Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...18311414b&link_type=abstract
American Astronomical Society, 183rd AAS Meeting, #114.14; Bulletin of the American Astronomical Society, Vol. 25, p.1464
Astronomy and Astrophysics
Astronomy
Scientific paper
Data for interstellar features seen in the spectrum of alpha Gru (B7 IV; d = 26 pc) have recently been obtained by the Goddard High Resolution Spectrograph aboard the Hubble Space Telescope. These data have been acquired using both the G160M medium (R ~ 25,000) and Echelle-B high (R ~ 80,000) spectral resolution configurations. These data are of high signal-to-noise ratios, ranging from 100 to 300. This line-of-sight (l=350(o) , b=152(o) ) intersects the main body of the Local Cloud and the detection of excited fine-structure absorption in C II lambda 1335.7 indicates particle number densities in excess of ~ 5 cm(-3) , much higher than the n ~ 0.1 cm(-3) deduced at the Sun. These data also show the first detection of both interstellar C I lambda 1657 and C IV lambda lambda 1548,1550 in the local ISM. The detection of C IV is inconsistent with photoionization from the hot stars of the nearby Sco-Cen association and with thermal conduction in a cloud interface. The most likely explanation implies that the C IV is formed in gas still in a recombination phase. Such ionized gas should be present due to the recent supernova event (10(5-6) yrs) that gave rise to the local Loop I radio structure.
Bruhweiler Fred C.
Lyu Cheng-Hsuan
Perry Gretchen
Smith Matthew A.
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