The chromosphere of the A7V star alpha (Aql)+

Details The chromosphere of the A7V star alpha (Aql)+ The chromosphere of the A7V star alpha (Aql)+

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980esasp.157...63b&link_type=abstract

The second European International Ultraviolet Explorer (IUE) Conference, held 26-28 March 1980 in Tübingen, West Germany. Edited

Astronomy and Astrophysics

Astronomy

20

A Stars, Chromosphere, Iue, Stellar Atmospheres, Ultraviolet Astronomy, Absorption Spectra, Emission Spectra, Ions, Lyman Alpha Radiation, Magnesium, Silicon, Stellar Rotation

Scientific paper

High resolution spectrograms of alpha Aql (A7V) obtained with the International Ultraviolet Explorer (IUE) satellite in the short and long wavelength regions were taken. Evidence of chromospheric emission in the h and k lines of Mg II was found. The width delta lambda approximately equals 1.4 A fits very closely the linear relationship between the absolute visual magnitude and Mg II emission width. Hydrogen L alpha emission was detected and a flux of 5.58 + or - 1.0 x 100,000 ERG/sq cm sec at the stellar surface was estimated.

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