论文标题
[WC]恒星在麦哲伦云中的快速发展
Rapid evolution of [WC] stars in the Magellanic Clouds
论文作者
论文摘要
我们获得了南非大型望远镜的14个麦哲伦云行星星云的新光谱，以确定其中心恒星的加热速率，并验证偶然后的杂物后巨型分支星星的进化模型。我们将新光谱与往年的观察结果进行了比较。随着时间的流逝，五个行星星云显示出激发的增加。他们的四个中央恒星在光谱中展示了[WC]的特征，其中包括三个新检测。这使麦哲伦云中普氏菌群的[WC]中心星的总数达到了十。我们比较了四个[WC]中心恒星的加热速率与He燃烧后的巨型分支进化轨道和剩下的恒星，并带有H燃烧轨道。确定的加热速率与H和HE燃烧后的杂物后巨型分支星的进化模型一致。显示激发最快增加的pne的中心恒星在样品中也是最发光的。这表明麦哲伦云中的[WC]中心恒星比H燃烧的中心星的发展速度更快，它们起源于更大的祖细胞。
We obtained new spectra of fourteen Magellanic Cloud planetary nebulae with the South African Large Telescope to determine heating rates of their central stars and to verify evolutionary models of post-asymptotic giant branch stars. We compared new spectra with observations made in previous years. Five planetary nebulae showed an increase in excitation over time. Four of their central stars exhibit [WC] features in their spectra, including three new detections. This raises the total number of [WC] central stars of PNe in the Magellanic Clouds to ten. We compared determined heating rates of the four [WC] central stars with the He-burning post-asymptotic giant branch evolutionary tracks and the remaining star with the H-burning tracks. Determined heating rates are consistent with the evolutionary models for both H and He-burning post-asymptotic giant branch stars. The central stars of the PNe that show the fastest increase of excitation are also the most luminous in the sample. This indicates that [WC] central stars in the Magellanic Clouds evolve faster than H-burning central stars, and they originate from more massive progenitors.
