Open AccessThe Cepheid period–luminosity zero‐point from radial velocities and Hipparcos proper motions
Author(s) -
Feast Michael,
Pont Frederic,
Whitelock Patricia
Publication year - 1998
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.1998.01912.x
Subject(s) - cepheid variable , physics , astrophysics , luminosity , zero (linguistics) , value (mathematics) , constant (computer programming) , zero point energy , astronomy , stars , statistics , galaxy , quantum mechanics , mathematics , linguistics , philosophy , computer science , programming language
A value for the zero‐point (ρ) of the Cepheid period–luminosity relation, < M V >= 2.81 log P + ρ, is deduced by comparing the value of the Oort constant, A , derived from radial velocities with that derived from Hipparcos proper motions. We find in this way that ρ =−1.47 ± 0.13, in excellent agreement with the value derived from Hipparcos trigonometrical parallaxes, ρ = −1.43 ± 0.10, by Feast &38; Catchpole in a recent paper.