Abstract Details
| Name: Advik Gupta Affiliation: Indian Institute Of Technology (BHU) Varanasi Conference ID: ASI2025_598 Title : Detailed asteroseismic modeling and precise inferences of the physical properties of the benchmark subgiant μ Herculis Authors and Co-Authors : Advik Gupta 1, Kuldeep Verma 1 Abstract Type : Poster Abstract Category : Stars, Interstellar Medium, and Astrochemistry in Milky Way Abstract : The measurements of pressure mode and the so-called mixed mode oscillation frequencies of subgiant stars provide us with a unique opportunity to investigate the physical conditions in their deep interiors and also infer their global properties precisely. We present a detailed asteroseismic study of the benchmark subgiant μ Herculis based on the latest data from the SONG network. Since mixed mode frequencies are very sensitive to stellar internal structure and evolution, we computed a dense grid of stellar models and corresponding adiabatic oscillation frequencies. We carried out the glitch analysis to extract the properties of the helium ionization zone. The oscillation frequencies and measured helium glitch properties, along with effective temperature and metallicity, were fitted using Bayesian statistics. We find the mass, radius, and age of μ Herculis to be 1.11^{+0.05}_{-0.02},1.71^{+0.03}_{-0.02} and 8.4^{+0.4}_{-0.1} respectively. The inferred surface and initial helium mass fractions are 0.24^{+0.01}_{-0.02} and 0.29^{+0.01}_{-0.03} respectively. We also observe a significant discrepancy between the observed extent of the helium ionization zone and that predicted by the stellar models, highlighting potential shortcomings in the models. In this presentation, I will discuss the application of asteroseismology and the corresponding stellar modeling approach for our target μ Herculis subgiant star. |