Frequency and mode identification of γ Doradus from photometric and spectroscopic observations*
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.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- April 2018
- DOI:
- 10.1093/mnras/sty034
- arXiv:
- arXiv:1803.06890
- Bibcode:
- 2018MNRAS.475.3813B
- Keywords:
-
- line: profiles;
- techniques: spectroscopic;
- stars: oscillations;
- stars: variables: general;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- Accepted for Publication in Monthly Notices of the Royal Astronomical Society, Volume 475, Issue 3, p.3813-3822