed short-period IPs but also to those of many of the long-period IPs. We suggest that long-period IPs conserve their magnetic moment as they evolve towards shorter orbital periods. Therefore, the dominant population of long-period IPs, which have white dwarf spin periods roughly 10 times shorter than their orbital periods, will likely end up as short-period IPs like SDSS J2333, with spin periods a large fraction of their orbital periods.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QB Astronomy | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||
| Publisher: | Wiley | ||||
| ISSN: | 0035-8711 | ||||
| Official Date: | 21 June 2007 | ||||
| Dates: |
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| Volume: | Vol.378 | ||||
| Number: | No.2 | ||||
| Number of Pages: | 6 | ||||
| Page Range: | pp. 635-640 | ||||
| DOI: | 10.1111/j.1365-2966.2007.11796.x | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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