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- Publications
- Influence
Metal traces in white dwarfs of the SPY (ESO Supernova Ia Progenitor Survey) sample
- D. Koester, K. Rollenhagen, +5 authors D. Reimers
- Physics
- 1 March 2005
We search for faint Ca II lines in the spectra of about 800 apparently single white dwarfs observed at high resolution for the SPY (ESO Supernova Progenitor Survey) survey. Photospheric Ca is… Expand
HS 0146+1847 : a DAZB white dwarf of very unusual composition
- D. Koester, R. Napiwotzki, R. Napiwotzki, B. Voss, D. Homeier, D. Reimers
- Physics
- 1 August 2005
HS 0146+1847, originally identified as a white dwarf candidate in proper motion surveys, was rediscovered as a candidate in the Hamburg Quasar Survey. Spectra obtained for the SPY (ESO Supernova la… Expand
ANCIENT PLANETARY SYSTEMS ARE ORBITING A LARGE FRACTION OF WHITE DWARF STARS
- B. Zuckerman, C. Melis, B. Klein, D. Koester, M. Jura
- Physics
- 14 July 2010
Infrared studies have revealed debris likely related to planet formation in orbit around ~30% of youthful, intermediate mass, main-sequence stars. We present evidence, based on atmospheric pollution… Expand
DA white dwarfs in Sloan Digital Sky Survey Data Release 7 and a search for infrared excess emission
- J. Girven, B. Gaensicke, D. Steeghs, D. Koester
- Physics
- 21 October 2011
We present a method which uses colour–colour cuts on the Sloan Digital Sky Survey (SDSS) photometry to select white dwarfs with hydrogen-rich (DA) atmospheres without the recourse to spectroscopy.… Expand
The Chemical Composition of an Extrasolar Minor Planet
- B. Zuckerman, D. Koester, C. Melis, B. Hansen, M. J. Ucla, U. Kiel
- Physics
- 1 August 2007
We report the relative abundances of 17 elements in the atmosphere of the white dwarf star GD 362, material that, very probably, was contained previously in a large asteroid or asteroids with… Expand
A METAL-RICH LOW-GRAVITY COMPANION TO A MASSIVE MILLISECOND PULSAR
- D. Kaplan, V. Bhalerao, +8 authors University of Texas-San Antonio
- Physics
- 11 February 2013
Most millisecond pulsars with low-mass companions are in systems with either helium-core white dwarfs or non-degenerate ("black widow" or "redback") stars. A candidate counterpart to PSR J1816+4510… Expand
CHEMICAL ABUNDANCES IN THE EXTERNALLY POLLUTED WHITE DWARF GD 40: EVIDENCE OF A ROCKY EXTRASOLAR MINOR PLANET
- B. Klein, M. Jura, D. Koester, B. Zuckerman, C. Melis
- Physics
- 8 December 2009
We present Keck/High Resolution Echelle Spectrometer data with model atmosphere analysis of the helium-dominated polluted white dwarf GD 40, in which we measure atmospheric abundances relative to… Expand
Thirty-Five New Pulsating Da White Dwarf Stars
- A. Mukadam, F. Mullally, +16 authors J. Brinkmann
- Physics
- 1 June 2004
We present 35 new pulsating DA (hydrogen atmosphere) white dwarf stars discovered from the Sloan Digital Sky Survey (SDSS) and the Hamburg Quasar Survey (HQS). We have acquired high-speed time series… Expand
A precision study of two eclipsing white dwarf plus M dwarf binaries
- S. Parsons, T. Marsh, +16 authors C. Tappert
- Physics, Computer Science
- 24 November 2011
TLDR
The stellar content of the hamburg/eso survey. I. automated selection of da white dwarfs
- N. Christlieb, L. Wisotzki, D. Reimers, D. Homeier, D. Koester, U. Heber
- Physics
- 24 November 2000
We describe automatic procedures for the selection of DA white dwarfs in the Hamburg/ESO objective-prism survey (HES). For this purpose, and the selection of other stellar objects (e.g., metal-poor… Expand