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Record Details

Record 69 of 946
The Mg II h and k interstellar lines in the spectrum of the G-type giant HD 156854
External Online Source: doi:10.1086/132780
Author and Affiliation:
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)
Abstract: The 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.
Publication Date: Dec 01, 1990
Document ID:
19910036183
(Acquired Nov 28, 1995)
Accession Number: 91A20806
Subject Category: ASTROPHYSICS
Document Type: Journal Article
Publication Information: Astronomical Society of the Pacific, Publications (ISSN 0004-6280); 102; 1387-139
Publisher Information: United States
Financial Sponsor: NASA; United States
Organization Source: Byurakan Observatory; Mount Aragatz, Ussr
NASA Goddard Space Flight Center; Greenbelt, MD, United States
Cornell Univ.; Ithaca, NY, United States
Erevan Karl Marx Polytechnic Inst.; Erevan, Armenia
Description: 5p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: G STARS; GIANT STARS; INTERSTELLAR MATTER; MAGNESIUM; STELLAR SPECTRA; ABSORPTION SPECTRA; ASTRONOMICAL SPECTROSCOPY; HYDROGEN; IUE; SPECTRAL LINE WIDTH; STELLAR ATMOSPHERES
Imprint And Other Notes: Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 102, Dec. 1990, p. 1387-1391. Research supported by the National Astronomy and Ionosphere Center.
Miscellaneous Notes: Research supported by the National Astronomy and Ionosphere Center
Availability Source: Other Sources
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