V463 Scuti (Nova Sct 2000): Rapidly Evolving Nova with a Prominent Premaximum Halt
V463 Scuti (Nova Sct 2000): Rapidly Evolving Nova with a Prominent Premaximum Halt
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V463 Scuti (Nova Sct 2000)：快速演化的新星，具有显着的前最大停止
DOI：
10.1093/pasj/54.6.1009
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发表时间：
2002
影响因子：
2.3
通讯作者：
Seiichiro Kiyota
中科院分区：
文献类型：
--
作者：
Taichi Kato;Makoto Uemura;K. Haseda;Hitoshi Yamaoka;K. Takamizawa;Mitsugu Fujii;Seiichiro Kiyota
我们总结了V463 Sct（Nova Sct 2000）的光度和光谱观测，它最初被认为是一个红变星。2000年3月16.81 UT拍摄的光谱显示出突出的发射线，FHWM为990 km/s（H alpha）。光变曲线显示出一个明显的极大前停顿持续至少24天，和一个后期阶段耀斑样的最大值。然后新星开始以t2 = 15 +/- 3 d的速度迅速衰落。长的极大前停顿被认为是“最慢”新星的独特特征。然而，目前的观察表明，长的极大前停顿并不是最慢的新星的独特特征，而是一种比以前认为的更普遍的现象，在更广泛的新星速度类别中传播。最近对前极大停止的解释要求热核失控的条件仅仅是勉强满足。由于这种条件在快速演化的新星中更难满足，V463 Sct将为测试这种解释提供一个独特的机会。早期爆发后的光谱显示共存的Fe II线和一些禁止线，这表明，大量的材料可能已被喷射之前，观察到的光学最大值。现代全球网络（VSNET）的短暂对象的验证过程的影响进行了简要的讨论。
We summarize photometric and spectroscopic observations of V463 Sct (Nova Sct 2000), which was originally thought to be a red variable. The spectrum taken on 2000 March 16.81 UT showed prominent emission lines with a FHWM of 990 km/s (H alpha). The light curve shows a conspicuous premaximum halt lasting at least for 24 d, and a late-phase flare-like maximum. The nova then started rapidly fading at a rate corresponding to t2 = 15 +/- 3 d. Long premaximum halts have been considered as a unique character of the "slowest" novae. The present observation, however, suggests that the long premaximum halts are not a unique character of the slowest novae, but a more general phenomenon spreading over a wider range of nova speed classes than has been previously believed. A recent interpretation of premaximum halts requires that the conditions of thermonuclear runaway was only marginally satisfied. Since such conditions are more difficult to meet in rapidly evolving novae, V463 Sct would provide an unique opportunity in testing this interpretation. The early post-outburst spectrum showed co-existence of Fe II lines and some forbidden lines, which suggests that substantial amount of material may have been ejected before the observed optical maximum. The impact of the modern global network (VSNET) on confirmatory processes of transient objects is briefly discussed.