The Binary Nature of the Ap Star 53 Cam
Abstract
The star 53 Cam HD 65339 (A2p, 6.2 mag.) has a longitudinal magnetic field which is uncommonly large compared with other magnetic Ap stars. Observed variations of the effective magnetic field and probably also the mean surface field can be represented satisfactorily well with the aid of a model, proposed by Oetken (1977), of an equatorially symmetric rotator. It appears, however, difficult to explain the behavior of the radial velocities exclusively on the basis of the rotator model. A number of spectral data are listed in a table. A systematic change in the radial velocities of the table shows that 53 Cam is probably a spectroscopic binary with a large eccentricity. The orbital elements derived with a period of 2380 days are listed in another table. Indications of tidal action are provided by the behavior of the radial velocities for neutral and ionized elements. The magnetic fields are also considered.
- Publication:
-
Astronomische Nachrichten
- Pub Date:
- 1978
- DOI:
- 10.1002/asna.19782990604
- Bibcode:
- 1978AN....299..305S
- Keywords:
-
- A Stars;
- Binary Stars;
- Magnetic Stars;
- Stellar Magnetic Fields;
- Stellar Rotation;
- Periodic Variations;
- Radial Velocity;
- Zeeman Effect;
- Astrophysics