Bulletin de la Société Royale des Sciences de Liège, 2018
The automated method of full spectrum fitting gives reliable estimates of stellar atmospheric par... more The automated method of full spectrum fitting gives reliable estimates of stellar atmospheric parameters (Teff, log g and [Fe/H]) for late A, F, G, and early K type stars. Recently, the technique was further improved in the cooler regime and the validity range was extended up to a spectral type of M6 - M7 (Teff 2900 K). The present study aims to explore the application of this method on the low-resolution spectra of Am stars, a class of chemically peculiar stars, to examine its robustness for these objects. We use ULySS with the Medium-resolution INT Library of Empirical Spectra (MILES) V2 spectral interpolator for parameter determination. The determined Teff and log g values are found to be in good agreement with those obtained from high-resolution spectroscopy.
ABSTRACT Full spectrum fitting is known as a reliable method to deter-mine the atmospheric parame... more ABSTRACT Full spectrum fitting is known as a reliable method to deter-mine the atmospheric parameters of FGK stars, but its accuracy decreases for either OBA or M stars. We are considering here a method where an observed spectrum is compared to an empirical library of stars with known parameters. Our goal are to quantify the biases on the measurements of the cool stars when using the MILES interpolator published in Prugniel et al. (2011), and to improve these measurements. We generate a new version of the interpolator based on updated atmospheric parameters of MILES stars. The comparison with the literature shows that with this new version, the biases are considerably reduced. The mean bias of the T eff with repect to literature is of the order of −2 K. The mean biases on log g and [Fe/H] are respectively −0.01 and −0.04 dex. The new version of the interpolator is available as a FITS file and the updated table of the adopted parameters for MILES stars is available in electronic form upon request to the author.
as evidenced by the antiangiogenic potency of IL-18 that have shown effective alone and more effe... more as evidenced by the antiangiogenic potency of IL-18 that have shown effective alone and more effective when used with VEGF therapy.
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Papers by kaushal sharma