The relationship between nu_max and age t of stars from MS

Yanke Tang, Department of Physics, Dezhou University

Abstract
Stellar age is important physics quantity in astrophysics, which is useful for many fields not only in Universe but also galaxies. It can not be determined by direct measurements but can only be estimated or inferred. We attempt to develop a useful indicator of stellar age. Using model-grid-based method for parameter determinations, we obtain the frequency of maximum power nu_max combined with scaling laws and find that nu_max are tightly correlated and decreases monotonically with age of star, which mass less than 1.5 M from main-sequence to red-giants evolutionary stages. For the star, which mass are more than 1.5M, we find that nu_max are tightly correlated and decreases monotonically with age of star from main-sequence to red-giants evolutionary stages except for the star, which are in bump. Interestingly, we find two peaks which are correspond to the points, the turn off of main sequence and bump of red giants, in the nu_max vs. t diagram. Meanwhile, we study the influence of evolution and metallicity on the asteroseismic quantities nu_max vs. t relation.