A cool giant with a circumstellar cloud

descriptionPublicationkeyboard_double_arrow_right Article 01 Jan 1991 English Publisher:Springer Science and Business Media LLCJournal:Astrophysics and Space Science, volume 176, pages 61-68 (issn: 0004-640X, eissn: 1572-946X,

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Authors: Gurzadyan, G. A.; Kondo, Y.; Ohanesyan, J. B.; Terzian, Yervant; Perez, Mario R.;

doi: 10.1007/bf00643077

A cool giant with a circumstellar cloud

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Abstract

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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