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Topics at the DRS Late stages stellar evolution White dwarfs

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Presentation on theme: "Topics at the DRS Late stages stellar evolution White dwarfs"— Presentation transcript:

1 Topics at the DRS Late stages stellar evolution White dwarfs
Hot massive stars & extragalactic stellar astronomy Binaries with massive companions X-ray astronomy, neutron stars, black holes & AGN

2 Late stages of stellar evolution
Chemical composition Late stages of stellar evolution Kinematics, Hypervelocity stars Heiko Hirsch pulsations SN Ia progenitors White dwarf rotation Uli Heber Alfred Tillich Stephan Geier Christian Schmitt

3 Hot massive stars & extragalactic stellar astronomy
NLTE model atmospheres Galactic abundance gradients Chemical composition Norbert Przybilla BA Supergiants Markus Firnstein Fernanda Nieva Florian Schiller

4 White dwarfs Magnetic fields Diffusion Klaus Unglaub Irmela Bues

5 Binaries with massive components
Large Magellanic cloud Light curves Horst Drechsel Stefan Nesslinger

6 Neutron stars, black holes & AGN
Cygnus X-1 Jörn Wilms Manfred Hanke

7 Observations Optical spectroscopy: ESO, Calar Alto, Keck
UV spectroscopy: HST & FUSE X-ray: XMM, Chandra, Suzaku, RXTE γ-ray: INTEGRAL Imaging & Astrometry Future: eRosita, SIMBOL-X

8 Education - Physics undergraduates (1. year) - Physics graduates
Lecture courses for - Physics undergraduates (1. year) - Physics graduates - student teachers - non-physics graduates (mostly computer science) Lab course (Praktikum): 60 students/year Numerics course

9 Plate Archive from Bamberg: 1921 – 1960 more than 12000 plates
photographic monitoring (Felderplan with Sonneberg & Potsdam) from Bamberg: 1921 – 1960 Boyden-station (South Africa): more than plates plate scanning since 2003 collaboration with Tsvetkov et al. (Bulgarian Academy of Sciences)

10 Public Outreach and public lectures: 700-2000 people/year
Public observations, guided tours, slide shows and public lectures: people/year

11 Collaborations

12 Komponenten der Galaxis
Dark matter Very old stars Old stars Young & old stars Buser

13 Quantitative Spektralanalyse Komplexe Modelatome: Schwere Elemente

14 DETAIL SURFACE Flux  Input Model Atom Atmospheric Parameters
Levels: *Excitation Potentials *Statistical Weights *Ionization States Transitions: *Oscillator Strength *Photoionization cross sections *Excitation and Ionization cross sections Atmospheric Parameters Teff, logg, [M/H] * f line components * Statistical Weights   col and  rad    Abundance Model Atmosphere DETAIL Statistical Equilibrium & Radiative Transference S= S(ni) Rij = Rij(J) SURFACE Line profiles of the atom Iteration until Si = Si-1 Voigt profile Output DETAIL Input SURFACE Occupation numbers ni for each  Flux

15 Elementhäufigkeiten Heiße Sterne: Ultravioletspektroskopie: HST

16 Elementhäufigkeiten:
- Unterhäufigkeiten leichter Elemente Überhäufigkeiten schwerer Elemente im Vergleich zur Sonne

17 Asteroseismologie Nichtradiale Pulsationen

18 Hyper-velocity star Definition:
- Raumgeschwindigkeit übersteigt lokale Entweichgeschwindigkeit Stern ist nicht mehr an Galaxis gebunden - Entweichgeschwindigkeit von der Galaxis: ca. 500km/s

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