### The 9-AURIGAE System

The F0 V star 9 Aur A exhibits an irregular variability of amplitude $\approx$0.1 magnitude at optical wavelengths. The variations are too slow for it to be a $\delta$ Scuti-type star. There is no evidence for a close, interacting companion or ring of dust, either from infrared, ultraviolet, or spe...

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Journal Title: Monthly Notices of the Royal Astronomical Society Vol. 263; no. 3; pp. 781 - 788 Edward Guinan, K. Krisciunas, K. D. Luedeke, C. Aspin, T. R. Geballe, H. Akazawa, C. F. Claver, H. J. Landis, N. Ohkura, D. R. Skillman, O. Ohshima Article Aug 1993 Full Text
Summary: The F0 V star 9 Aur A exhibits an irregular variability of amplitude $\approx$0.1 magnitude at optical wavelengths. The variations are too slow for it to be a $\delta$ Scuti-type star. There is no evidence for a close, interacting companion or ring of dust, either from infrared, ultraviolet, or speckle data. The photometric variability of 9 Aur A is similar to two other early F dwarf stars: $\gamma$ Doradus and HD 96008. 9 Aur B appears to be an M dwarf, 9 Aur C is an early- to mid-K dwarf star, and 9 Aur E, if it is a member of the system, probably is a normal white dwarf. 9 Aur D is most likely an unrelated and distant K giant. [See note added in press regarding a fourth member of this class of variables without a cause", and short term variations of the radial velocity of 9 Aur.] 0035-8711