NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Detection of narrow C 4 and Si 4 absorption features in spectra of stars within 200 pc f the SunDetection of narrow (Beta lambda 0.5 A) absorption features in C 4 at lambda lambda 1548 and 1550 have been made in the spectra of 4 late B dwarfs within 200 pc of the Sun; the Si4 doublet at lambda lambda 1393 and 1403 shows up in two of them. It is argued that it is difficult to account for the strengths, widths, shapes, and C IV/Si IV ratios in terms consistent with a circumstellar origin except possibly for an asymmetric C IV component in one star (HD 185037). The most probable source is semi-torrid gas in the 50,000 K range forming the interfaces between cooler H 1 clouds and the ambient medium at coronal temperatures. Late B rapid rotators are used for local interstellar medium probing of this kind.
Document ID
19850007255
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Molaro, P.
(Osservatorio Astronomico Trieste, Italy)
Beckman, J. E.
(Queen Mary Coll. London, United States)
Franco, M.
(Inst. Astronomia y Fisica del Espacia Trieste, Italy)
Morossi, C.
(Osservatorio Astronomico Trieste, Italy)
Ramella, M.
(Osservatorio Astronomico)
Date Acquired
August 12, 2013
Publication Date
November 1, 1984
Publication Information
Publication: NASA. Goddard Space Flight Center Local Interstellar Medium, No. 81
Subject Category
Astrophysics
Accession Number
85N15564
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Document Inquiry

Available Downloads

There are no available downloads for this record.
No Preview Available