An upper limit on interstellar C IV in the spectrum of gamma-2 Velorum

Details An upper limit on interstellar C IV in the spectrum of gamma-2 Velorum An upper limit on interstellar C IV in the spectrum of gamma-2 Velorum

Oct 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975obs....95..210l&link_type=abstract

The Observatory, vol. 95, Oct. 1975, p. 210, 211.

Physics

4

Binary Stars, Carbon, Interstellar Matter, Stellar Spectra, Abundance, Interstellar Extinction, Ionization, Nebulae, Spectral Line Width

Scientific paper

An upper limit on the column density of C IV along the line of sight to gamma-2 Vel is derived from upper limits placed on the equivalent widths of the interstellar C IV doublet with rest wavelengths at 1548.20 A and 1550.77 A. A lower limit of 250,000 K is calculated for the electron temperature of O VI emitting regions by combining the C IV results with a measurement of the column density of interstellar O VI for the same star and using calculations for the relative ionization of some abundant elements as a function of electron temperature in a low-density plasma. Since gamma-2 Vel is in the central part of the Gum Nebula, the high temperature suggested by these results is shown to support the idea that a high-temperature phase of the interstellar medium, possibly maintained by supernova explosions, may exist.-

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