F, G, K, M SPECTRAL STANDARDS IN THE Y BAND (0.95-1.11 μm)

摘要

We take advantage of good atmospheric transparency and the availability of high-quality instrumentation in the1 Am near-infrared atmospheric window to present a grid of F, G, K, and M spectral standards observed at highspectral resolution (R ti 25,000). In addition to a spectral atlas, we present a catalog of atomic line absorptionfeatures in the 0.95-1.11 μm range. The catalog includes a wide range of line excitation potentials, from 0-13eV, arising from neutral and singly ionized species, most frequently those of Fe t and Tit at low excitation, Cr t,Fe I, and Si i at moderate excitation, and C I, SI, and Sit having relatively high excitation. The spectra also includeseveral prominent molecular bands from CN and FeH. For the atomic species, we analyze trends in the excitationpotential, line depth, and equivalent width across the grid of spectroscopic standards to identify temperature andsurface gravity diagnostics near 1 sm. We identify the line ratios that appear especially useful for spectral typingas those involving TiI and CI or S t, which are temperature sensitive in opposite directions, and Sr It, which isgravity sensitive at all spectral types. ASCII versions of all spectra are available in the online version of the journal.