The far-ultraviolet /1180-1950 A/ emission spectrum of Arcturus

Details The far-ultraviolet /1180-1950 A/ emission spectrum of Arcturus The far-ultraviolet /1180-1950 A/ emission spectrum of Arcturus

May 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...205..848m&link_type=abstract

Astrophysical Journal, vol. 205, May 1, 1976, pt. 1, p. 848-854.

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Far Ultraviolet Radiation, Late Stars, Stellar Spectra, Ultraviolet Spectra, Emission Spectra, H Lines, Oxygen Spectra, Rocket Sounding

Scientific paper

The far-ultraviolet (1180-1950 A) emission spectrum of the K2 IIIp star, Arcturus, has been obtained with a rocket-borne multichannel spectrometer. The use of multiple detectors gave an increase in effective observing time and permitted an improvement in spectral resolution over two previous rocket measurements. H I at 1216-A and O I at 1304 A are the only identified emissions, and the observed H I 1216-A flux is low compared with previous observations. A third unidentified feature was observed at 1511 A. The absence of many lines found in emission from the sun is striking. The absence of certain features implies that the coronal temperature must be either below 50,000 K or above 350,000 K.

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