He I 10830 Å emission from alpha Bootis and alpha 1Herculis.
Abstract
The He I 10830 A line has been detected in emission in the spectra of Alpha Boo and Alpha-1 Her, two stars for which evidence of a high-temperature chromosphere has heretofore been lacking. The 10830 A emission from Alpha Boo is variable on a time scale of 1 week. He I 10830 A emission from Alpha-1 Her, a star surrounded by an extensive circumstellar gas and dust shell, is surprising. It is proposed that the emission may result from a shock front created when high-velocity infalling gas meets the photosphere.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- April 1979
- DOI:
- 10.1086/182925
- Bibcode:
- 1979ApJ...229L..33O
- Keywords:
-
- Chromosphere;
- Emission Spectra;
- Helium;
- Infrared Spectra;
- Late Stars;
- Metallic Stars;
- Giant Stars;
- Radiative Transfer;
- Stellar Envelopes;
- Astrophysics;
- Chromospheres:Late-Type Stars;
- Emission Lines:Late-Type Stars;
- Helium:Late-Type Stars;
- Infrared Spectra:Late-Type Stars