Is evidence for enhanced mass transfer during dwarf-nova outbursts well substantiated?
Is evidence for enhanced mass transfer during dwarf-nova outbursts well substantiated?
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DOI：
10.1051/0004-6361:20030115
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发表时间：
2003-02
影响因子：
6.5
通讯作者：
Y. Osaki;F. Meyer
中科院分区：
文献类型：
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作者：
Y. Osaki;F. Meyer
讨论了SU-UMA型矮新星的爆发机制。提出了两种相互竞争的模型：称为热潮不稳定模型(TTI模型)的纯圆盘不稳定性模型(TTI模型)和强化传质模型(EMT模型)。对次级恒星爆发期间质量传递增强的观测证据进行了严格的检验。结果表明，大多数关于强化传质的证据并不充分。Patterson等人。(2002)最近声称发现了2001年WZ SGE爆发期间质量传递增强的证据。我们表明，他们的证据可能是由于对他们观察到的光曲线的曲解。我们的理论分析还表明，突出过程中的辐射应该不会影响传质速率。对TTI模型进行了改进，可以解释为什么某些SU-UMA恒星在超暴最大值几天后才出现超峰。我们基于TTI模型对2001年WZ SGE爆发的总体发展提出了自己的解释，该模型不需要假设未经证实的增强质量传递。
Outburst mechanisms of SU UMa-type dwarf novae are discussed. Two competing models were proposed; a pure disk instability model called the thermal-tidal instability model (TTI model) and the enhanced mass transfer model (EMT model). Observational evidence for enhanced mass transfer from the secondary star during outbursts is critically examined. It is demonstrated that most evidence for enhanced mass transfer is not well substantiated. Patterson et al. (2002) have recently claimed to have found evidence for enhanced mass transfer during the 2001 outburst of WZ Sge. We show that their evidence is probably due to a misinterpretation of their observed light curves. Our theoretical analysis also shows that irradiation during outburst should not affect the mass transfer rate. A refinement of the TTI model is proposed that can explain why superhumps appear a few days after the superoutburst maximum in some SU UMa stars. We present our own interpretation of the overall development of the 2001 outburst of WZ Sge based on the TTI model that does not require the assumption of an unproved enhanced mass transfer.