Highly ionized atoms toward HD 93521

Details Highly ionized atoms toward HD 93521 Highly ionized atoms toward HD 93521

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...391l..41s&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 391, no. 1, May 20, 1992, p. L41-L44.

Astronomy and Astrophysics

Astrophysics

31

Absorption Spectra, Hubble Space Telescope, Interstellar Matter, Ionized Gases, O Stars, Astronomical Models, Interstellar Extinction, Line Spectra

Scientific paper

Results are reported from the HST High Resolution Spectrograph observations of absorption features of C IV and Si IV in the spectrum of the high-latitude O star HD 93521 (l = 183 deg; b = 62 deg). A comparison of Si IV and C IV profiles showed that the FWHM of both features is about 50 km/sec, in contrast to the 7 km/sec found for one of the several S II features. The line centers for C IV and Si IV are at v = -67 km/sec and -60 km/sec, respectively. As the interval velocity decreases from 90 to 50 km/sec, the Si IV/C IV ratio of the column density per unit velocity interval increases from about 0.2 to 0.4. The result is qualitatively consistent with a fountain model of Shapiro and Benjamin (1991) if the slower gas has cooled and recombined more than the faster gas.

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