Non-Lte Model Atmospheres. VII. The Hydrogen and Helium Spectra of the O Stars

1972 ◽  
Vol 24 ◽  
pp. 193 ◽  
Author(s):  
L. H. Auer ◽  
Dimitri Mihalas
Keyword(s):  
Helium Spectra

scholarly journals Proton and Helium Spectra from the CREAM-III Flight

2017 ◽  
Vol 839 (1) ◽  
pp. 5 ◽  
Author(s):  
Y. S. Yoon ◽  
T. Anderson ◽  
A. Barrau ◽  
N. B. Conklin ◽  
S. Coutu ◽  
...  
Keyword(s):  
Helium Spectra

Hydrogen and Helium Spectra of Gaseous Nebulae

1966 ◽  
Vol 143 ◽  
pp. 722 ◽  
Author(s):  
James B. Kaler
Keyword(s):  
Gaseous Nebulae ◽  
Helium Spectra

Improved Non-LTE Model Atmospheres for Subluminous O-Stars

1988 ◽  
Vol 132 ◽  
pp. 117-122
Author(s):  
U. Heber ◽  
K. Hunger ◽  
T. Rauch ◽  
K. Werner
Keyword(s):  
High Resolution ◽  
New Method ◽  
Balmer Line ◽  
Pure Hydrogen ◽  
Line Profiles ◽  
Stark Broadening ◽  
Echelle Spectrograph ◽  
Helium Spectra ◽  
Model Atom

Improved non-LTE model atmospheres designed for the analysis of very hot subluminous O stars are presented. The calculations are based on the new method of the accelerated lambda iteration (ALI) which proves capable of treating up to 100 levels of various ions. Presented here are improved calculations for (i) pure hydrogen model atmospheres including Stark broadening, (ii) for hydrogen- and helium-composed model atmospheres and (iii) first preliminary models which include in addition a detailed carbon model atom. These models remove an apparent mismatch of Balmer line profiles noted previously and fit high S/N, high-resolution hydrogen and helium spectra obtained with the ESO-Cassegrain echelle spectrograph very well.

scholarly journals The Cosmic‐Ray Proton and Helium Spectra between 0.4 and 200 GV

1999 ◽  
Vol 518 (1) ◽  
pp. 457-472 ◽  
Author(s):  
M. Boezio ◽  
P. Carlson ◽  
T. Francke ◽  
N. Weber ◽  
M. Suffert ◽  
...  
Keyword(s):  
Cosmic Ray ◽  
Helium Spectra

scholarly journals Cosmic-Ray Proton and Helium Spectra above 50 GeV

1972 ◽  
Vol 28 (15) ◽  
pp. 985-988 ◽  
Author(s):  
M. J. Ryan ◽  
J. F. Ormes ◽  
V. K. Balasubrahmanyan
Keyword(s):  
Cosmic Ray ◽  
Helium Spectra

A STUDY OF ADSORBATE VIBRATIONS AT CRYOGENIC TEMPERATURES

1997 ◽  
Vol 04 (06) ◽  
pp. 1365-1370 ◽  
Author(s):  
J. P. CAMPLIN ◽  
S. K. CLOWES ◽  
J. C. COOK ◽  
E. M. Mccash
Keyword(s):  
Infrared Spectroscopy ◽  
Liquid Helium ◽  
Significant Interaction ◽  
Molecular Crystals ◽  
Base Temperature ◽  
Cryogenic Temperatures ◽  
Metal Sample ◽  
Reflection Absorption Infrared Spectroscopy ◽  
Adsorption Of Co ◽  
Helium Spectra

Reflection-absorption infrared spectroscopy (RAIRS) has been used to probe adsorbate vibrations in the temperature range below 77 K (the base temperature obtained in most RAIRS experiments), by cooling the metal sample with liquid helium. Spectra can be recorded routinely at any desired temperature from 23 K to the desorption temperature during any experiment using the apparatus which we have constructed. We report on the adsorption of CO on Pd(100) where CO adopts only bridging sites below 77 K. A significant interaction between the physisorbed and chemisorbed layers is observed using RAIRS. RAIRS spectra of physisorbed CO 2 on Cu(100) are presented and illustrate the potential of the application of RAIRS to the study of growth and phase formation of molecular crystals.

Sign in / Sign up

Export Citation Format

Share Document