HD 76151 and Sun near-infrared spectroscopy

This study presents a new atomic line list covering a broad spectral range (1-2.5um; YJHK bands) for iron (Fe) and {alpha}-elements (Ca, Mg, Ti, Si) to improve stellar parameter determination using near-infrared (NIR) spectroscopy. We highlight the limitations of existing line lists, stemming primarily from inconsistencies in oscillator strengths for ionized iron lines within the Apache Point Observatory Galactic Evolution Experiment DR17.

The line list was validated using the high-resolution and high-quality disk-center NIR spectra of the Sun and its solar analog HD 76151. As a result of the spectroscopic analyses, the effective temperature of HD 76151 was calculated as 5790+/-170K, surface gravity as 4.35+/-0.18cgs, metal abundance as 0.24+/-0.09dex, and microturbulence velocity of 0.30^+0.5^_-0.3_km/s by combining the optical and NIR line lists. A comparison of the model atmospheric parameters calculated for HD 76151 with the PARSEC isochrones resulted in a stellar mass of , radius 1.125^+0.035^_-0.011_R_{sun}_ , and an age of 5.5^+2.5^_-2.1^Gyr.