A Study of the Equivalent Width of Helium Lines in Early-Type Stars.
Abstract
The theoretical strengths of the He i lines in the diffuse 2p-nd series have been employed, together with E. G. Wiffiams' measures of equivalent widths, to construct curves of growth for the helium lines in fifty-seven 0- and B-type stars. Comparisons of these curves with a theoretical curve for helium atoms at a temperature of 20,0000 per- mits a determination of the quantifies V and ~. V is defined by the relatio
- Publication:
-
The Astrophysical Journal
- Pub Date:
- June 1939
- DOI:
- 10.1086/144087
- Bibcode:
- 1939ApJ....89..623G