Epsilon Indi Ba, Bb: a detailed study of the nearest known brown dwarfs (2009)
King, Robert R., McCaughrean, Mark J., Homeier, Derek, Allard, France, Scholz, Ralf-Dieter, Lodieu, Nicolas
The discovery of epsilon Indi Ba, Bb, a binary brown dwarf system very close to the Sun, makes possible a concerted campaign to characterise the physical parameters of two T dwarfs. Recent...
Spectral analysis of 636 white dwarf - M star binaries from the Sloan Digital Sky Survey (2008)
Heller, René, Homeier, Derek, Dreizler, Stefan, Stensen, Roy \O
We present a catalog of 857 white dwarf (WD)-M binaries from the sixth data release (DR6) of the Sloan Digital Sky Survey (SDSS), most of which were previously identified. For 636 of them, we...
Epsilon Indi Ba, Bb: a spectroscopic study of the nearest known brown dwarfs (2008)
King, Robert R., McCaughrean, Mark J., Homeier, Derek, Allard, France, Scholz, Ralf-Dieter, Lodieu, Nicolas
The discovery of Epsilon Indi Ba and Bb, a nearby binary brown dwarf system with a main-sequence companion, allows a concerted campaign to characterise the physical parameters of two T dwarfs...
CFBDS J005910.90-011401.3: reaching the T-Y Brown Dwarf transition? (2008)
Delorme, Philippe, Delfosse, Xavier, Albert, Loic, Artigau, Etienne., Forveille, Thierry, Reylé, Céline, ...
We report the discovery of CFBDS J005910.90-011401.3 (hereafter CFBDS0059), the coolest brown dwarf identified to date. We found CFBDS0059 using i' and z' images from the Canada-France-Hawaii...
CFBDS J005910.90-011401.3: reaching the T-Y Brown Dwarf transition? (2008)
Delorme, Philippe, Delfosse, Xavier, Albert, Loic, Artigau, Etienne., Forveille, Thierry, Reylé, Céline, ...
We report the discovery of CFBDS J005910.90-011401.3 (hereafter CFBDS0059), the coolest brown dwarf identified to date. We found CFBDS0059 using i' and z' images from the Canada-France-Hawaii...
CFBDS J005910.90-011401.3: reaching the T-Y Brown Dwarf transition? (2008)
Delorme, Philippe, Delfosse, Xavier, Albert, Loic, Artigau, Etienne., Forveille, Thierry, Reylé, Céline, ...
We report the discovery of CFBDS J005910.90-011401.3 (hereafter CFBDS0059), the coolest brown dwarf identified to date. We found CFBDS0059 using i' and z' images from the Canada-France-Hawaii...
CFBDS J005910.90-011401.3: reaching the T-Y Brown Dwarf transition? (2008)
Delorme, Philippe, Delfosse, Xavier, Albert, Loic, Artigau, Etienne., Forveille, Thierry, Reylé, Céline, ...
We report the discovery of CFBDS J005910.90-011401.3 (hereafter CFBDS0059), the coolest brown dwarf identified to date. We found CFBDS0059 using i' and z' images from the Canada-France-Hawaii...
CFBDS J005910.90-011401.3: reaching the T-Y Brown Dwarf transition? (2008)
Delorme, Philippe, Delfosse, Xavier, Albert, Loic, Artigau, Etienne., Forveille, Thierry, Reylé, Céline, ...
We report the discovery of CFBDS J005910.90-011401.3 (hereafter CFBDS0059), the coolest brown dwarf identified to date. We found CFBDS0059 using i' and z' images from the Canada-France-Hawaii...
K-H_2 Quasi-molecular absorption detected in the T-dwarf epsilon Indi Ba (2007)
Allard, France, Allard, Nicole F., Homeier, Derek, Kielkopf, John, McCaughrean, Mark J., Spiegelman, Fernand
T-type dwarfs present a broad and shallow absorption feature centred around 6950 A in the blue wing of the K doublet at 0.77 micron which resembles in depth and shape the satellite absorption...
Alkali Line Profiles in Ultracool White Dwarfs (2007)
Homeier, Derek, Allard, Nicole F., Johnas, Christine M. S., Hauschildt, Peter H., Allard, France
We present PHOENIX atmosphere models for metal-rich cool white dwarfs using improved line shapes for the Na I and K I resonance doublets. Profiles for collisional broadening due to H2 and He based on...
Alkali Line Profiles in Degenerate Dwarfs (2007)
Homeier, Derek, Allard, Nicole F., Allard, France
Ultracool stellar atmospheres show absorption by alkali resonance lines severely broadened by collisions with neutral perturbers. In the coolest and densest atmospheres, such as those of T dwarfs, Na...
Modelling Alkali Line Absorption and Molecular Bands in Cool DAZs (2005)
Homeier, Derek, Allard, Nicole F., Allard, France, Hauschildt, Peter H., Schweitzer, Andreas, Stancil, Phillip C., ...
Two peculiar stars showing an apparent extremely broadened and strong NaI D absorption have been discovered in surveys for cool white dwarfs by Oppenheimer et al. (2001) and Harris et al. (SDSS,...
Phase-Resolved Infrared H- and K-band Spectroscopy of EF Eridani (2004)
Harrison, Thomas E., Howell, Steve B., Szkody, Paula, Homeier, Derek, Johnson, Joni J., Osborne, Heather L.
We present new phase-resolved H and K-band spectroscopy of the ultra-short period magnetic cataclysmic variable EF Eri in its current, prolonged ``low'' state obtained using NIRI on Gemini-North, and...
Spectral Properties of Brown Dwarfs and Hot Jupiters (2004)
Homeier, Derek, Allard, France, Hauschildt, Peter H., Barman, Travis S., Schweitzer, Andreas, Baron, Edward A.
Brown dwarfs bridge the gap between the stellar and planetary mass regimes. Evolving from conditions very similar to the lowest-mass stars, the atmospheres of older brown dwarfs closely resemble...
Peculiar abundances in cv secondary stars: revising their Evolutionary history? (2004)
Derek Homeier, Heather L. Osborne, Joni J. Johnson, Steve B. Howell, Thomas E. Harrison
Methane and the Spectra of T Dwarfs (2002)
Homeier, Derek, Hauschildt, Peter H., Allard, France
We have updated our PHOENIX model atmospheres and theoretical spectra for ultracool dwarfs with new opacity data for methane based on line strength predictions with the STDS software. By extending...
Automatisierte Klassifikation stellarer Spektren im Hamburger Quasar-Survey / (2001)
Kiel, Universiẗat, Diss., 2001.