High-resolution optical observations of CA II K in Deneb and Aldebaran

Details High-resolution optical observations of CA II K in Deneb and Aldebaran High-resolution optical observations of CA II K in Deneb and Aldebaran

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...218..205m&link_type=abstract

Astrophysical Journal, Part 1, vol. 218, Nov. 15, 1977, p. 205-208.

Astronomy and Astrophysics

Astrophysics

4

Emission Spectra, K Lines, Stellar Envelopes, Supergiant Stars, Chromosphere, High Resolution, Late Stars, Optical Emission Spectroscopy

Scientific paper

High-spectral-resolution echellograms confirm the existence of an asymmetric emission core in the K line of Deneb that may be due to chromospheric emission from this A-type supergiant or that may be due to scattering from a circumstellar shell. If the core is due to chromospheric emission, its width does not agree with what is predicted using the Wilson-Bappu relation for late-type stars. This would indicate that the chromospheres of hotter stars are qualitatively different from those of cooler stars. A K-emission-core profile for Aldebaran is also presented.

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