2001A&A...374.1056A


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.25CET10:12:43

2001A&A...374.1056A - Astronomy and Astrophysics, volume 374, 1056-1070 (2001/8-2)

V1162 Ori: A multiperiodic δ Scuti star with variable period and amplitude.

ARENTOFT T., STERKEN C., HANDLER G., FREYHAMMER L.M., BRUCH A., NIARCHOS P., GAZEAS K., MANIMANIS V., VAN CAUTEREN P., PORETTI E., DAWSON D.W., LIU Z.L., ZHOU A.Y., DU B.T., SHOBBROOK R.R., GARRIDO R., FRIED R., AKAN M.C., IBANOGLU C., EVREN S., TAS G., JOHNSON D., BLAKE C. and KURTZ D.W.

Abstract (from CDS):

We present the results of multisite observations of the δ 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 (1-3mmag). 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 (f5) suffers from uncertainty due to aliasing. Using colour photometry we find evidence for a radial main frequency (f1), 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 282d 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.

Abstract Copyright:

Journal keyword(s): stars: variables: δ Scuti - stars: individual: V1162 Orionis - techniques: photometric - methods: data analysis

VizieR on-line data: <Available at CDS (J/A+A/374/1056): table4a.dat table4b.dat>

CDS comments: GSC 4478-0019 is a misprint for GSC 4778-0019.

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* V1162 Ori dS* 05 32 01.9917190902 -07 15 24.659936685   10.3 9.9     ~ 45 0
2 TYC 4778-19-1 * 05 32 06.8489975460 -07 17 51.881063801   11.4 10.0     ~ 4 0
3 GSC 04778-00025 * 05 32 13.5629169822 -07 18 12.638245399           ~ 1 0
4 V* XX Pyx dS* 08 58 39.0320174189 -24 35 10.585991007           A4V 81 0

    Equat.    Gal    SGal    Ecl

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2020.10.25-10:12:43

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