Spectra of the red /2,0/ CN band in 31 G and K giant stars

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Carbon Stars, Cyanogen, G Stars, K Stars, Red Giant Stars, Stellar Spectra, Stellar Spectrophotometry, Abundance, Late Stars, Line Spectra, Nitrogen Ions, Oxygen Ions, Radial Velocity, Spectral Resolution, Stellar Evolution, Telluric Lines, Water Vapor

Scientific paper

As part of a project aimed at determining C, N and O abundances in a number of G and K giant stars, spectra of the red (2,0) CN band have been observed. The observations were carried out with the 1.2 meter telescope at the Dominion Astrophysical Observatory, Victoria. A 120 A was observed with a 1024 Reticon diode array refrigerated by liquid nitrogen at a spectral resolution of 0.25 A. The spectra were calibrated for wavelength, corrected for the influence of telluric water vapour lines, and rectified to a continuum. Tables of equivalent widths for selected (C-12)N and atomic lines are given. The error in an equivalent width is typically + or - 8 m A when compared with independent measurements by others. As a corollary to the water vapor correction procedure, high precision radial velocities (+ or - 0.5 km/s) have been derived.

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