High-dispersion observations of alpha Bootis (K1 III) with the International Ultraviolet Explorer

Details High-dispersion observations of alpha Bootis (K1 III) with the International Ultraviolet Explorer High-dispersion observations of alpha Bootis (K1 III) with the International Ultraviolet Explorer

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...311..947a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 311, Dec. 15, 1986, p. 947-959. SERC-supported research.

Astronomy and Astrophysics

Astronomy

29

K Stars, Main Sequence Stars, Red Giant Stars, Spaceborne Astronomy, Stellar Evolution, Stellar Spectra, Ultraviolet Spectra, Abundance, Emission Spectra, Iue, Spectral Energy Distribution, Stellar Luminosity

Scientific paper

The authors have obtained very deeply exposed IUE echelle spectrograms of the bright, early-K giant Arcturus. They did not detect significant flux in the most prominent high-excitation species of a solar-like transition zone, C IV λ1548.2. The presence of a weak feature of Si III] λ1892.0, and possibly also Si IV λ1393.8, indicates the existence of a small amount of plasma at temperatures as hot as 6×104K. Measurements of C II] multiplet UV0.01 near 2325 Å provide a lower limit of about 5×109cm-3 for the electron density in the chromospheric layers. C II UV1 (1335 Å) emission is very weak. These results confirm that the "coronal" activity of the old red giants is considerably diminished from that of even the "quietest" of their main-sequence predecessors, stars like the Sun.

Affiliated with

Also associated with

No associations

Rating

High-dispersion observations of alpha Bootis (K1 III) with the International Ultraviolet Explorer does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with High-dispersion observations of alpha Bootis (K1 III) with the International Ultraviolet Explorer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High-dispersion observations of alpha Bootis (K1 III) with the International Ultraviolet Explorer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1121595