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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2004

The pre-main-sequence star HD34282: a very short-period delta Scuti-type pulsator

Résumé

HD34282 has been found to pulsate during a systematic search for short-term photometric variability in Herbig Ae/Be stars with the goal of determining the position and size of the pre-main-sequence instability strip. Simultaneous Strömgren photometry is used in the frequency analysis, yielding two frequencies with values of nu1= 79.5 and nu2= 71.3 cycle d-1. The light curve with the largest amplitude is that of the u band. This behaviour, which is not common for delta Scuti stars, is explained as pulsation in a high radial order in stars near the blue edge of the instability strip. The main period, with a value of 18.12 min, represents the shortest period observed so far for a delta Scuti-type pulsator. A seismic modelling, including instability predictions and rotation effects, has been attempted. It is found that both main-sequence and pre-main-sequence models predict modes in the range of 56 to 82 cycle d-1 (between 648 and 949 muHz), corresponding to oscillations of radial order n from 6 to 8. The highest of the observed frequencies only becomes unstable for models of low metallicity, in agreement with results from spectroscopic measurements.
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Dates et versions

hal-03742841 , version 1 (23-02-2023)

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Pedro J. Amado, Andrés Moya, Juan Carlos Suárez, Susana Martin-Ruiz, Rafael Garrido, et al.. The pre-main-sequence star HD34282: a very short-period delta Scuti-type pulsator. Monthly Notices of the Royal Astronomical Society, 2004, 352, pp.L11-L15. ⟨10.1111/j.1365-2966.2004.08116.x⟩. ⟨hal-03742841⟩
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