Asteroseismic study of the red giant epsilon Ophiuchi

作者：Bi, Shao-Lan^*; Li, Ling-Huai; Tang, Yan-Ke; Gai, Ning

来源：Research in Astronomy and Astrophysics, 2010, 10(12): 1265-1274.

DOI：10.1088/1674-4527/10/12/007

• stars oscillations
• stars individual epsilon Ophiuchi
• stars interiors

We test the possible evolutionary tracks of stars with various masses (1 8M(O), 1 9 M-O, 2 0 M-O, 2 1 M-O, 2 2M(O)) and metallicities Z (0008, 0010, 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 epsilon Oph on the H-R diagram, we obtain two distinct better-fitting models the solutions with mass M = 1 9 M-O favor a radius in the range 10 55 +/- 0 03 R-O with an age of 1 01 +/- 0 08 Gyr, the solutions with mass M = 2 0 M-O favor a radius in the range 10 74 +/- 0 03 R-O 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

• 出版日期2010-12
• 单位北京师范大学; 德州学院