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

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

2011-11-09

arxiv.org/abs/1111.2094v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

8 pages, 4 figures and 1 table. Proceeding submitted for the 9th Pacific Rim Conference on Stellar Astrophysics (PRCSA2011), L

Scientific paper

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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