The origin of light variability in Ap stars
| Authors | |
|---|---|
| Year of publication | 2014 |
| Type | Article in Proceedings |
| Conference | Putting A Stars into Context: Evolution, Environment, and Related Stars |
| MU Faculty or unit | |
| Citation | |
| Web | http://adsabs.harvard.edu/abs/2014psce.conf..205K |
| Field | Astronomy and astrophysics |
| Keywords | chemically peculiar stars; light variability; model atmospheres |
| Description | The usual photometric variability detected in Ap stars is that associated with rotation. It has long been surmised that redistribution of rotationally modulated flux in surface abundance spots is the cause of that type of variability. The redistribution is caused by bound-bound (line) and bound-free (continuum) transitions of various elements, in particular helium, silicon, iron, and (obviously) also rare-earth elements. With the availability of detailed abundance maps, complete atomic data, and detailed model atmospheres it has now become possible to simulate reliably the photometric variability due to rotation. This is demonstrated by the example of several CP stars. We generalise these result and discuss the importance of individual elements in terms of their dependence on effective temperature. We emphasise the importance of light curve prediction for testing surface abundance maps and the atomic data. |
| Related projects: |