A survey of high-velocity interstellar ions

Details A survey of high-velocity interstellar ions A survey of high-velocity interstellar ions

Sep 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...216..408c&link_type=abstract

Astrophysical Journal, Part 1, vol. 216, Sept. 1, 1977, p. 408-413.

Astronomy and Astrophysics

Astrophysics

43

Absorption Spectra, Interstellar Extinction, Ion Motion, Stellar Spectrophotometry, Velocity Distribution, Abundance, B Stars, Carbon, H Ii Regions, Interstellar Gas, Nitrogen, O Stars, Silicon

Scientific paper

Results are reported for a survey of the velocity structure in the absorption lines of a number of interstellar species for 30 lines of sight. Of six species chosen for presentation, N I and excited C II emphasize the distribution of neutral interstellar gas and circumstellar H II regions; N II, C II, C III, and Si III show, in addition, the velocity distribution of a previously unidentified type of interstellar gas, with an ionization temperature in the range 20,000 to 100,000 K. High-velocity components of this latter type are seen in a number of stars. Strong Si III and C III absorption at LSR velocities as large as -80 to -120 km/s is observed in five Orion stars. Collisional ionization is probably a dominant factor in producing the inferred ionization temperatures, although photoionization may be important in some cases.

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