Solar-like oscillations in the G9.5 subgiant beta Aquilae

Abstract

An interesting asteroseismic target is the G9.5 IV solar-like star beta Aql. This is an ideal target for asteroseismic investigations, because precise astrometric measurements are available from Hipparcos that greatly help in constraining the theoretical interpretation of the results. The star was observed during six nights in August 2009 by means of the high-resolution échelle spectrograph SARG operating with the TNG 3.58 m Italian telescope on the Canary Islands, exploiting the iodine cell technique. We present the result and the detailed analysis of high-precision radial velocity measurements, where the possibility of detecting time individual p-mode frequencies for the first and deriving their corresponding asymptotic values will be discussed. The time-series analysis carried out from \sim 800 collected spectra shows the typical p-mode frequency pattern with a maximum centered at 416 \muHz. In the frequency range 300 - 600 \muHz we identified for the first time six high S/N (\gtrsim 3.5) modes with l = 0,2 and 11 < n < 16 and three possible candidates for mixed modes (l = 1), although the p-mode identification for this type of star appears to be quite difficult owing to a substantial presence of avoided crossings. The large frequency separation and the surface term from the set of identified modes by means of the asymptotic relation were derived for the first time. Their values are Δν= 29.56 \pm 0.10 \muHz and ε= 1.29 \pm 0.04, consistent with expectations. The most likely value for the small separation is δν_{02} = 2.55 \pm 0.71 \muHz.

8 pages, 8 figures, 3 tables, accepted by A&A

References in corpus (8)

• Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Southern Sample
• Ensemble Asteroseismology of Solar-Type Stars with the NASA Kepler Mission
• The amplitude of solar oscillations using stellar techniques
• Automatic Determination of Stellar Parameters via Asteroseismology of Stochastically Oscillating Stars: Comparison with Direct Measurements
• Solar-like oscillations in KIC11395018 and KIC11234888 from 8 months of Kepler data
• Detection of solar-like oscillations in the G5 subgiant mu-Herculis
• Solar-like oscillations in the metal-poor subgiant nu Indi: II. Acoustic spectrum and mode lifetime
• Seismology of Procyon A: determination of mode frequencies, amplitudes, lifetimes, and granulation noise

Cited by in corpus (22)

• DIAMONDS: a new Bayesian Nested Sampling tool. Application to Peak Bagging of solar-like oscillations
• First Results From The Hertzsprung Song Telescope: Asteroseismology Of The G5 Subgiant Star {\Mu}Her
• A Bayesian approach to scaling relations for amplitudes of solar-like oscillations in Kepler stars
• The TESS-Keck Survey I: A Warm Sub-Saturn-mass Planet and a Caution about Stray Light in TESS Cameras
• Doppler Constraints on Planetary Companions to Nearby Sun-like Stars: An Archival Radial Velocity Survey of Southern Targets for Proposed NASA Direct Imaging Missions
• Beyond the Main Sequence: Testing the accuracy of stellar masses predicted by the PARSEC evolutionary tracks
• A PCA approach to stellar effective temperatures
• NPOI Measurements of Ten Stellar Oscillators
• Detection of solar-like oscillations in the bright red giant stars $\gamma$ Psc and ${\theta }^1$ Tau from a 190-day high-precision spectroscopic multisite campaign
• Deciphering stellar chorus: apollinaire, a Python 3 module for Bayesian peakbagging in helio- and asteroseismology
• Oscillations in the Sun with SONG: Setting the scale for asteroseismic investigations
• First detection of oscillations in the Halo giant HD 122563: validation of seismic scaling relations and new fundamental parameters
• No swan song for Sun-as-a-star helioseismology: performances of the Solar-SONG prototype for individual mode characterisation
• The mass and age of the first SONG target: the red giant 46 LMi
• Fundamental stellar parameters of benchmark stars from CHARA interferometry -- III. Giant and subgiant stars
• Benefits of multiple sites for asteroseismic detections
• Acoustic oscillations and dynamo action in the G8 sub-giant EK Eri
• Doppler imaging and differential rotation of ${\sigma }^2$ Coronae Borealis using SONG
• Solar-like oscillations in $\gamma$ Cephei A as seen through SONG and TESS
• Asteroseismology of the G8 subgiant beta Aquilae with SONG-Tenerife, SONG-Australia and TESS
• Magnetic activities on two single-lined RS Canum Venaticorum binaries IM Pegasi and $\sigma$ Geminorum
• Pyodine: An open, flexible reduction software for iodine-calibrated precise radial velocities