@article{3080522,
    title = "V 1162 Ori: A multiperiodic delta Scuti star with variable period and
amplitude",
    author = "Arentoft, T and Sterken, C and Handler, G and Freyhammer, LM and Bruch, and A and Niarchos, P and Gazeas, K and Manimanis, V and Van Cauteren, P and and Poretti, E and Dawson, DW and Liu, ZL and Zhou, AY and Du, BT and and Shobbrock, RR and Garrido, R and Fried, R and Akan, MC and Ibanoglu, C and and Evren, S and Tas, G and Johnson, D and Blake, C and Kurtz, DW",
    journal = "Chinese Astronomy and Astrophysics",
    year = "2001",
    volume = "374",
    number = "3",
    pages = "1056-1070",
    publisher = "EDP SCIENCES S A",
    issn = "0275-1062",
    doi = "10.1051/0004-6361:20010794",
    keywords = "stars : variables : delta Scuti; stars : individual : V 1162 Orionis;
techniques : photometric; methods : data analysis",
    abstract = "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."
}