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Swift J201424 .9+152930:发现一个新的具有491 s和3.4 h调制的深度食双星

Swift J201424.9+152930: discovery of a new deeply eclipsing binary with 491 s and 3.4 h modulations

P. Esposito, G. L. Israel, D. de Martino, P. D'Avanzo, V. Testa, L. Sidoli, R. Di Stefano, A. Belfiore, M. Mapelli, S. Piranomonte, G. A. Rodríguez Castillo, A.… 展开作者

P. Esposito, G. L. Israel, D. de Martino, P. D'Avanzo, V. Testa, L. Sidoli, R. Di Stefano, A. Belfiore, M. Mapelli, S. Piranomonte, G. A. Rodríguez Castillo, A. Moretti, V. D'Elia, F. Verrecchia, S. Campana, N. Rea

摘要:

我们报告了一个新的X射线衍射仪Swift J201424.9+152930(Sw J2014)的发现。由于它的X射线调制在491秒,它是在系统搜索斯威夫特X射线望远镜的档案数据中的相干信号时发现的。为了研究Sw J2014的性质,我们使用空间(Swift和XMM-牛顿)和地面(1.5米Loiano望远镜和3.6米Telescopio Nazionale Galileo)仪器进行了多波长跟踪观测。Sw J2014的X射线光谱可以用硬的和高度吸收的幂律来描述。光学观测使得有可能挑出光学对应的这个来源,它显示了几个可变的发射线和日全食持续约20分钟。对日食的研究使我们能够推断出第二个周期为3.44小时,我们将其解释为近距离双星系统的轨道周期。我们还发现,该期间没有显着改变了约7年的时间跨度。基于Sw J 2014的时间特征,以及它的光学和X射线光谱特性,我们认为它是一个拥有吸积磁性白矮星的近距离双星。因此,该系统是一个中极型的激变变星,也是极少数显示深食的变星之一。

英文摘要:

We report on the discovery of a new X-ray pulsator, Swift J201424.9+152930 (Sw J2014). Owing to its X-ray modulation at 491 s, it was discovered in a systematic search for coherent signals in the archival data of the Swift X-ray Telescope. To investigate the nature of Sw J2014, we performed multi-wavelength follow-up observations with space-borne (Swift and XMM-Newton) and ground-based (the 1.5-m Loiano Telescope and the 3.6-m Telescopio Nazionale Galileo) instruments. The X-ray spectrum of Sw J2014 can be described by a hard and highly absorbed power law. The optical observations made it possible to single out the optical counterpart to this source, which displays several variable emission lines and total eclipses lasting ~20 min. Total eclipses of similar length were observed also in X-rays. The study of the eclipses, allowed us to infer a second periodicity of 3.44 h, which we interpret as the orbital period of a close binary system. We also found that the period has not significantly changed over a ~7 yr timespan. Based on the timing signatures of Sw J2014, and its optical and X-ray spectral properties, we suggest that it is a close binary hosting an accreting magnetic white dwarf. The system is therefore a cataclysmic variable of the intermediate polar type and one of the very few showing deep eclipses.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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