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Photometric and spectroscopic observations of the variable star ET And. II

✍ 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

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✦ 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.


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