On the Application of Wesenheit Function in Deriving Distance to Galactic Cepheids

Details On the Application of Wesenheit Function in Deriving Distance to Galactic Cepheids On the Application of Wesenheit Function in Deriving Distance to Galactic Cepheids

2012-02-02

arxiv.org/abs/1202.0339v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

ApJS accepted, 9 pages with 4 tables and 9 figures

Scientific paper

In this work, we explore the possibility of using the Wesenheit function to derive individual distances to Galactic Cepheids, as the dispersion of the reddening free Wesenheit function is smaller than the optical period-luminosity (P-L) relation. When compared to the distances from various methods, the averaged differences between our results and published distances range from -0.061 to 0.009, suggesting that the Wesenheit function can be used to derive individual Cepheid distances. We have also constructed Galactic P-L relations and selected Wesenheit functions based on the derived distances. A by-product from this work is the derivation of Large Magellanic Cloud distance modulus when calibrating the Wesenheit function. It is found to be 18.531 \pm 0.043 mag.

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