Solar-like oscillations in the metal-poor subgiant nu Indi: constraining the mass and age using asteroseismology

Details Solar-like oscillations in the metal-poor subgiant nu Indi: constraining the mass and age using asteroseismology Solar-like oscillations in the metal-poor subgiant nu Indi: constraining the mass and age using asteroseismology

2006-04-21

arxiv.org/abs/astro-ph/0604453v1

Astrophys.J.647:558-563,2006

Astronomy and Astrophysics

Astrophysics

accpted for publication in ApJ

Scientific paper

10.1086/505295

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 microHz. 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_sun) and is at least 9 Gyr old.

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