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SwSt 1: an O-rich planetary nebula around a C-rich central star
O. De Marco, P. A. Crowther, M. J. Barlow +2
The hydrogen-deficient carbon-rich [WCL] type central star HD167362 and its oxygen-rich planetary nebula (PN) SwSt~1 are investigated. The nebular chemistry might indicate a recent…
Mass-loss predictions for O and B stars as a function of metallicity
Jorick S. Vink, Alex de Koter, Henny J. G. L. M. Lamers
We have calculated a grid of massive star wind models and mass-loss rates for a wide range of metal abundances between 1/100 and 10 Z/Zsun. The calculation of this grid completes t…
Crystallinity versus mass-loss rate in Asymptotic Giant Branch stars
F. Kemper, L. B. F. M. Waters, A. de Koter +1
Infrared Space Observatory (ISO) observations have shown that O-rich Asymptotic Giant Branch (AGB) stars exhibit crystalline silicate features in their spectra only if their mass-l…