Early post-maximum spectral evolution of the fast novae V4742 Sagittarii and V4743 Sagittarii
Early post-maximum spectral evolution of the fast novae V4742 Sagittarii and V4743 Sagittarii
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快速新星 V4742 Sagittarii 和 V4743 Sagittarii 的早期极大值光谱演化
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
J. Prigge
中科院分区：
文献类型：
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作者：
G. E. Morgan;F. Ringwald;J. Prigge
人马座V4742和V4743在2002年9月爆发，相隔不到一周。本文收集了早期的国际天文学联合会圆形观测，绘制光变曲线，并提出了我们自己的光谱这些新星。这些光谱是用业余天文学家可以买到的设备收集的。我们确定的主要光谱发射线，测量全宽半最大值，速度宽度和等效宽度。这两颗新星都显示出快速的Duerbeck A型光变曲线。V4743 Sgr的爆发符合威廉姆斯等人提出的新星光谱分类方案，主要的Fe II光谱让位于极光光谱。我们只观察到V4742 Sgr中的主要Fe II相，在此期间，其He I 706.5 nm发射线出现较早，然后沿着与Fe II络合物一起褪色。这与V4743 Sgr的光谱演化不同，在V4743 Sgr中，He I 706.5 nm的谱线在Fe II络合物消失后出现。
The novae V4742 and V4743 Sagittarii (Sgr) erupted less than a week apart in 2002 September. This paper collects together early IAU Circular observations, plots light curves, and presents our own spectra of these novae. The spectra were collected with equipment commercially available to amateur astronomers. We identify the major spectral emission lines, measuring full widths at half-maximum, velocity widths and equivalent widths. Both novae displayed fast Duerbeck type A light curves. The eruption of V4743 Sgr fits into the spectral classification scheme for novae proposed by Williams et al. with a principal Fe II spectrum giving way to an auroral spectrum. We observed only the principal Fe II phase in V4742 Sgr, during which its He I 706.5-nm emission line appeared early then faded along with the Fe II complex. This was unlike the spectral evolution of V4743 Sgr, in which the He I 706.5-nm line emerged after the Fe II complex diminished.