Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...213...43y&link_type=abstract
Astrophysical Journal, Part 1, vol. 213, Apr. 1, 1977, p. 43-51.
Astronomy and Astrophysics
Astrophysics
54
Absorption Spectra, Gas Temperature, Interstellar Extinction, Interstellar Gas, Oao 3, Satellite Observation, Astronomical Spectroscopy, Hydrogen, Ion Temperature, Line Shape, Nitrogen Atoms, Oxygen Spectra, Stellar Spectra, Sulfur
Scientific paper
More detailed scans of ions expected in interstellar absorption at temperatures of 100,000 to 1 million K have been made with Copernicus in five stars: Alpha Vir, Beta Cen, Lambda Sco, Mu Col, and HD 28497. Preliminary data show that the absorption due to O VI is stationary compared with the velocities of stellar absorption in the spectrum of the spectroscopic binary Lambda Sco, thus demonstrating its nonstellar nature. Ionization temperatures interpreted using steady-state or time-dependent assumptions yield values of 280,000 to 700,000 K. There is some evidence that a range of temperatures consistent with this spread may in fact exist in Alpha Vir. For this limited sample of data, there is no clear evidence for a generic association of low-column-density H2 and the O VI absorption. It is concluded that the O VI absorption refers to regions with temperatures exceeding 250,000 K. The only UV diagnostic for the gas appears to be the O VI features, though C IV may be useful in some cases.
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