Document Type

Article

Publication Date

2024

DOI

10.3847/1538-4357/ad7af1

Publication Title

The Astrophysical Journal

Volume

975

Issue

2

Pages

180 (1-11)

Abstract

M-type stars are the most abundant stars in our Galaxy. Their visible spectra are characterized by strong TiO and VO absorption bands with occasional ScO bands near 6000–6100 Å. This region corresponds to the A²Π–X²Σ+ band system and can be used to measure the abundance of ScO. In this work, a new Doppler-limited resolution spectrum of ScO obtained in a hollow-cathode experiment is presented. The A²Π–X²Σ+ electronic transition is analyzed with special care dedicated to fitting the A′²Δ(v+2) ∼ A²Π(v) perturbation. Spectroscopic constants of the A²Π(v) states are reported for v ≤ 9, and a partial fit of spectroscopic constants is made for the A′²Δ(v) states 2 ≤ v ≤ 6. The modeled interaction of the two states reproduces the experimental data remarkably well. New equilibrium constants are extracted from the fit. Band strengths are calculated with the help of a scaled transition dipole moment function, previously calculated with ab initio methods. Finally, a line list of the A²Π–X²Σ+ band system is provided, including Einstein A coefficients and oscillator strengths. Using this line list, the spectrum of ScO can be simulated for different temperature and pressure conditions in stellar atmospheres.

Rights

© 2024 The Authors.

Original content from this work may be used under the terms of the https://creativecommons.org/licenses/by/4.0/. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

Comments

Unified Astronomy Thesaurus concepts: Spectral line lists (2082), Laboratory astrophysics (2004).

Original Publication Citation

Lavy, L., Pastorek, A., & Bernath, P. F. (2024). The A²Π-x²Σ⁺ band system of ScO for M-type star spectral analysis. The Astrophysical Journal, 975(2), 1-11, Article 180. https://doi.org/10.3847/1538-4357/ad7af1

ORCID

0000-0003-4572-8612 (Lavy), 0000-0001-7935-8571 (Pastorek), 0000-0002-1255-396X (Bernath)

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