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Detection of narrow C 4 and Si 4 absorption features in spectra of stars within 200 pc f the Sun (1984)

Beckman, J. E. ; Morossi, C. ; Franco, M. ; [et al.]

In: CASI

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Publication Date: 2014-09-16

Description: Detection 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.

Keywords: ASTROPHYSICS

Type: NASA. Goddard Space Flight Center Local Interstellar Medium, No. 81; p 185-188

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