[Alumnos] HOY 13 hs. Seminario Sala IALP- M.Sc. Denny Hoyer

[Secretaría de Ciencia y Técnica]

*Estimados,

Les recordamos que hoy tendremos el siguiente seminario a las 13:00 hs. 
en *la Sala del IALP. *

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Secretaría de Ciencia y Técnica
FCAG*

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***Seminario: *M.Sc. Denny Hoyer **

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Estudiante de doctorado del "Institute for Astronomy and Astrophysics" 
Eberhard Karls University Tübingen.


Título: The giant-dwarf connection.

Resumen: The Asymptotic Giant Branch (AGB) phase is one of the most 
complex and yet not fully understood phase in stellar evolution. 
Spectral analyses of hydrogen-deficient AGB descendants yield 
constraints on nuclearprocesses in that phase -- a pre-requisite to 
understand AGB stellar evolution.The DO-type white dwarf RE 0503-289 was 
discovered in the ROSAT all-sky EUV survey two decades ago. Analyses of 
extreme and far-ultraviolet spectra of RE 0503-289 allowed to identify 
many metal lines up to the trans-iron elements. Thus, RE 0503-289 may be 
a rosetta stone to understand AGB nucleosynthesis and the post-AGB 
stellar evolution. To investigate its uniqueness, we selected three 
stars close to RE 0503-289 in the log T_eff-log g plane. These are the 
PG 1159-type star PG 1707+427 and the two DO-type white dwarfs PG 
0109+111 and WD 0111+002. We present a NLTE spectral analysis and 
discuss their evolution.

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