A fresh look at the seismic spectrum of HD49933: analysis of 180 days of CoRoT photometry

  title={A fresh look at the seismic spectrum of HD49933: analysis of 180 days of CoRoT photometry},
  author={O. Benomar and F. Baudin and T. Campante and W. Chaplin and R. Garc'ia and P. Gaulme and T. Toutain and G. Verner and T. Appourchaux and J. Ballot and C. Barban and Y. Elsworth and S. Mathur and B. Mosser and C. R'egulo and I. Roxburgh and M. Auvergne and A. Baglin and C. Catal{\`a} and E. Michel and R. Samadi},
  journal={Astronomy and Astrophysics},
Context. Solar-like oscillations have now been observed in several stars, thanks to ground-based spectroscopic observations and space-borne photometry. CoRoT, which has been in orbit since December 2006, has observed the star HD49933 twice. The oscillation spectrum of this star has proven difficult to interpret. Aims. Thanks to a new timeseries provided by CoRoT, we aim to provide a robust description of the oscillations in HD49933, i.e., to identify the degrees of the observed modes, and to… Expand

Figures and Tables from this paper

HD 46375: seismic and spectropolarimetric analysis of a young Sun hosting a Saturn-like planet
Context. HD 46375 is known to host a Saturn-like exoplanet orbiting at 0.04 AU from its host star. Stellar light reflected by the planet was tentatively identified in the 34-day CoRoT run acquired inExpand
Accurate p-mode measurements of the G0V metal-rich CoRoT target HD 52265
Context. The star HD 52265 is a G0V metal-rich exoplanet-host star observed in the seismology field of the CoRoT space telescope from November 2008 to March 2009. The satellite collected 117 days ofExpand
Seismic analysis of HD 43587Aa, a solar-like oscillator in a multiple system
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 AccuracyExpand
Acoustic spectrum fitting for a large set of solar-like pulsators
Asteroseismology provides the means both to constrain the global properties and to probe the internal structures of stars. Asteroseismic data are now available on large numbers of solar-type stars,Expand
The CoRoT target HD 49933 II. Comparison of theoretical mode amplitudes with observations
Context. The seismic data obtained by CoRoT for the star HD 49933 enable us for the first time to measure directly the amplitudes and linewidths of solar-like oscillations for a star other than theExpand
Red-giant seismic properties analyzed with CoRoT
Context. The CoRoT 5-month long observation runs provide us with the opportunity to analyze a large variety of red-giant stars and derive their fundamental parameters from their asteroseismicExpand
Unveiling stellar magnetic activity using CoRoT seismic observations
It is well known that in the Sun, the frequencies and amplitudes of acoustic modes vary throughout the solar cycle. Indeed, while the magnetic activity goes towards its maximum, the frequencies ofExpand
Current methods for analyzing light curves of solar-like stars
CoRoT has allowed a quantitative leap for the solar-like-star seismology thanks to 5-month-long uninterrupted timeseries of high-precision photometric data. Kepler is also starting to deliver similarExpand
Determining global parameters of the oscillations of solar-like stars
Context. Helioseismology has enabled us to better understand the solar interior, while also allowing us to better constrain solar models. But now is a tremendous epoch for asteroseismology as spaceExpand
Modelling the autocovariance of the power spectrum of a solar‐type oscillator
Asteroseismology is able to conduct studies on the interiors of solar-type stars from the analysis of stellar acoustic spectra. However, such an analysis process often has to rely upon subjectiveExpand


The solar-like oscillations of HD 49933: a Bayesian approach
Context. Asteroseismology has entered a new era with the availability of continuous observations from space-borne missions such as MOST, CoRoT and Kepler. However, the low amplitude and theExpand
Mode width fitting with a simple Bayesian approach - Application to CoRoT targets HD 181420 and HD 49933
Aims. We investigate the asteroseismology of two solar-like targets as observed with the CoRoT satellite, with particular attention paid to the mode fitting. HD 181420 and HD 49933 are typical CoRoTExpand
Seismology and activity of the F type star HD 49933
A 10-night asteroseismic observation programme has been conducted in January 2004 with the spectrometer Harps at the ES0 3.6-m telescope. The selected target, the 6th magnitude F5V star HD 49933, wasExpand
CoRoT sounds the stars: p-mode parameters of Sun-like oscillations on HD 49933
Context. The first asteroseismology results from CoRoT are presented, on a star showing Sun-like oscillations. We have analyzed a 60 day lightcurve of high-quality photometric data collected by CoRoTExpand
Short-lived spots in solar-like stars as observed by CoRoT
Context. CoRoT light curves have an unprecedented photometric quality, having simultaneously a high signal-to-noise ratio, a long time span and a nearly continuous duty-cycle. Aims. We analyse theExpand
Improved fundamental parameters and LTE abundances of the CoRoT solar-type pulsator HD 49933
Aims. The knowledge of accurate stellar parameters is a key stone in several fields of stellar astrophysics, such as asteroseismology and stellar evolution. Although the parameters can be derivedExpand
Accurate fundamental parameters of CoRoT asteroseismic targets - The solar-like stars HD 49933, HD 175726, HD 181420, and HD 181906
Context. The CoRoT satellite has provided high-quality light curves of several solar-like stars. Analysis of these light curves provides oscillation frequencies that make it possible to probe theExpand
A spectroscopic study of southern (candidate) gamma Doradus stars. II. Detailed abundance analysis and fundamental parameters
Context. The γ Doradus stars are a recent class of variable main sequence F-type stars located on the red edge of the Cepheid instability strip. They pulsate in gravity modes, and this makes themExpand
On the detection of Lorentzian profiles in a power spectrum: a Bayesian approach using ignorance priors
Aims. Deriving accurate frequencies, amplitudes, and mode lifetimes from stochastically driven pulsation is challenging, more so, if one demands that realistic error estimates be given for all modelExpand
Excitation of solar-like oscillations across the HR diagram
Aims. We extend semi-analytical computations of excitation rates for solar oscillation modes to those of other solar-like oscillating stars to compare them with recent observations Methods. NumericalExpand