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arXiv 1111.2094astro-ph.SR
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中央大学造父变星研究的新进展：从斯皮策到开普勒

Recent Progress of Cepheid Research at National Central University: From Spitzer to Kepler

Chow-Choong Ngeow

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8 pages, 4 figures and 1 table. Proceeding submitted for the 9th Pacific Rim Conference on Stellar Astrophysics (PRCSA2011), Lijiang, China, April 2011
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摘要：

在这个报告中，我总结了最近在国立中央大学进行的造父变星研究工作。造父变星的中红外周期光度（P-L）关系在詹姆斯·韦伯太空望远镜时代的距离尺度工作中非常重要，因为这些关系有可能在~2%的精度内导出哈勃常数-这是精密宇宙学的一个关键约束。因此，我们推导出中红外P-L关系的造父变星在大麦哲伦云和小麦哲伦云，使用档案数据从斯皮策太空望远镜。开普勒太空望远镜是美国宇航局的一项任务，通过在一个专门的天空区域连续观察恒星，在类似太阳的恒星周围寻找地球大小和更大的行星。因此，几乎不间断的观测也用于恒星变化和星震学研究。然而，开普勒观测是用一个单一的宽带滤波器进行的，因此需要地面跟踪观测来补充开普勒光变曲线，以充分描述目标恒星的特性。在这里，我介绍了位于开普勒视场内的两个造父变星候选者的地面光学跟踪观测。结合开普勒光变曲线，我们的地面数据排除了V2279 Cyg是造父变星的可能性。因此，V1154 Cyg是开普勒视野中唯一的造父变星。

英文摘要：

In this presentation I summarize recent work on Cepheid research carried out at the National Central University. The mid-infrared period-luminosity (P-L) relations for Cepheids are important in the James Webb Space Telescope era for distance scale work, as the relations have potential to derive the Hubble constant within ~2% accuracy - a critical constraint in the precision cosmology. Consequently, we have derived the mid-infrared P-L relations for Cepheids in the Large and Small Magellanic Clouds, using archival data from the Spitzer Space Telescope. Kepler Space Telescope is a NASA mission to search for Earth-size and larger planets around Sun-like stars, by observing continuously the stars in a dedicated patch of the sky. As a result, the almost un-interrupted observation is also used for stellar variability and asteroseismological study. However, Kepler observations are carried out with a single broad-band filter, hence ground-based follow-up observation needed to complement Kepler light curves to fully characterize the properties of the target stars. Here I present the ground-based optical follow-up observations for two Cepheid candidates located within the Kepler's field-of-view. Together with Kepler light curves, our ground-based data rule out V2279 Cyg being a Cepheid. Hence V1154 Cyg is the only Cepheid in the Kepler's field.

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