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| Paper: |
Hα/Pδ Lines of Hydrogen in Cool Luminous Stars |
| Volume: |
448, 16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun |
| Page: |
893 |
| Authors: |
Huang, W.; Wallerstein, G. |
| Abstract: |
We have been assembling Hα/Pδ (P for Paschen) line profiles for a wide range
of spectral types. The lines are at 6563 and 10049 Å. The data have been obtained with
the Coude spectrograph of the 1.2-m telescope of the Dominion Astrophysical Observatory
(DAO). In this presentation we concentrate on stars of type F, G, K, and M. The advantage
of using Pδ to verify models of stellar atmosphere is that departures from LTE
are mainly due to the meta-stability of the 2s level. Stars of high luminosity illustrate
the differences between LTE and NLTE since collisional effects are reduced as compared with
main sequence stars. Profile difference between the Pδ and Hα lines and the
synthesized LTE line profiles are shown. |
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