Bibcode
Molaro, P.; Beckman, J. E.; Franco, M.; Morossi, C.; Ramella, M.
Bibliographical reference
In NASA. Goddard Space Flight Center Local Interstellar Medium, No. 81 p 185-188 (SEE N85-15539 06-90)
Advertised on:
11
1984
Citations
6
Refereed citations
5
Description
Detection of narrow (δλ < 0.5 Å) absorption
features in C IV at λλ1548 and 1550 have been made in the
spectra of 4 late B dwarfs within 200 pc of the sun; the Si IV doublet
at λλ1393 and 1403 shows up in two of them. The authors
argue 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 (cf. Bruhweiler
et al. 1980) in the 50,000K range forming the interfaces between cooler
H I clouds and the ambient medium at coronal temperatures. The
technique, using late B rapid rotators, is useful for LISM probing of
this kind.