CCD observations of additional interstellar lines in stars associated with the VELA Remnant and Eta Carinae nebulosity

Details CCD observations of additional interstellar lines in stars associated with the VELA Remnant and Eta Carinae nebulosity CCD observations of additional interstellar lines in stars associated with the VELA Remnant and Eta Carinae nebulosity

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103.1346w&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 103, April 1992, p. 1346-1356.

Astronomy and Astrophysics

Astronomy

18

Interstellar Matter, Line Spectra, Nebulae, Supernova Remnants, Charge Coupled Devices, Electron Density (Concentration), Molecular Ions, Stellar Spectra, Stellar Winds

Scientific paper

Nine stars from the Vela Remnant and seven stars in the Eta Carinae complex are examined with CCD spectrograms with high signal-to-noise ratios for data regarding the optical interstellar lines. These data are supplemented by observations of objects with known high-velocity components and substantial interstellar Ti II lines. The CCD spectrograms have signal-to-noise ratios of 100-300, a 2-pixel resolving power of 20,000, and cover features of Na I, Ti II, Ca I, CH(+), and CH in the 3200-4400-A range. The Ca I line confirms the high H density in Vela, and the Ti II lines show evidence of shock-induced grain evaporation. Weak shocks are thought to contribute to the CH(+) component, and a high H I density in some clouds is inferred from the CH line. The high H I density is supported by IUE data on Ca I and on the fine-structure carbon lines. The data point to a significant difference in spectroscopic morphology between the two groups of stars, and the need for theoretical support is underscored.

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