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TU Berlin

2000

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Dynamical Model Calculations of AGB Star Winds Including Time Dependent Dust Formation and Non-LTE Radiative Cooling

V. Schirrmacher, P. Woitke, and E. Sedlmayr

Astronomische Gesellschaft Abstract Series, Vol. 17., (2000)

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Circumstellar Dust Shells of pulsating Red Giants as Dynamical Systems

S. Meier, A.B.C. Patzer, M. Lüttke, P. Woitke and E. Sedlmayr

Astronomische Gesellschaft Abstract Series, Vol. 17., (2000)

Abstract:

Miras and long-period variables (LPVs) are highly evolved, pulsating stars on the Asymptotic Giant Branch (AGB) with massive outflows and prominent circumstellar dust shells (CDSs). A CDS, driven by the stellar pulsation, can be considered as a dynamical system which reveals various kinds of complex phenomena like spatio-temporal instabilities, bifurcations, multiperiodicity and transition to chaos.

Electronic structure investigation of neutral titanium oxide molecules Ti_xO_y

K.S. Jeong, C. Chang, E. Sedlmayr and D. Sülzle

Journal of Physics B, 33, 3417-3430 (2000)

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Abstract:

Electronic and structural properties of energetically low-lying isomers of isolated TixOy (x=1-6, y=1-12) molecular systems have been investigated by density functional theoretical methods. A variety of stationary points is thoroughly characterised. We report total cluster energies, equilibrium geometries, and harmonic vibrational wave numbers.

Dust Formation in Brown Dwarfs

M. Lüttke, Ch. Helling, M. John, K.S. Jeong, P. Woitke, and E. Sedlmayr

Astronomische Gesellschaft Abstract Series, Vol. 17., (2000)

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Abstract:

Brown Dwarfs provide favorable conditions for the gas-solid phase transition since in its atmosphere low temperatures with high densities are combined. Observations of unexpectedly weak molecular absorption bands indicate the existence of dust in their atmospheres.

Circumstellar dust shells around oxygen--rich long-period variable stars

K.S. Jeong, E. Sedlmayr, and J.M. Winters

Astronomische Gesellschaft Abstract Series, Vol. 17., (2000)

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Abstract:

Influence of the Metal Abundances on the Dust-driven Winds of LPVs

Ch. Helling, T.U. Arndt and E. Sedlmayr

Astronomische Gesellschaft Abstract Series, Vol. 17., (2000)

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Abstract:

The variability of emission lines in shocked M Mira atmospheres

He. Richter, P. Woitke and E. Sedlmayr and P.R. Wood

Astronomische Gesellschaft Abstract Series, Vol. 17., (2000)

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Abstract:

A systematic investigation of the mass loss mechanism in dust forming long--period variable stars

J.M. Winters, T. Le Bertre, K.S. Jeong, Ch. Helling, E. Sedlmayr

Astronomy & Astrophysics, 361, 641-659 (2000)

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Table 2, Gzipped PostScript version (28 kB)

Abstract:

Dust shells around oxygen-rich Miras and long-period variables

K.S. Jeong

Dissertation, Institut für Astronomie & Astrophysik, TU Berlin (2000)

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