He I 10830 A emission from Alpha Bootis and Alpha-1 Herculis

Details He I 10830 A emission from Alpha Bootis and Alpha-1 Herculis He I 10830 A emission from Alpha Bootis and Alpha-1 Herculis

Apr 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...229l..33o&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 229, Apr. 1, 1979, p. L33-L37.

Astronomy and Astrophysics

Astrophysics

15

Chromosphere, Emission Spectra, Helium, Infrared Spectra, Late Stars, Metallic Stars, Giant Stars, Radiative Transfer, Stellar Envelopes

Scientific paper

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.

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