The interstellar material in front of Chi Ophiuchi. I - Optical observations

view Abstract Citations (36) References (30) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The interstellar material in front of chi Ophiuchi. I. Optical observations. Frisch, P. C. Abstract Optical observations of the interstellar material in front of Chi Oph are discussed. The main interstellar cloud is made up of several regions with velocities between -6 and -12 km/s (heliocentric). Both CH and CH(+) are found within this feature, but with central velocities which differ by 2 km/s. Another cloud, with a velocity of -26 km/s, contains relatively strong Ca(+) lines. It has a ratio between Ca(+) and Na(0) column densities that is appropriate for 'high-velocity' clouds. Calcium, iron, and sodium column densities are used to estimate an average electron density for the line of sight, as well as for each cloud. The abundances of CH and CH(+), and the absence of CN, are analyzed in terms of current theories about their origin. Publication: The Astrophysical Journal Pub Date: January 1979 DOI: 10.1086/156754 Bibcode: 1979ApJ...227..474F Keywords: Absorption Spectra; Abundance; Interstellar Extinction; Interstellar Gas; Stellar Spectra; Astronomical Spectroscopy; Calcium; Electron Density (Concentration); Iron; Line Spectra; Sodium; Astrophysics; Absorption Lines:Interstellar Clouds; Electron Densities:Interstellar Clouds; Interstellar Clouds:Element Abundances; Interstellar Clouds:Velocities full text sources ADS | data products SIMBAD (1) Related Materials (1) Part 2: 1980ApJ...241..697F