Brunsden, E. ; Pollard, K. R. ; Wright, D. J. ; De Cat, P. ; Cottrell, P. L.

published in Monthly Notices of the Royal Astronomical Society, 475 issue 3, pp. 3813-3822 (2018)

Abstract: The prototype star for the γ Doradus class of pulsating variables was studied employing photometric and spectroscopic observations to determine the frequencies and modes of pulsation. The four frequencies found are self-consistent between the observation types and almost identical to those found in previous studies (1.3641 d-1, 1.8783 d-1, 1.4742 d-1, and 1.3209 d-1). Three of the frequencies are classified as l, m = (1, 1) pulsations and the other is ambiguous between l, m = (2, 0) and (2, -2) modes. Two frequencies are shown to be stable over 20 yr since their first identification. The agreement in ground-based work makes this star an excellent calibrator between high-precision photometry and spectroscopy with the upcoming TESS observations and a potential standard for continued asteroseismic modelling.

Keyword(s): line: profiles ; techniques: spectroscopic ; stars: oscillations ; stars: variables: general
DOI: 10.1093/mnras/sty034
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