On the close companion to alpha Ursae Majoris.
Abstract
After our recent article on the chromospheric emission features of the Mg ii resonance doublet near 2800 A observed in a UMa, Bidelman pointed out to us that this star's close companion is considerably brighter than is stated in the Yale Catalogue of Bright Stars. We have synthesized the Mg ii features for this star from the Mg ii observations obtained in other single stars. The results show that the close companion to a UMa is late A in type, in general agreement with the spectroscopic studies. This explains the apparent discrepancy in the Mg ii doublet emission strengths between a UMa and p Gem. Key words: stellar spectra - emission lines - spectrophotometry - ultraviolet observations
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- April 1977
- DOI:
- 10.1086/130095
- Bibcode:
- 1977PASP...89..163K
- Keywords:
-
- Emission Lines:Visual Binaries;
- Late-Type Giants:Spectrophotometry