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X-ray analysis of the colliding wind binary FO15
Albacete Colombo, J. F.
We combine and analyze ten XMM-Newton X-ray observations of the FO15 hot massive (O5V((f))+O9.5V) binary system. EPIC spectra are fitted according to a warm absorption model N(ism)x N(wind) in combination with a two temperature (APEC) optically thin thermal plasma model of temperatures kT(1)=0.22 and kT(2)=2.62 keV, and the inclusion of six indepe…
Analysis of stellar activity of F, G and K stars with IUE
Buccino, A. P.; Mauas, P. J. D.
In this work, we correct in colour (B-V) the calibration between the Mount Wilson (S_MW) and the Mg II index (X_hk) we have presented in previous works. With this calibration, we build a catalog of the Mg II and Ca II indexes for all the F, G and K main sequence stars with high resolution IUE spectra (i.e. 1640 observations of 269 stars). Finally,…
Abundancias químicas y estado de evolución de estrellas tipo B y A
Adelman, S. J.; Pintado, O.; Pedrosa, S.
Three stars of B (Alpha Tel and HR1781) and A (Tau7 Eri) type have been studied in order to determine their evolutionary state and the presence of chemical peculiarities. For this study we used spectra with high signal-to-noise ratios, obtained with the EBASIM spectrograph at CASLEO. The efective temperature, surface gravity, rotational velocity a…
Nebular abundances in southern symbiotic stars
Luna, G. J. M.; Costa, R. D. D.
We have calculated relative elemental abundances for a sample of 43 symbiotic stars. Helium abundances and the relative elemental abundances N/O, Ne/O were derived from new spectra collected in the optical range through low dispersion spectroscopy and from IUE low resolution spectra (SWP camera). The He ionic abundances were derived taking into ac…