## Abstract Spectroscopic and photometric observations of the variable ET And were carried out in the years 1981/82. In addition to the known periodical variation of the radial velocities of 48.308 days produced by a companion and the photometric period of 1.61883 days probaly resulting from the ro
Photometric and spectroscopic observations of the variable star ET And. II
β Scribed by G. Scholz; E. Gerth; K. P. Panov
- Publisher
- John Wiley and Sons
- Year
- 1985
- Tongue
- English
- Weight
- 624 KB
- Volume
- 306
- Category
- Article
- ISSN
- 0004-6337
No coin nor oath required. For personal study only.
β¦ Synopsis
New spectroscopic and photometric observations of the variable Ap star ET And carried out 1982 and 1983 confirm once again the existence of short-time variations. Iior the radial velocity variations a period of 0.19771 days and for the light variations a period of 0.0989 days was found. Some spectrograms show a velocity progression of the Balmer lines. The gradient is of such a kind that thc radial velocity values increase from the line 13, to l-Ilb. Different models for the interpreation of the velocity progression are discussed.
Neue spektroskopische und photometrische Beobachtungen des variablen Ap Sterns.ET And, die in den Jahren 1982 und 1983 erhalten wurden, bestatigen erneut die Existenz von kurzzeitigen Variationen. Fur die Radialgeschwindigkeitsanderungen erhalten wir eine Periode von 0.197 71 Tagen und fur die Helligkeitsanderungen eine solche von 0.0989 Tagen. Einige Spektrogramme zcigcn cine Geschwindigkeitsprogression der Balmerlinien. Der Gradient ist von der Art, dalj die Radialgescliwindigkeitswerte ansteigen von dcr Linie H, zu H15. Fur eine Erklarung der Geschwindigkeitsprogression werden verschiedene Modelle diskutiert.
π SIMILAR VOLUMES
## Abstract The discovery of exotic abundances, chemical inhomogeneities, and weak magnetic fields on the surface of late Bβtype primaries in spectroscopic binaries has important implications not only for our understanding of the formation mechanisms of stars with Hg and Mn peculiarities themselves