Abstract
Abstract We have computed a grid of theoretical models to fit the 12 oscillation modes of HIP 80088 observed by K2. HIP 80088 is determined to be a pre-main-sequence star, in which the CN cycle has not arrived at the equilibrium state. Mass fractions of C12 and N14 in metal composition are and , respectively, indicating that 28% of C12 have turned into N14. Meanwhile, our fitting results show that physical parameters of HIP 80088 converge to a small range: M = 1.68–1.78 M ⊙, Z = 0.015–0.018, km s−1, log g = 4.114–4.125, R = 1.882–1.914 R ⊙, τ 0 = 7636–7723 s, and age = 9.03–10.21 Myr. Based on our model fittings, f 3 is suggested to be one radial mode, f 2, f 4, f 8, and f 11 to be four ℓ = 1 modes, and f 1, f 5, f 6, f 7, f 9, f 10, and f 12 to be seven ℓ = 2 modes. In particular, we find that (f 2, f 4, f 8) form one complete triplet with the averaged frequency spacing of 16.045 μHz, and (f 5, f 7, f 9, f 10) form four components of one quintuplet with the averaged frequency spacing of 13.388 μHz. The two averaged frequency spacings are not equal. Based on the best-fitting model, those ℓ = 2 modes of HIP 80088 are found to be mixed modes, which are p-dominated modes with pronounced g-mode features, while oscillation modes with ℓ = 1 are p modes.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
