论文标题
磁门控积分模型：应用于中间极性V1223 SGR中的短爆发
Magnetically-gated accretion model: application to short bursts in the intermediate polar V1223 Sgr
论文作者
论文摘要
一些中间的极点爆发比正常矮人中观察到的短得多，并且其起源长期以来一直没有降级。我们在这里检查了V1223 SGR的情况，V1223 SGR是一种中间极性，在1984年显示出短暂的爆发，并将爆发特征与磁层门层门层模型的预测进行了比较。我们使用来自AAVSO的档案数据，从中提取爆发概况。我们使用代码来计算白矮星磁场截断的积聚盘的时间依赖性演变，使用对圆盘和磁场之间的相互作用的简单描述，如D'Antona和Spruit（2010）所示。我们发现V1223 SGR经历了一系列的短爆发，持久持续时间通常为两到三个小时，并且衰减略长。当应用于中间极点时，D'Antona和Spruit（2010）的模型很好地说明了观察到的爆发持续时间和强度。但是，我们确认模型结果敏感地取决于相当受约束的模型的假设。我们还搜索了AAVSO数据库中的其他IP中的短爆发，识别了FO AQR，TV COL，NY LUP和EI UMA中的单个短爆发，但没有在V1223 SGR中观察到的序列。我们还找到了一个超爆炸，然后在CTCV J2056-3014中进行了反弹。尽管磁性门控积分不稳定性模型显然是V1223 SGR短爆发的系列原因，并且很可能是其他中间极点中的类似事件，但描述该过程的模型需要改善，特别是关于白紫色磁场与积光光盘的相互作用。这项艰巨的任务可能会受益于模型结果的进一步比较，而其他观察结果具有良好的时间覆盖范围和时间分辨率。
Some intermediate polars show outbursts that are much shorter than those observed in normal dwarf novae, and whose origin has remained unelucidated for a long time. We examine here the case of V1223 Sgr, an intermediate polar that showed a short outburst in 1984, and compare the outburst characteristics with the predictions of the magnetospheric gating model. We use the archival data from the AAVSO from which we extract the outburst profiles. We use our code for computing the time-dependent evolution of an accretion disc truncated by the white dwarf magnetic field, using a simple description of the interaction between the disc and the magnetic field, as in D'Antona and Spruit (2010). We find that V1223 Sgr underwent a series of short outbursts, with a rise lasting for typically two to three hours, and a slightly longer decay. When applied to intermediate polars, the model by D'Antona and Spruit (2010) accounts well for the observed outburst duration and intensity. We confirm, however, that the model outcome depends sensitively on the rather poorly constrained model's assumptions. We have also searched the AAVSO database for short outbursts in other IPs, identifying individual short outbursts in FO Aqr, TV Col, NY Lup and EI UMa, but no series as those observed in V1223 Sgr. We also found a superoutburst, followed by a reflare in CTCV J2056-3014. Although the magnetic-gating accretion instability model is clearly responsible for the series of V1223 Sgr short outbursts and most probably for similar events in other intermediate polars, the model describing this process needs improving, in particular concerning the interaction of the white-dwarf's magnetic field with the accretion disc. This difficult task might benefit from further comparison of the model outcome with additional observations having good time coverage and time resolution.
