A spectroscopic atlas of the A7 Ib supergiant ι Carinae in the near-IR

A spectroscopic atlas of the A7 Ib supergiant ι Carinae in the near-IR

M. Kondrak, N. Przybilla, K. Zwintz, the CRIRES-POP collaboration and the BRITE Team

High-quality spectral atlases provide the basis for the exploration of the line features in stellar spectra and provide benchmarks for the comparison of models with observations. Currently, we face a dearth of high-resolution spectral atlases of the near-IR wavelength range, with only two such atlases available, for the Sun and for Arcturus. The CRIRES-POP project aims at making available high-quality atlases covering the 1-5μm range for strategic targets throughout the Hertzsprung-Russell diagram. Here, we discuss the preparation of a high-resolution (R≈100 000), high-signal-to-noise ratio (SNR>200) near-IR spectral atlas of the A7 Ib supergiant ι Car. Using BRITE-Constellation data we find that the star is not variable, facilitating a meaningful spectral atlas to be constructed from nearly 200 spectral exposures collected throughout a year of service observations with CRIRES on the ESO VLT. Emphasis is given on the different reduction steps in the atlas preparation, and on problems encountered in the process.

Proceedings of the Polish Astronomical Society, vol. 5, 240-246 (2017)

Download full article as PDF file: