THE PERIOD OF ETA AQUILAE AND THE BEHAVIOR OF ITS HYDROGEN LINES

New radial-velocity measurements for the seven-day Cepheid η Aql concentrated during rising light have been made in 1984-85. This allows a redetermination of the period which is continuing to increase but somewhat more slowly than previously reported. The hydrogen lines show an increasing velocity o...

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Veröffentlicht in:	Publications of the Astronomical Society of the Pacific 1987-02, Vol.99 (612), p.138-140
Hauptverfasser:	JACOBSEN, THEODOR S., WALLERSTEIN, GEORGE
Format:	Artikel
Sprache:	eng
Schlagworte:	Astronomy Cepheids Cepheids (delta cephei, w virginis) Earth, ocean, space Exact sciences and technology Fall lines Hydrogen Light Mathematical intervals Phase shift Radial velocity Stars Variable and peculiar stars (including novae)
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