Grids of model spectra for WN stars, ready for use
W.-R. Hamann and G. Gräfener
Grids of model atmospheres for Wolf-Rayet stars of the
nitrogen sequence (WN subclass) are presented. The calculations account
for the expansion of the atmosphere, non-LTE, clumping, and line
blanketing from iron-group elements. Observed spectra of
single Galactic WN stars can in general be reproduced consistently by
this generation of models. The parameters of the presented model grids
cover the whole relevant range of stellar temperatures and mass-loss
rates. We point out that there is a degeneracy of parameters for very
thick winds; their spectra tend to depend only on the ratio
$L/{\dot M}^{4/3}$. Abundances of the calculated grids are for Galactic WN stars
without hydrogen and with 20% hydrogen (by mass), respectively. Model
spectra and fluxes are available via internet
(https://www.astro.physik.uni-potsdam.de/PoWR.html).
The full article is available as PostScript file via anonymous ftp.
Server: ftp.astro.physik.uni-potsdam.de
user: anonymous or ftp; Password: your e-mail address;
file: pub/wrhamann/blanket-wn.ps (1.4MB uncompressed) or blanket-wn.ps.gz
(300 kB compressed).
Display full article with ghostview (local users only!)
Fetch PostScript-File (blanket-wn.ps, 1.4 MB, uncompressed)
Fetch PostScript-File (blanket-wn.ps.gz, 300 kB, compressed)