Alpha Trianguli Australis (K2 II-III) - Hybrid or composite?

Details Alpha Trianguli Australis (K2 II-III) - Hybrid or composite? Alpha Trianguli Australis (K2 II-III) - Hybrid or composite?

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...291l...7a&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 291, April 1, 1985, p. L7-L10.

Astronomy and Astrophysics

Astronomy

12

Chromosphere, Late Stars, Ultraviolet Astronomy, F Stars, Far Ultraviolet Radiation, Spectral Energy Distribution, Supergiant Stars

Scientific paper

The prototype "hybrid-spectrum" giant, α Trianguli Australis, exhibits a far-ultraviolet continuum which is considerably bluer than would be expected of a star of its optical colors, suggesting the presence of a previously unrecognized companion. If the K type primary is as luminous as indicated by the widths of its Ca II and Hα lines, the companion could be an early F type dwarf that only recently has arrived on the main sequence. Indeed, the flux of C IV from α TrA - an important measure of "hybridness" - would not be inconsistent with that expected from a very young, chromospherically active F star.

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