Notes on disentangling of spectra II. Intrinsic line-profile variability due to Cepheid pulsations - Astrophysics > Solar and Stellar AstrophysicsReportar como inadecuado




Notes on disentangling of spectra II. Intrinsic line-profile variability due to Cepheid pulsations - Astrophysics > Solar and Stellar Astrophysics - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: The determination of pulsation velocities from observed spectra of Cepheidsis needed for the Baade-Wesselink calibration of these primary distancemarkers. The applicability of the Fourier-disentangling technique for thedetermination of pulsation velocities of Cepheids and other pulsating stars isstudied. The KOREL-code was modified to enable fitting of free parameters of aprescribed line-profile broadening function corresponding to the radialpulsations of the stellar atmosphere. It was applied to spectra of delta Cep inthe H-alpha region observed with the Ondrejov 2-m telescope. The telluric lineswere removed using template-constrained disentangling, phase-locked variationsof line-strengths were measured and the curves of pulsational velocitiesobtained for several spectral lines. It is shown that the amplitude and phaseof the velocities and line-strength variations depend on the depth of lineformation and the excitation potential. The disentangling of pulsations in theCepheid spectra may be used for distance determination.



Autor: P. Hadrava, M. Slechta, P. Skoda

Fuente: https://arxiv.org/



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