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The Mg II h and k interstellar lines in the spectrum of the G-type giant HD 156854The results of the measurements and analysis of the IUE observations of the 2800 Mg II doublet in the spectrum of HD 156854, a G9 III star, are presented. The relative power of the magnesium chromosphere, R(Mg) = 0.00001, is in agreement with the known data for giants of the same class. The emission profiles of this doublet present absorption cores, which are of interstellar origin. Taking into account the interstellar depletion of Mg, the derived density of interstellar hydrogen is n(H) = 0.001/cu cm, which agrees with the conclusion (Paresce 1984) about the possibility of large hydrogen concentrations in some directions of the Galaxy far from the sun.
Document ID
19910036183
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Gurzadian, G. A.
(Biurakanskaia Astrofizicheskaia Observatoriia Byurakan, Armenian SSR, United States)
Cholakian, V. G.
(Erevanskii Politekhnicheskii Institut, Yerevan, Armenian SSR, United States)
Kondo, Y.
(Byurakan Observatory Mount Aragatz, Ussr)
Shore, Steven N.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Terzian, Yervant
(Cornell University Ithaca, NY, United States)
Date Acquired
August 15, 2013
Publication Date
December 1, 1990
Publication Information
Publication: Astronomical Society of the Pacific, Publications
Volume: 102
ISSN: 0004-6280
Subject Category
Astrophysics
Accession Number
91A20806
Distribution Limits
Public
Copyright
Other

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