Asteroseismology of massive stars: new insights of stellar interiors from their pulsations
| Main Author: | Bowman, D.M. |
|---|---|
| Format: | info Proceeding Journal |
| Bahasa: | eng |
| Terbitan: |
, 2021
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/5109690 |
Daftar Isi:
- Massive stars are important metal factories which provide energy and chemical feedback to their surroundings. However, stellar evolution models currently contain large theoretical uncertainties for physical mechanisms at work in the deep interiors of early-type stars. The uncertainties associated with interior rotation, chemical mixing and angular momentum transport propagate throughout their evolution making it difficult to accurately determine their masses and ages. The situation becomes more complex in the case of post-main sequence blue supergiant stars which may or may not be undergoing blue loops in the Hertzsprung-Russell diagram. However, the detection and analysis of coherent pulsation mode frequencies in early-type stars allows one to break model degeneracies, uniquely probe stellar interiors, and constrain largely- uncalibrated physical processes within stellar evolution models. In the case of pulsating stars in eclipsing binary and multiple systems, which allow additional independent constraints on stellar masses and radii, one can perform binary asteroseismology and tackle model uncertainties from a highly valuable perspective. In this review, I discuss the advances in our understanding of early-type stars by means of asteroseismology of their coherent pulsation modes. Forward asteroseismic modelling of detected pulsation mode frequencies in both single and multiple systems provides important constraints on ages, (core) masses, interior mixing and rotation profiles, and angular momentum transport. Constraints on the deep interiors of massive stars have been historically limited by a dearth of detected pulsations in these stars until recent space photometry missions such as CoRoT, Kepler/K2, BRITE and TESS. Modern space telescopes have revealed pulsations in many massive stars across different evolutionary stages, which includes the main sequence through to blue supergiant stars, and provides the opportunity to perform a data-driven empirical calibration of theoretical evolution models for the some of most massive and short- lived stars in the Universe.