Browsing by Author "van Wyk, F"

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    Inhomogeneities in molecular layers of Mira atmospheres
    (2011) Wittkowski, M; Boboltz, D A; Ireland, M; Karovicova, I; Ohnaka, K; Scholz, M; van Wyk, F; Whitelock, P; Wood, P R; Zijlstra, A A
    Aims. We investigate the structure and shape of the photospheric and molecular layers of the atmospheres of four Mira variables.
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    The Spitzer spectroscopic survey of S-type stars
    (2012) Smolders, K; Neyskens, P; Blommaert, J A D L; Hony, S; Van Winckel, H; Decin, L; Van Eck, S; Sloan, G C; Cami, J; Uttenthaler, S; Degroote, P; Barry, D; Feast, M; Groenewegen, M A T; Matsuura, M; Menzies, J; Sahai, R; van Loon, J Th; Zijlstra, A A; Acke, B; Bloemen, S; Cox, N; de Cat, P; Desmet, M; Exter, K; Ladjal, D; Østensen, R; Saesen, S; van Wyk, F; Verhoelst, T; Zima, W
    Context. S-type AGB stars are thought to be in the transitional phase between M-type and C-type AGB stars. Because the composition of the circumstellar environment reflects the photospheric abundances, one may expect a strong influence of the stellar C/O ratio on the molecular chemistry and the mineralogy of the circumstellar dust.