Uncertainties on central mixing in main-sequence (MS) and core He-burning (He-B) phases affect key predictions of stellar evolution such as late evolutionary phases, chemical enrichment, ages, etc. These data have been made available in the Stellar Seismic Indices database (). In total, MLEUP yields seismic indices for 20,122 red giant stars and granulation parameters for 17,109 of them. Finally, we applied MLEUP to CoRoT and Kepler data. These simulations allowed us to determine, calibrate and propose correction for the biases on the parameter estimates as well as on the error estimates produced with MLEUP. Its performances have been tested on Monte Carlo simulations for observation conditions representative of CoRoT and Kepler data.
![red giant download not working red giant download not working](https://i.ytimg.com/vi/gpkwtvWJiT8/maxresdefault.jpg)
This method, called MLEUP, takes advantage of the Maximum Likelihood Estimate (MLE) algorithm combined with the parametrized representation of red giant pulsation spectra following the Universal Pattern (UP). We have developed a new automated method intended to perform the simultaneous - and thus more consistent - measurement of both the seismic indices characterizing the oscillations and the parameters characterizing the granulation signature of red-giant stars. Then, in the perspective of Gaia, we discuss about the possibility to derive other seismic quantities like e.g. In this paper, we focus on the main results for both seismic indices Δv and vmax as well as for the stellar parameters (mass, radius and luminosity) seismically inferred. In total, we yield seismic indices and granulation parameters for about 5,000 stars for CoRoT and more than 13,000 for Kepler. Then we applied it to all stars observed by CoRoT and all long-cadence Kepler lightcurves. This method has been tested in terms of precision and accuracy, using Monte Carlo simulations. For this purpose, we have developed the method MLEUP able to extract simultaneously the seismic indices (the equidistance Δv, the frequency vmax and the height Henv of the maximum oscillation power) and granulation parameters (the e-folding time τeff and the variance of the integrated brightness fluctuations σ2). In the framework of the SPACEInn project, a Stellar Seismic Indices (SSI - ) database was developed in order to provide the scientific community with oscillations and granulation signatures for a large set of red-giant type stars.