V 1162 Ori: A multiperiodic delta Scuti star with variable period and amplitude


Arentoft T., Sterken C., Handler G., Freyhammer L., Bruch A., Niarchos P., ...More

ASTRONOMY & ASTROPHYSICS, vol.374, no.3, pp.1056-1070, 2001 (Journal Indexed in SCI) identifier

  • Publication Type: Article / Article
  • Volume: 374 Issue: 3
  • Publication Date: 2001
  • Doi Number: 10.1021/0004-6361:20010794
  • Title of Journal : ASTRONOMY & ASTROPHYSICS
  • Page Numbers: pp.1056-1070

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.