An atlas of interstellar CA II and NA I profiles in the Carina nebula.
Abstract
Optical interstellar absorption line profiles in the spectra of 22 stars within the Carina Nebula, observed using the 4-m echelle spectrograph at resolving powers of 3-6 x 10 to the 4th, are presented. Radial velocities, representative column densities, and equivalent widths are given for resolved velocity components. As many as 12 distinct components spanning several hundred km/s are observed in a single line of sight. Large Ca II/Na I ratios are found for components having velocities greater than 40 km/s. It is noted that one extreme case may correspond to a high-ionization feature associated with a WN-A star. At least two kinds of motions are suggested by the interstellar lines: a systematic expansion of the entire nebula at 15-20 km/s; and smaller scale 'bubbles' or 'bullets' with much higher velocities.
- Publication:
-
The Astrophysical Journal Supplement Series
- Pub Date:
- January 1982
- DOI:
- 10.1086/190772
- Bibcode:
- 1982ApJS...48..145W
- Keywords:
-
- Absorption Spectra;
- Abundance;
- Calcium;
- Interstellar Matter;
- Molecular Clouds;
- Nebulae;
- Sodium;
- Stellar Spectra;
- Cosmic X Rays;
- Kinetic Energy;
- O Stars;
- Radial Velocity;
- Spectral Line Width;
- Spectrograms;
- Stellar Luminosity;
- Stellar Winds;
- Wolf-Rayet Stars;
- Astrophysics