M giants with IGRINS - IV. Identification and characterisation of a NIR line of the s-element barium

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Volume 690 (October 2024)

A&A, 690 (2024) A226

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Table 3

Atomic line data for the Ba I 6s5d ³D → 6s6p ³P^o fine structure transitions.

Lower term	Upper term	Wavelength^(a) in Air (Å)	Excitation Energy (eV)	log g f⁽^b⁾	Rel. Int.^(a)	Rel. line strength $g f \cdot e^{χ e x c / k T}$ $\[g f \cdot e^{\chi \mathrm{exc} / \mathrm{k}T}\]$	Comment
6s5d ³D₁	6s6p $^{3} P_{2}^{o}$ $\[{ }^3 \mathrm{P}_2^o\]$	22311.47	1.120	−2.307	560	0.013	too weak
6s5d ³D₂	6s6p $^{3} P_{2}^{o}$ $\[{ }^3 \mathrm{P}_2^o\]$	23253.56	1.143	−1.172	9900	0.19	observed
6s5d ³D₃	6s6p $^{3} P_{2}^{o}$ $\[{ }^3 \mathrm{P}_2^o\]$	25514.88	1.190	−0.460	10000	1	beyond IGRINS coverage
6s5d ³D₁	6s6p $^{3} P_{1}^{o}$ $\[{ }^3 \mathrm{P}_1^o\]$	27749.72	1.120	−1.229	blend	0.14	between K and L bands
6s5d ³D₂	6s6p $^{3} P_{1}^{o}$ $\[{ }^3 \mathrm{P}_1^o\]$	29222.20	1.143	−0.791	213	0.44	between K and L bands
6s5d ³D₁	6s6p $^{3} P_{0}^{o}$ $\[{ }^3 \mathrm{P}_0^o\]$	30931.59	1.120	−1.149	402	0.19	L band

Notes. ^(a)Measured by Karlsson & Litzén (1999) and reported in the NIST ADS database (Martin et al. 2000). ^(b)Oscillator strengths as given by Kurucz (2017).

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