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    V 1162 Ori: A multiperiodic delta Scuti star with variable period and amplitude
    (Edp Sciences S A, 2001) Arentoft, T; Sterken, C; Handler, G; Freyhammer, LM; Bruch, A; Niarchos, P; Gazeas, K; Manimanis, V; Van Cauteren, P; Poretti, E; Dawson, DW; Liu, ZL; Zhou, AY; Du, BT; Shobbrock, RR; Garrido, R; Fried, R; Akan, MC; Ibanoglu, C; Evren, S; Tas, G; Johnson, D; Blake, C; Kurtz, DW
    We present the results of multisite observations of the delta Scuti star V1162 Ori. The observations were done in the period October 1999 - May 2000, when 18 telescopes at 15 observatories were used to collect 253 light extrema during a total of 290 hours of time-series observations. The purpose of the observations was to investigate amplitude and period variability previously observed in this star, and to search for low-amplitude frequencies. We detect, apart from the main frequency and its two first harmonics, four additional frequencies in the light curves, all with low amplitudes (1-3 mmag). Combining the present data set with data obtained in 1998-99 at ESO confirms the new frequencies and reveals the probable presence of yet another pulsational frequency. All five low-amplitude frequencies are statistically significant in the data, but at least one of them (f(5)) suffers from uncertainty due to aliasing. Using colour photometry we find evidence for a radial main frequency (f(1)), while most or all low-amplitude frequencies are likely non-radial. We show that the main frequency of V1162 Ori has variable amplitude and period/phase, the latter is also displayed in the O-C diagram from light extrema. The amplitude variability in our data is cyclic with a period of 282 d and a range of nearly 20 mmag, but earlier amplitude values quoted in the literature cannot be explained by this cyclic variation. O-C analysis including data from the literature show that the period of V1162 Ori displays a linear period change as well as sudden or cyclic variations on a time scale similar to that of the amplitude variations.