The high-ionization and excited-state interstellar lines in the Carina Nebula - A giant H II region in absorption

Details The high-ionization and excited-state interstellar lines in the Carina Nebula - A giant H II region in absorption The high-ionization and excited-state interstellar lines in the Carina Nebula - A giant H II region in absorption

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...276..524w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 276, Jan. 15, 1984, p. 524-532.

Astronomy and Astrophysics

Astrophysics

35

H Ii Regions, Interstellar Matter, Nebulae, Abundance, Electron Density (Concentration), Ionization, Line Spectra, Radial Velocity, Ultraviolet Spectra

Scientific paper

The dominant component of the highly ionized and excited-state interstellar species seen in the ultraviolet toward stars within the Carina Nebula has been found to have a heliocentric radial velocity of about -30 km/s. This velocity is known to correspond to the near edge of the expanding H II region, as shown by the double optical nebular emission lines and the single He I lambda 3889 nebular absorption line. It is also seen as a (nondominant) component in both the optical and ultraviolet low-ionization interstellar lines, discussed previously. Hence, the Carina Nebula provides a clear case in which the principal high-ionization interstellar features are associated with the hot stars against which they are observed; and a considerable range of absorption lines can provide physical information about the H II region. Also, the weaker zero-velocity, line-of-sight component in the high-ionization species can be measured in this direction relatively free from confusion by the material associated with the stars. There is, in addition, a pervasive high-ionization feature with a velocity of -90 km/s in this region, which has the relatively large value of N(C IV)/N(Si IV) = 4.5.

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