Volume 547, November 2012
|Number of page(s)||31|
|Section||Catalogs and data|
|Published online||29 October 2012|
A catalogue of Paschen-line profiles in standard stars⋆
Department of AstronomyUniversity of Washington,
2 Visiting Astronomer, Dominion Astrophysical Observatory, Herzberg Institute for Astrophysics, Victoria, B.C., Canada
Received: 12 June 2012
Accepted: 27 August 2012
We have assembled an atlas of line profiles of the Paschen Delta (Pδ) line at 10 049 Å for the use of stellar modelling. For a few stars we have substituted the Paschen Gamma (Pγ) line at 10 938 Å because the Pδ line blends with other features. Most of the targets are standard stars of spectral types from B to M. A few metal-poor stars have been included. For many of the stars we have also observed the Hydrogen Alpha (Hα) line so as to compare the profiles of lines originating from the meta-stable n = 2 level with lines originating from the n = 3 level. The greatest difference in line profile is found for high luminosity and cool stars where the departures from local thermodynamic equilibrium (LTE) in the population of the n = 2 level is expected to be the greatest. For a few stars, sample line profiles have been calculated in the LTE approximation to demonstrate the usefulness of the tabulated and displayed catalogue.
Key words: line: profiles / atlases / stars: early-type / stars: late-type
The reduced observed spectra are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (184.108.40.206) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/547/A62
© ESO, 2012
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