High-Resolution Spectra of Ordinary Cool Stars in the K Band

Abstract

We present an atlas of high-resolution (R ≥ 45,000) 2.02-2.41 μm spectra of 12 representative stars, a sunspot, three Mira variables, and a carbon star. The stars sample MK spectral types from about early-G to about mid-M, with luminosity classes dwarf to supergiant. The Mira variables are one each of M, S, and C types. All of the spectra have been corrected for atmospheric absorption and have the major spectral features labeled with responsible absorbers. Spectra and line lists are also available on the AAS CD-ROM series Vol. 7. The 2.0-2.4 μm -includes molecular vibration-rotation transitions from the CO first overtone, HF fundamental, and several bands of H2O as well as the CN red system, an electronic transition. The relative contribution of H2O versus CN in cool star spectra is discussed. Atomic features include clean measurable lines of H, C, Na, Mg, Al, Si, S, Ca, Sc, Ti, V, and Fe. We discuss temperature and luminosity spectral indicators and the effects of blending on these indicators at lower spectral resolution.