Far-ultraviolet fluorescence of carbon monoxide in the red giant Arcturus

Details Far-ultraviolet fluorescence of carbon monoxide in the red giant Arcturus Far-ultraviolet fluorescence of carbon monoxide in the red giant Arcturus

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248l.137a&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 248, Sept. 15, 1981, p. L137-L140.

Astronomy and Astrophysics

Astrophysics

37

Carbon Monoxide, Far Ultraviolet Radiation, Fluorescence, Red Giant Stars, Stellar Spectra, Ultraviolet Spectra, Carbon, Chromosphere, High Temperature Plasmas, Hydrogen, Iue, Oxygen, Spectral Energy Distribution, Stellar Temperature

Scientific paper

Evidence is presented that many of the weak features observed with International Ultraviolet Explorer (IUE) in the far-ultraviolet (1150-2000 A) spectrum of the archetype red giant Arcturus (K2 III) are A-X fourth positive bands of carbon monoxide excited by chromospheric emissions of O I, C I, and H I. The appearance of fluorescent CO bands near the wavelength of commonly used indicators of high-temperature (T greater than 20,000 K) plasma, such as C II at wavelength 1335 and C IV at wavelength 1548, introduces a serious ambiguity in diagnosing the presence of hot material in the outer atmospheres of the cool giants by means of low-dispersion IUE spectra.

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