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HD 151839


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A search for rapid oscillations in chemically peculiar A-type stars
In 1995 we initiated a Northern Hemisphere survey for rapidlyoscillating Ap stars. This paper presents the results including one newroAp star (HD 122970), the confirmation of rapid oscillations of HD99563 and apparent null results for other stars. Using Hipparcos data astatistical analysis of the absolute magnitudes and galacticdistributions of all known roAp and noAp stars (also taken from theliterature) was made. A systematic trend for most of the program starsin a M_{ V} vs. beta (index of the Strömgren uvbybeta system)diagram was detected leading to the conclusion that beta issystematically influenced by the chemical peculiarity and/or magneticfield. Three roAp stars are outside the delta Scuti instability stripwhich implies that the driving mechanism of the two classes of pulsatingstar is different. This is also suggested by new pulsation models. Nostatistical difference between the galactic distribution of roAp andnoAp stars was found.

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Datos observacionales y astrométricos

Constelación:Hércules
Ascensión Recta:16h49m38.42s
Declinación:+07°57'31.7"
Magnitud Aparente:9.398
Movimiento Propio en Ascensión Recta:-25.7
Movimiento Propio en Declinación:36.6
B-T magnitude:9.943
V-T magnitude:9.443

Catálogos y designaciones:
Nombres Propios   (Edit)
HD 1989HD 151839
TYCHO-2 2000TYC 962-792-1
USNO-A2.0USNO-A2 0975-08593013

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