Frequency and mode identification of γ Doradus from photometric and spectroscopic observations*. Issue 3 (9th January 2018)

• Record Type: Journal Article
• Authors: Brunsden, E; Pollard, K R; Wright, D J; De Cat, P; Cottrell, P L
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 475:Issue 3(2018)
• Page Start: 3813
• Page End: 3822
• Publication Date: 2018-01-09
• Subjects: line: profiles -- techniques: spectroscopic -- stars: oscillations -- stars: variables: general; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/sty034
• Languages: English
• ISSNs: 0035-8711

Abstract

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.