恒星物理研究组知识库

Based on regularities in rotational splitting, we seek possible multiplets for the observed frequencies of CoRoT 102749568. There are 21 sets of multiplets identified, including four sets of multiplets with l = 1, nine sets of multiplets with l = 2, and eight sets of multiplets with l = 3. In particular, there are three complete triplets (f(10), f(12), f(14)), (f(31), f(34), f(35)), and (f(41), f(43), f(44)). The rotational period of CoRoT 102749568 is estimated to be 1.34(-0.05)(+0.04) days. When doing model fittings, three l = 1 modes (f(12,) f(34), and f(43)) and the radial first overtone f(13) are used. Our results shows that the three nonradial modes (f(12), f(34), and f(43)) are mixed modes, which mainly provide constraints on the helium core. The radial first overtone f(13) mainly provides constraint on the stellar envelope. Hence the size of the helium core of CoRoT 102749568 is determined to be M-Pi e = 0.148 +/- 0.003 M-circle dot and R-Pi e = 0.0581 +/- 0.0007 R-circle dot. The fundamental parameters of CoRoT 102749568 are determined to be M = 1.54 +/- 0.03 M-circle dot, Z=0.006, f(ov) = 0.004 +/- 0.002, log g = 3.696 +/- 0.003, T-eff = 6886 +/- 70 K, R = 2.916 +/- 0.039 R-circle dot, and L = 17.12 +/- 1.13 L-circle dot.