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20 papers · 2 filters
Post Common Envelope Binaries from SDSS. V: Four eclipsing white dwarf main sequence binaries
S. Pyrzas, B. T. Gänsicke, T. R. Marsh +7
We identify SDSS011009.09+132616.1, SDSS030308.35+005444.1, SDSS143547.87+373338.5 and SDSS154846.00+405728.8 as four eclipsing white dwarf plus main sequence (WDMS) binaries from…
SDSS White Dwarf mass distribution at low effective temperatures
D. Koester, S. O. Kepler, S. J. Kleinman +1
The DA white dwarfs in the Sloan Digital Sky Survey, as analyzed in the papers for Data Releases 1 and 4, show an increase in surface gravity towards lower effective temperatures b…
White Dwarf Spectra and Atmosphere Models
Detlev Koester
We describe the spectral classification of white dwarfs and some of the physical processes important for their understanding. In the major part of this paper we discuss the input p…
Simultaneous NIR/sub-mm observation of flare emission from SgrA*
A. Eckart, R. Schoedel, M. Garcia-Marin +28
We report on a successful, simultaneous observation and modeling of the sub-millimeter to near-infrared flare emission of the Sgr A* counterpart associated with the super-massive b…
Probing The Lower Mass Limit for Supernova Progenitors and the High-Mass End of the Initial-Final Mass Relation from White Dwarfs in the Open Cluster M35 (NGC 2168)
Kurtis A. Williams, Michael Bolte, Detlev Koester
We present a photometric and spectroscopic study of the white dwarf population of the populous, intermediate-age open cluster M35 (NGC 2168); this study expands upon our previous s…
The effect of stellar feedback on the formation and evolution of gas and dust tori in AGN
M. Schartmann, K. Meisenheimer, H. Klahr +3
Recently, the existence of geometrically thick dust structures in Active Galactic Nuclei (AGN) has been directly proven with the help of mid-infrared interferometry. The observatio…