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Intersstellar absorption lines between 2000 and 3000 A in nearby stars observed with BUSSSpectra obtained between 2000 and 3000 A with the Balloon Borne Ultraviolet Spectrophotometer (BUSS) payload were examined for interstellar absorption lines. In bright stars, with spectral types between O9V and F5V, such lines were measured of Mg I, Mg II, Cr II, Mn II, Fe II and Zn II, with Cr II and Zn II data of especially high quality. Column densities were derived and interstellar abundances were determined for the above species. It was found that metal depletion increases with increasing E(B-V); Fe was most affected and Zn showed a small depletion for E(B-V) greater than 0.3 towards Sco-Oph. The metal column densities, derived for Alpha-And, Kappa-Dra, Alpha-Com, Alpha-Aql, and 29 Cyg were used to infer N(H I). It was shown that the ratio of Mg I to Na I is instrumental in determining the ionization structure along each line of sight. The spectra of Aql stars confirms the presence of large gas densities near Alpha-Oph. Moreover, data indicated that the Rho-Oph N(H I) value needs to be altered to 35 x 10 to the 20th/sq cm, based on observed ion ratios and analysis of the Copernicus L-alpha profile.
Document ID
19860050280
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
De Boer, K. S.
(Tuebingen Univ. Germany)
Lenhart, H.
(Tuebingen, Univesitaet West Germay, United States)
Van Der Hucht, K. A.
(Tuebingen Univ. Germany)
Kamperman, T. M.
(Laboratorium voor Ruimteonderzoek Utrecht, Netherlands)
Kondo, Y.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 12, 2013
Publication Date
March 1, 1986
Publication Information
Publication: Astronomy and Astrophysics
Volume: 157
Issue: 1 Ma
ISSN: 0004-6361
Subject Category
Astrophysics
Accession Number
86A35018
Funding Number(s)
CONTRACT_GRANT: DFG-GR438/14
Distribution Limits
Public
Copyright
Other

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