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A new period determination for the close PG1159 binary SDSSJ212531.92-010745.9
S. Schuh, I. Traulsen, T. Nagel +6
Methods to measure masses of PG1159 stars in order to test evolutionary scenarios are currently based on spectroscopic masses or asteroseismological mass determinations. One recent…
K-H_2 Quasi-molecular absorption detected in the T-dwarf epsilon Indi Ba
France Allard, Nicole F. Allard, Derek Homeier +3
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…
Alkali Line Profiles in Ultracool White Dwarfs
Derek Homeier, Nicole F. Allard, Christine M. S. Johnas +2
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…
Alkali Line Profiles in Degenerate Dwarfs
Derek Homeier, Nicole F. Allard, France Allard
Ultracool stellar atmospheres show absorption by alkali resonance lines severely broadened by collisions with neutral perturbers. In the coolest and densest atmospheres, such as th…
A high resolution spectral atlas of brown dwarfs
A. Reiners, D. Homeier, P. H. Hauschildt +1
We present a UVES/VLT high resolution atlas of three L dwarfs and one T dwarf system, spectral classes at which most of the objects are brown dwarfs. Our atlas covers the optical r…
Six New ZZ Ceti Stars from the SPY and the HQS Surveys
B. Voss, D. Koester, R. Østensen +3
We report on the discovery of six new ZZ Ceti stars. They were selected as candidates based on preparatory photometric observations of objects from the Hamburg Quasar Survey (HQS),…