An astrometric, spectroscopic, and spectropolarimetric study of a binary with two magnetic pulsating components: the delta Scuti variable HD 21190 and CPD -83 64B
1 : Leibniz-Institut fuer Astrophysik Potsdam, Germany
(AIP)
HD21190 is a member of a visual binary system and is a known delta~Scuti
variable star showing Ap star characteristics. Using an astrometric analysis, we
showed that the this star forms a physical binary system with the nearby
companion CPD -83 64B at an angular distance of about 19". Our recent HARPS
spectropolarimetric observations of this system reveal the presence of a
magnetic field in both components. Furthermore, also the component CPD -83 64B
exhibits pulsations. A careful study of binary components with a common
evolutionary path is especially important to understand the complex interplay
between stellar pulsations, magnetic fields, and chemical composition.
| Subject : | : | Posters |
| Topics | : | Hunt for binaries and transient sky |
| Keywords | : | binaries ; magnetic fields ; pulsations ; chemical abundances |
| PDF version | : |  PDF version |
