20 citations · 43 across the 10 of their papers we have counts for
10 papers
Thermodynamical properties of stellar matter: II. Internal energy, temperature and density exponents and specific heats for stellar interiors
W. Stolzmann, T. Bloecker
Starting from the Helmholtz free energy we calculate analytically first- and second-order derivatives, as internal energy and specific heats, for the ideal system and the exchange…
The dynamical evolution of the fragmented, bipolar dust shell around the carbon star IRC +10216: Rapid changes of a PPN-like structure?
R. Osterbart, Y. Balega, T. Bloecker +2
We present high-resolution J-, H-, and K-band observations and the first H-K color image of the carbon star IRC +10216. The images were reconstructed from 6m telescope speckle inte…
The evolution of helium white dwarfs: III. On the ages of millisecond pulsar systems
D. Schoenberner, T. Driebe, T. Bloecker
We employed recently computed evolutionary white-dwarf models with helium cores, supplemented by heavier models with carbon-oxygen cores, in order to investigate the ages of millis…
The dynamical evolution of the dust shell of IRC+10216
R. Osterbart, Y. Balega, T. Bloecker +2
We present high-resolution J-, H-, and K-band observations of the carbon star IRC+10216. The images were reconstructed from 6 m telescope speckle interferograms using the bispectru…
On the formation of hydrogen-deficient post-AGB stars
F. Herwig, T. Bloecker, N. Langer +1
We present an evolutionary sequence of a low mass star from the Asymptotic Giant Branch (AGB) through its post-AGB stage, during which its surface chemical composition changes from…
Kinematics of the anemic cluster galaxy NGC 4548 - Is stripping still active ?
B. Vollmer, V. Cayatte, A. Boselli +2
We present new HI (20" resolution) and CO observations of NGC 4548, an anemic galaxy in the Virgo cluster. The atomic gas distribution shows a ring structure which is distorted at…
The rapidly evolving hypergiant IRC+10420: High-resolution bispectrum speckle-interferometry and dust-shell modelling
T. Bloecker, Y. Balega, K. -H. Hofmann +3
The hypergiant IRC+10420 is a unique object for the study of stellar evolution since it is the only object that is believed to be witnessed in its rapid transition from the red sup…
The role of convective boundaries
F. Herwig, T. Bloecker, D. Schoenberner
We investigate the influence of convective overshoot on stellar evolution models of the thermal pulse AGB phase with M_ZAMS = 3 Msol. An exponential diffusive overshoot algorithm i…
On the validity of the core-mass luminosity relation for TP-AGB stars with efficient dredge-up
F. Herwig, D. Schoenberner, T. Bloecker
We investigate the validity of the core mass - luminosity relation (CMLR), originally described by Paczynski (1970), for asymptotic giant branch stars under the presence of third d…
Diffraction-limited 76 mas Speckle Masking Observations of the Core of NGC 1068 with the SAO 6m Telescope
M. Wittkowski, Y. Balega, T. Beckert +3
We present the first K-band bispectrum speckle interferometry of NGC 1068 with an angular resolution of 76 mas (~5.5pc). This angular resolution allows us to attribute the measured…