Poster
M. T. Clara, M. S. Cunha, P. P. Avelino, T. L. Campante, S. Deheuvels, D. R. Reese
Abstract
Tests ran on classical interpolation algorithms using stellar subgiant grids with the
typical resolution have revealed the algorithms' inadequacy in retaining l=1 mode frequencies
within the precision expected from long-term space-based observations (~0.1 μHz). The
interpolation errors are particularly concerning in the case of the mass-tracks associated with
the transition between radiative and convective cores during the main-sequence. In this case,
they are systematic thoughtout all of the subgiant phase, reaching maxima of 7.5 μHz. In this
poster, we show that these large systematic errors stem from the drastic change in the core
structure in adjacent mass tracks when the interface between convective cores and radiative
interiors during the main-sequence is modelled by an exponential diffusive overshoot with a
convective core overshoot parameter, f_ov. Moreover, we discuss how the convective overshoot
parameter f_ov influences interpolation on a typical grid of subgiant models, and how the
problems created by less-educated guesses of its value can be improved on. Additionally, we
explore the possibility of creating a grid of subgiant models where f_ov is dependent on the
mass, as discussed in Claret & Torres (2018), and highlight the benefits associated with this
approach.
8th TESS/15th Kepler Asteroseismic Science Consortium Workshop
Porto, Portugal
2024 July
