The evolution of Nova V382 Velorum 1999
The evolution of Nova V382 Velorum 1999
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Nova V382 Velorum 1999 的演变
DOI：
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发表时间：
2002
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影响因子：
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通讯作者：
Robert Williams
中科院分区：
文献类型：
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作者：
M. Valle;L. Pasquini;D. Daou;Robert Williams
我们报告的光谱观测V382 Vel（新星Vel 1999年）在拉西拉进行5和498天之间的最大光（1999年5月23日，V（最大）2：3 0：1）。光度和光谱演化的分析表明，该天体是一颗属于Fe II宽光谱类的快速新星。根据最大星等与下降速率的关系，在校正了朝向新星的小变红后，E（B V）< 0：10，得出距离为1.7千秒差距（20%）。从测量的氢通量和相应的膨胀率，我们推导出一个近似的喷射壳层的质量，Menv < 10 5 M。我们还观察到在早期衰退期间，在6705-6715 A处有一个广泛的、短暂的（<2周）特征，对此有几种可能的识别，其中之一是在6708 A处的锂双峰，这可能会对快速新星爆发期间可能发生的锂产生产生施加经验限制。V382 Vel的最大光度Mv= 8：9，在银道面以上的高度相对较小（z< 160 pc），这表明它起源于一颗质量很大的白色矮星，质量可能在1.1-1.2 M之间。
We report results of spectroscopic observations of V382 Vel (Nova Vel 1999) carried out at La Silla between 5 and 498 days after maximum light (23 May 1999, V(max) 2:3 0:1). The analysis of the photometric and spectroscopic evolution shows this object to be a fast nova belonging to the Fe II broad spectroscopic class. A distance of 1.7 kpc (20%) is derived from the maximum magnitude vs. rate of decline relationship after correcting for the small reddening toward the nova, E(B V)< 0:10. From the measured H flux and the associated rate of expansion we derive an approximate mass for the ejected shell, Menv < 10 5 M. We have also observed during the early decline a broad, short-lived (<2 weeks) feature at 6705-6715 A for which several identifications are possible, one of which is the lithium doublet at 6708 A and which could place an empirical limit on the lithium production that might occur during the outburst of a fast nova. The high luminosity at maximum, Mv= 8:9, and the relatively small height above the galactic plane (z< 160 pc) suggest that V382 Vel originated from a massive white dwarf, likely in the mass range 1.1-1.2 M.