A spectral study of Vega: A rapidly-rotating pole-on star

A spectral study of Vega: A rapidly-rotating pole-on star
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织女星的光谱研究:快速旋转的极对星

DOI:
10.1017/s1743921304004351
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发表时间:
2004
期刊:
Proceedings of the International Astronomical Union
影响因子:
--
通讯作者:
S. Adelman
S. Adelman
中科院分区:
--
文献类型:
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作者:
G. Hill;A. F. Gulliver;S. Adelman

文献摘要

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在波长范围内的超高信噪比,高色散光谱\mbox{$\lambda 4487 - 4553$}显示织女星是一颗快速旋转的恒星$(V_{\rm eq}\sim 160\,{\rm km\,s^{-1}})$几乎是极点。这些数据经过重新分析,结合对氢谱线(${\rm H}\gamma, {\rm H}\beta$和${\rm H}\alpha$)和织女星最新的绝对连续通量的分析,得出以下结果:$V \sin i=21.9\pm 0.1\,{\rm km\,s^{-1}}$,极地$T_{\rm eff}=9680\pm 10\,{\rm K}$,极地$\log g=4.00\pm 0.02\,{\rm dex}$, $V_{\rm eq}=160\pm 10\,{\rm km\,s^{-1}}$, $\xi_{\rm T}=1.08\pm 0.02\,{\rm km\, s^{-1}}$和$i=7.9\pm 0.5^{\circ}$。$T_{\rm eff}$和$\log g$在光球上的变化分别为350 K和0.06指数。平均值$T_{\rm eff}=9510\pm 10\,{\rm K}$和平均值$\log g=3.97\pm 0.02\,{\rm dex}$与这里和其他人得出的球面模型值一致。要搜索作者的其他文章,请访问:http://adsabs.harvard.edu/abstract_service.html
Ultra-high signal-to-noise, high dispersion spectroscopy over the wavelength range \mbox{$\lambda 4487 - 4553$} shows Vega to be a rapidly rotating star $(V_{\rm eq}\sim 160\,{\rm km\,s^{-1}})$ seen almost pole-on. These data, analyzed anew, are combined with analyses of the hydrogen lines (${\rm H}\gamma, {\rm H}\beta$ and ${\rm H}\alpha$) and the latest absolute continuum flux for Vega to yield the following results: $V \sin i=21.9\pm 0.1\,{\rm km\,s^{-1}}$, polar $T_{\rm eff}=9680\pm 10\,{\rm K}$, polar $\log g=4.00\pm 0.02\,{\rm dex}$, $V_{\rm eq}=160\pm 10\,{\rm km\,s^{-1}}$, $\xi_{\rm T}=1.08\pm 0.02\,{\rm km\, s^{-1}}$ and $i=7.9\pm 0.5^{\circ}$. The variations in $T_{\rm eff}$ and $\log g$ over the photosphere total 350 K and 0.06 dex, respectively. The mean $T_{\rm eff}=9510\pm 10\,{\rm K}$ and mean $\log g=3.97\pm 0.02\,{\rm dex}$ agree with the spherical model values derived here and by others.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html