A cool giant with a circumstellar cloud

Details A cool giant with a circumstellar cloud A cool giant with a circumstellar cloud

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.176...61g&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 176, no. 1, Feb. 1991, p. 61-68. Research supported by National Astronomy

Astronomy and Astrophysics

Astrophysics

1

Emission Spectra, Giant Stars, Stellar Envelopes, Stellar Spectra, Absorption Spectra, Fine Structure, G Stars, Magnesium, Ultraviolet Spectra

Scientific paper

The IUE spectrum of the star HD 139521, a giant of class G8III is obtained and based on the analysis of the narrow structure of 2795 (k) and 2803 (h) Mg II emission profiles, the existence of a circumstellar cloud around the giant star is assumed. This conclusion is confirmed also by the anomaly of the small observed power of the doublet Mg II emission at 2800. The absorption cores on the peaks of the emission profiles Mg II k and h are mainly of interstellar origin and, only partly, due to self-absorption in the star's chromosphere.

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