Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010raa....10.1265b&link_type=abstract
Research in Astronomy and Astrophysics, Volume 10, Issue 12, pp. 1265-1274 (2010).
Astronomy and Astrophysics
Astrophysics
Scientific paper
We test the possible evolutionary tracks of stars with various masses (1.8 Modot, 1.9 Modot, 2.0 Modot, 2.1 Modot, 2.2 Modot) and metallicities Z (0.008, 0.010, 0.012), including both models with and without convective core overshooting. At a given mass and metallicity, the models with a larger overshoot predict a larger radius and age of the star. Based on the observed frequency of oscillations and the position of e Oph on the H-R diagram, we obtain two distinct better-fitting models: the solutions with mass M = 1.9 Modot favor a radius in the range 10.55 ± 0.03 Rodot with an age of 1.01 ± 0.08 Gyr; the solutions with mass M = 2.0 Modot favor a radius in the range 10.74 ± 0.03 Rodot with an age of 0.95 ± 0.11 Gyr. Furthermore, we investigate the influence of overshooting on the internal structure and the pulsation properties, and find that increasing the convective core overshoot significantly decreases non-radial mode inertia, while also increasing the mode amplitude. Therefore, the estimation of stellar mass and age might be modified by convective core penetration.
Bi Shao-Lan
Gai Ning
Li Ling-Huai
Tang Yan-Ke
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