Seismic analysis of HD43587Aa, a solar-like oscillator in a multiple system

Abstract

Context. The object HD 43587Aa is a G0V star observed during the 145-day LRa03 run of the COnvection, ROtation and planetary Transits space mission (CoRoT), for which complementary High Accuracy Radial velocity Planet Searcher (HARPS) spectra with S/N>300 were also obtained. Its visual magnitude is 5.71, and its effective temperature is close to 5950 K. It has a known companion in a highly eccentric orbit and is also coupled with two more distant companions. Aims. We undertake a preliminary investigation of the internal structure of HD 43587Aa. Methods. We carried out a seismic analysis of the star, using maximum likelihood estimators and Markov Chain Monte Carlo methods. Results. We established the first table of the eigenmode frequencies, widths, and heights for HD 43587Aa. The star appears to have a mass and a radius slightly larger than the Sun, and is slightly older (5.6 Gyr). Two scenarios are suggested for the geometry of the star: either its inclination angle is very low, or the rotation velocity of the star is very low. Conclusions. A more detailed study of the rotation and of the magnetic and chromospheric activity for this star is needed, and will be the subject of a further study. New high resolution spectrometric observations should be performed for at least several months in duration.

References in corpus (15)

• Basic physical parameters of a selected sample of evolved stars
• Correcting stellar oscillation frequencies for near-surface effects
• CESAM: a free code for stellar evolution calculations
• Asteroseismology of the solar analogs 16 Cyg A & B from Kepler observations
• Calibrations of Atmospheric Parameters Obtained from the First Year of SDSS-III APOGEE Observations
• The Liege Oscillation Code
• Observational Evidence for Tidal Interaction in Close Binary Systems
• Accurate p-mode measurements of the G0V metal-rich CoRoT target HD 52265
• High Precision Abundances of the Old Solar Twin HIP 102152: Insights on Li Depletion from the Oldest Sun
• KIC 8410637: a 408-day period eclipsing binary containing a pulsating red giant
• Solar-like oscillations with low amplitude in the CoRoT target HD 181906
• Asteroseismic surface gravity for evolved stars
• Masses of Astrometrically-Discovered and Imaged Binaries: G 78-28AB and GJ 231.1BC
• HD 46375: seismic and spectropolarimetric analysis of a young Sun hosting a Saturn-like planet
• Bayesian Inference from Observations of Solar-Like Oscillations

Cited by in corpus (10)

• Asteroseismology of solar-type stars
• Improving transit characterisation with Gaussian process modelling of stellar variability
• The Age and Interior Rotation of Stars from Asteroseismology
• Fundamental properties of Kepler and CoRoT targets: III. Tuning scaling relations using the first adiabatic exponent
• How accurate are stellar ages based on stellar models? II. The impact of asteroseismology
• Convective boundary mixing in low- and intermediate-mass stars I. Core properties from pressure-mode asteroseismology
• Fundamental properties of Kepler and CoRoT targets -- IV. Masses and radii from frequencies of minimum $\Delta \nu$ and their implications
• 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
• Modeling of two CoRoT solar analogues constrained by seismic and spectroscopic analysis
• Is the primary CoRoT target HD43587 under a Maunder minimum phase?