期刊
ASTROPHYSICAL JOURNAL
卷 647, 期 1, 页码 558-563出版社
IOP PUBLISHING LTD
DOI: 10.1086/505295
关键词
stars : individual (nu Indi); stars : oscillations; Sun : helioseismology
Asteroseismology is a powerful method for determining fundamental properties of stars. We report the first application to a metal-poor object, namely the subgiant star nu Ind. We measured precise velocities from two sites, allowing us to detect oscillations and infer a large frequency separation of Delta nu = 24.25 +/- 0: 25 mu Hz. Combining this value with the location of the star in the H-R diagram and comparing with standard evolutionary models, we were able to place constraints on the stellar parameters. In particular, our results indicate that nu Ind has a low mass (0.85 +/- 0.04 M-circle dot) and is at least 9 Gyr old.
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