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- W4328142020 abstract "ABSTRACT Several studies have shown that a number of stars pulsating in p modes lie between the β Cep and δ Sct instability strips in the Hertzsprung–Russell (HR) Diagram. At present, there is no certain understanding of how p modes can be excited in this Teff range. The goal of this work is to disprove the conjecture that all stars pulsating in p modes and lying in this Teff range are the result of incorrect measurements of Teff, contamination, or the presence of unseen cooler companions lying in the δ Sct instability strip (given the high binary fraction of stars in this region of the HR Diagram). Using TESS data, we show that the A0Vnne star HD 42477 has a single p mode coupled to several r modes and/or g modes. We rule out a contaminating background star with a pixel-by-pixel examination, and we essentially rule out the possibility of a companion δ Sct star in a binary. We model the pulsations in HD 42477, and suggest that the g modes are excited by overstable convective core modes. We also conjecture that the single p mode is driven by coupling with the g modes, or that the oblateness of this rapidly-rotating star permits driving by He ii ionization in the equatorial region." @default.
- W4328142020 created "2023-03-22" @default.
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- W4328142020 date "2023-03-21" @default.
- W4328142020 modified "2023-10-17" @default.
- W4328142020 title "HD 42477: coupled r modes, g modes, and a p mode in an A0Vnne star" @default.
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- W4328142020 doi "https://doi.org/10.1093/mnras/stad858" @default.
- W4328142020 hasPublicationYear "2023" @default.
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