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

Abstract

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.

accpted for publication in ApJ

Cited by in corpus (21)

• Asteroseismology of solar-type stars
• Asteroseismology and Interferometry
• The amplitude of solar oscillations using stellar techniques
• Age dating of an early Milky Way merger via asteroseismology of the naked-eye star $\nu$ Indi
• Solar-like oscillations in the G8 V star tau Ceti
• Precise radial velocities of giant stars. IV. A correlation between surface gravity and radial velocity variation and a statistical investigation of companion properties
• Benchmark stars for Gaia: fundamental properties of the Population II star HD140283 from interferometric, spectroscopic and photometric data
• The Impact of Stellar Oscillations on Doppler Velocity Planet Searches
• Asteroseismology of 36 \emph{Kepler} subgiants -- I. Oscillation frequencies, linewidths and amplitudes
• Solar-like oscillations in the metal-poor subgiant nu Indi: II. Acoustic spectrum and mode lifetime
• The Discovery of Stellar Oscillations in the Planet Hosting Giant Star Beta Geminorum
• Solar-like oscillations in a metal-poor globular cluster with the HST
• Asteroseismology across the HR diagram
• Bayesian Inference from Observations of Solar-Like Oscillations
• Age-dating the young open cluster UBC 1 with g-mode asteroseismology, gyrochronology, and isochrone fitting
• A search for solar-like oscillations in K giants in the globular cluster M4
• Nearby stars as gravitational wave detectors
• Luminaries in the Sky: The TESS Legacy Sample of Bright Stars. I. Asteroseismic detections in naked-eye main-sequence and sub-giant solar-like oscillators
• Spectroscopic and Interferometric Measurements of Nine K Giant Stars
• Early Results from APOKASC
• Applications of Bayesian Probability Theory in Astrophysics