arXiv 1111.66782011-11-29astro-ph.SR

寻找SW性类型明星

The Search for SW Sex Type Stars

Linda Schmidtobreick, Pablo Rodriguez-Gil, Boris T. Gaensicke

备注：: 4 pages, 2 figures, conference proceedings

摘要：

所有在2.8- 4小时轨道周期范围内的类食新星都属于SW性星，因此经历了非常高的质量转移率。由于恒星的物理性质应该独立于它被观测到的倾角，这意味着在这个周期范围内的所有或至少大部分的非磁性或弱磁性激变变星都是SW性星。在这里，我们提出了一个大型活动的初步结果，寻找SW性别特征的光谱中这样的恒星。我们发现18个观测到的非食激变变星中有14个属于西南性星群，另外4个的分类是不确定的。这证实了SW性明星的统治时期范围内的2.8-4小时以上的周期差距。由于所有的长周期系统在进入空区之前都需要穿过这个范围，因此SW Sex现象很可能是激变变星生命中的一个进化阶段。

英文摘要：

All eclipsing nova-likes in the 2.8-4h orbital period range belong to the group of SW Sex stars, and as such experience very high mass transfer rates. Since the physical properties of a star should be independent of the inclination it is observed at, this suggests that all or at least a large fraction of the non- or weakly-magnetic cataclysmic variables in this period range are physically SW Sex stars. We here present preliminary results of a large campaign to search for SW Sex characteristic features in the spectra of such stars. We find that 14 out of the 18 observed non-eclipsing cataclysmic variables belong to the group of SW Sex stars the classification of the other four is uncertain from our data. This confirms the domination of SW Sex stars in the period range of 2.8-4 h just above the period gap. Since all long-period systems need to cross this range before entering the gap, the SW Sex phenomenon is likely to be an evolutionary stage in the life of a cataclysmic variable.

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