2007MNRAS.378..635S -
Mon. Not. R. Astron. Soc., 378, 635-640 (2007/June-3)
SDSS J233325.92+152222.1 and the evolution of intermediate polars.
SOUTHWORTH J., GANSICKE B.T., MARSH T.R., DE MARTINO D. and AUNGWEROJWIT A.
Abstract (from CDS):
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 2-3h 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 SDSSJ233325.92+152222.1 (SDSSJ2333) and classify it as the IP with the shortest-known orbital period (83.12±0.09min), which contains a white dwarf with a relatively long spin period (41.66±0.13min). We estimate the white dwarf's magnetic moment to be µWD~ 2 x 1033 G.cm3, 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 SDSSJ2333, with spin periods a large fraction of their orbital periods.
Abstract Copyright:
2007 The Authors. Journal compilation © 2007 RAS
Journal keyword(s):
binaries: close - stars: individual: SDSS J233325.92+152222.1 - stars: magnetic fields - novae, cataclysmic variables - white dwarfs
Simbad objects:
10
Full paper
View the references in ADS
To bookmark this query, right click on this link: simbad:2007MNRAS.378..635S and select 'bookmark this link' or equivalent in the popup menu