Category Archives: stellar spectroscopy

Excitation and charge transfer in low-energy hydrogen atom collisions with neutral oxygen

Barklem, P. S. Excitation and charge transfer in low-energy O+H collisions is studied; it is a problem of importance for modelling stellar spectra and obtaining accurate oxygen abundances in late-type stars including the Sun. The collisions have been studied theoretically … Continue reading

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New Fe i Level Energies and Line Identifications from Stellar Spectra. II. Initial Results from New Ultraviolet Spectra of Metal-poor Stars

Peterson, Ruth C.; Kurucz, Robert L.; Ayres, Thomas R. The Fe i spectrum is critical to many areas of astrophysics, yet many of the high-lying levels remain uncharacterized. To remedy this deficiency, Peterson & Kurucz identified Fe i lines in … Continue reading

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A study on missing lines in the synthetic solar spectrum near the Ca triplet

Kitamura, Jessica R.; Martins, Lucimara P.; Coelho, Paula Synthetic stellar spectra are extensively used for many different applications in astronomy, from stellar studies (such as in the determination of atmospheric parameters of observed stellar spectra), to extragalactic studies (e.g. as … Continue reading

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Line Identification of Atomic and Ionic Spectra of Holmium in the Near-UV

Part I. Spectrum of Ho I Al-Labady, N.; Özdalgiç, B.; Er, A.; Güzelçimen, F.; Öztürk, I. K.; Kröger, S.; Kruzins, A.; Tamanis, M.; Ferber, R.; Başar, Gö. The Fourier Transform spectra of a Holmium hollow cathode discharge lamp have been … Continue reading

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Improved Cr II log(gf) Values and Abundance Determinations in the Photospheres of the Sun and Metal-poor Star HD 84937

Lawler, J. E.; Sneden, C.; Nave, G.; Den Hartog, E. A.; Emrahoğlu, N.; Cowan, J. J. New emission branching fraction (BF) measurements for 183 lines of the second spectrum of chromium (Cr ii) and new radiative lifetime measurements from laser-induced … Continue reading

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Experimental and theoretical oscillator strengths of Mg I for accurate abundance analysis

Pehlivan Rhodin, A.; Hartman, H.; Nilsson, H.; Jonsson, P. Context. With the aid of stellar abundance analysis, it is possible to study the galactic formation and evolution. Magnesium is an important element to trace the alpha-element evolution in our Galaxy. … Continue reading

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Hyperfine structure and isotope shifts in Mo II

S.D. Rosner, R.A. Holt We have applied fast-ion-beam laser-fluorescence spectroscopy to measure the hyperfine structures of seven even-parity and six odd-parity levels in Mo II and the isotope shifts of nine transitions in the wavelength range 424.5–443.4 nm. These are … Continue reading

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Systematic non-LTE study of the -2.6 < [Fe/H] < 0.2 F and G dwarfs in the solar neighbourhood. II. Abundance patterns from Li to Eu

Zhao, G.; Mashonkina, L.; Yan, H. L.; Alexeeva, S.; Kobayashi, C.; Pakhomov, Yu.; Shi, J. R.; Sitnova, T.; Tan, K. F.; Zhang, H. W.; Zhang, J. B.; Zhou, Z. M.; Bolte, M.; Chen, Y. Q.; Li, X.; Liu, F.; Zhai, … Continue reading

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3D NLTE analysis of the most iron-deficient star, SMSS0313-6708

Nordlander, Thomas; Amarsi, Anish M.; Lind, Karin; Asplund, Martin; Barklem, Paul S.; Casey, Andy R.; Collet, Remo; Leenaarts, Jorrit Models of star formation in the early universe depend on the details of accretion, fragmentation and radiative feedback. Different simulations predict … Continue reading

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Non-LTE line formation of Fe in late-type stars – III. 3D non-LTE analysis of metal-poor stars

Amarsi, A. M.; Lind, K.; Asplund, M.; Barklem, P. S.; Collet, R. AA(Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 2611, Australia anish.amarsi@anu.edu.au), AB(Max Planck Institute für Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany; Theoretical Astrophysics, Department of … Continue reading

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