Author pages are created from data sourced from our academic publisher partnerships and public sources.
- Publications
- Influence
Atmospheric parameters of field subdwarf B stars
- R. Saffer, P. Bergeron, D. Koester, J. Liebert
- Physics
- 1 September 1994
High signal-to-noise ratio optical spectrophotometry of a sample of field subluminous B stars drawn largely from the Palomar Green ultraviolet-excess survey is analyzed with a new grid of model… Expand
White dwarf mass distribution in the SDSS
- S. O. Kepler, S. Kleinman, +5 authors L. Althaus
- Physics
- 11 December 2006
We determined masses for the 7167 DA and 507 DB white dwarf stars classified as single and non-magnetic in Data Release 4 of the Sloan Digital Sky Survey (SDSS). We obtained revised T eff and log g… Expand
Accretion and diffusion in white dwarfs - New diffusion timescales and applications to GD 362 and G 29-38
- D. Koester
- Physics
- 9 March 2009
Context. A number of cool white dwarfs with metal traces, of spectral types DAZ, DBZ, and DZ have been found to exhibit infrared excess radiation due to circumstellar dust. The origin of this dust is… Expand
Metal Lines in DA White Dwarfs
- B. Zuckerman, D. Koester, I. Reid, M. Hünsch
- Physics
- 10 October 2003
We report Keck telescope HIRES echelle observations of DA white dwarfs in a continuation of an extensive search for metals. These spectra are supplemented with new JHK magnitudes that are used to… Expand
The Temperature Scale and Mass Distribution of Hot DA White Dwarfs
- D. Finley, D. Koester, G. Basri
- Physics
- 10 October 1997
Results are presented from a comprehensive spectroscopic survey of DA white dwarfs hotter than ~25,000 K. The observations consisted of CCD spectra with signal-to-noise ratios of ~100 in the blue,… Expand
New white dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 12
- S. O. Kepler, I. Pelisoli, +7 authors L. A. Amaral
- Physics
- 28 October 2015
White dwarfs carry information on the structure and evolution of the Galaxy, especially through their luminosity function and initial-to-final mass relation. Very cool white dwarfs provide insight… Expand
A radio-pulsing white dwarf binary star
- T. Marsh, B. Gaensicke, +23 authors P. Wheatley
- Physics, Medicine
- Nature
- 27 July 2016
White dwarfs are compact stars, similar in size to Earth but approximately 200,000 times more massive. Isolated white dwarfs emit most of their power from ultraviolet to near-infrared wavelengths,… Expand
The accretion-diffusion scenario for metals in cool white dwarfs
- D. Koester, D. Wilken
- Physics
- 8 March 2006
We calculated diffusion timescales for Ca, Mg, Fe in hydrogen atmosphere white dwarfs with temperatures between 5000 and 25 000 K. With these timescales we determined accretion rates for a sample of… Expand
A Catalog of Spectroscopically Identified White Dwarf Stars in the First Data Release of the Sloan Digital Sky Survey
- S. Kleinman, H. Harris, +23 authors D. G. York
- Physics
- 10 February 2004
We present the full spectroscopic white dwarf and hot subdwarf sample from the Sloan Digital Sky Survey (SDSS) first data release, DR1. We find 2551 white dwarf stars of various types, 240 hot… Expand
New white dwarf stars in the Sloan Digital Sky Survey Data Release 10
- S. O. Kepler, I. Pelisoli, +11 authors A. Rebassa-Mansergas
- Physics
- 15 November 2014
We report the discovery of 9 089 new spectroscopically confirmed white dwarfs and subdwarfs in the Sloan Digital Sky Survey Data Release 10. We obtain Teff, log g and mass for hydrogen atmosphere… Expand