WINERED high-resolution near-infrared line catalog: A-type star

TL;DR

This paper presents a high-resolution near-infrared line catalog for an A-type star, identifying numerous weak lines for the first time, aiding spectral analysis and telluric correction.

Contribution

It provides a new, detailed line catalog for A-type stars in the near-infrared, including many lines identified for the first time with high-resolution spectra.

Findings

Detected 155 absorption features in the spectrum.

Compiled a catalog of 219 atomic lines.

Identified many weak lines for the first time in an A-type star.

Abstract

We present a catalog of absorption lines in the z', Y, and J bands that we identified in 21 Lyn, a slowly rotating A0.5 V star. We detected 155 absorption features in the high-resolution (0.90-1.35 um, R = 28,000) spectrum obtained with the WINERED spectrograph after the telluric absorption was carefully removed using a spectrum of a B-type star as a telluric standard. With a visual comparison with synthetic spectra, we compiled a catalog of 219 atomic lines for the 155 features, some of which are composed of multiple fine structure lines. The high-quality WINERED spectrum enabled us to detect a large number of weak lines down to ~1% in depth, which are identified for an A-type star for the first time. The catalog includes the lines of H, C, N, O, Mg, Al, Si, S, Ca, Fe, and Sr. These new lines are expected to be useful for spectral classification and chemical abundance analyses, whilst the line list is useful for observers who plan to use A-type stars as telluric standards because it is necessary to distinguish between stellar lines and telluric absorption lines in high-resolution spectra. ASCII versions of the spectra are available in the online version of the journal.