The Cepheid PL zero-point based on the revised Hipparcos trigonometrical parallaxes  

作　　者：ZHANG Hong ZHU Zi 

机构地区：[1]Department of Astronomy, Nanjing University, Nanjing 210093, China

出　　处：《Chinese Science Bulletin》2009年第20期3790-3794,共5页

基　　金：Supported by the National Natural Science Foundation of China (Grant No. 10673005);Foundation of the Chinese Academy of Sciences (Grant No. KJCX2-YW-T13)

摘　　要：Revised Hipparcos data were released by van Leeuwen in 2007.In this article revised Hipparcos trigo-nometrical parallaxes are used to derive a period-luminosity zero-point in the optical V band.Adopting a fixed slope of -2.81 from the LMC,a zero-point value of ρ= -1.37±0.07 is derived based on the method by Feast and Catchpole(1997).This value yields an LMC distance modulus of 18.64 mag,which makes a minor change in H0 expected from Feast and Catchpole's result in 1997.Revised Hipparcos data were released by van Leeuwen in 2007. In this article revised Hipparcos trigonometrical parallaxes are used to derive a period-luminosity zero-point in the optical V band. Adopting a fixed slope of -2.81 from the LMC, a zero-point value of p= -1.37＋0.07 is derived based on the method by Feast and Catchpole （1997）. This value yields an LMC distance modulus of 18.64 mag, which makes a minor change in H0 expected from Feast and Catchpole＇s result in 1997.

关 键 词：三角视差 修订 零点 

分 类 号：P144.6[天文地球—天体物理] O174.52[天文地球—天文学]