2006/11/30 by J. Robert Buchler, Robert Szabo · 31 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Beat (acoustics) #Cepheid variable #Diagram #Galaxy #Hertzsprung–Russell diagram #Metallicity #Scientific Research and Discoveries #Stars #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1086/513071
published in The Astrophysical Journal 660(1), 723-731 (IOP Publishing) · 9 pages, 12 color figures (black and white version available from 1st author's website). With minor revisions. to appear in ApJ
arxiv created 2007/01/12 · openalex publication_date 2007/04/20 · arxiv updated 2011/02/11 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The mere location of a beat Cepheid model in a period ratio versus period diagram (Petersen diagram) puts very tight constraints on its metallicity Z . The beat Cepheid Petersen diagrams are revisited with linear nonadiabatic turbulent convective models, and their accuracy as a probe for stellar metallicity is evaluated. They are shown to be largely independent of the helium content Y , and they are also only weakly dependent on the mass-luminosity relation that is used in their construction. However, they are found to show sensitivity to the relative abundances of the elements that are lumped into the metallicity parameter Z . Rotation is estimated to have but a small effect on the "pulsation metallicities." A composite Petersen diagram is presented that allows one to read off upper and lower limits on the metallicity Z from the measured period P 0 and period ratio P 10 .