Monthly Archives: June 2016

Energy levels and transition rates for helium-like ions with Z=10-36

R. Si (1,2,3), X.L. Guo (2,3), K. Wang (4), S. Li (5), J. Yan (5,6,7), C.Y. Chen (2,3), T. Brage (1), Y.M. Zou (2,3)   (1) Division of Mathematical Physics, Department of Physics, Lund University, Box 118, SE-221 00 Lund, … Continue reading

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Model uncertainties of local-thermodynamic-equilibrium K-shell spectroscopy

T. Nagayama (a) , J.E. Bailey (a), R.C. Mancini (b), C.A. Iglesias (c), S.B. Hansen (a), C. Blancard (d), H.K. Chung (e), J. Colgan (f), Ph. Cosse (d), G. Faussurier (d), R. Florido (g), C.J. Fontes (f), F. Gilleron (d), I.E. Golovkin (h), D.P. Kilcrease (f), G. Loisel (a), J.J. … Continue reading

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Si K Edge Structure and Variability in Galactic X-Ray Binaries

Norbert S. Schulz, Lia Corrales, Claude R. Canizares Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA  We survey the Si K edge structure in various absorbed Galactic low-mass X-ray binaries (LMXBs) to study … Continue reading

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Very Large Telescope deep echelle spectroscopy of Galactic planetary nebulae NGC 6153, M 1-42 and Hf 2-2

Ian A. McNabb (1), Xuan Fang (2,3,4), Xiaowei Liu (1,5) (1) Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China. (2) Instituto de Astrofísica de Andalucía – CSIC, Glorieta de la Astronomía, s/n. E-18008 Granada, Spain. (3) Laboratory … Continue reading

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The abundance discrepancy factor and t^2 in nebulae: are non-thermal electrons the culprits?

Ferland, G. J.; Henney, W. J.; ODell, C. R.; Peimbert, M. (1) Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506, USA. (2) Centro de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México, Apartado Postal 3-72, 58090 Morelia, Michoacán, México. (3) Department of Physics and … Continue reading

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On the detectability of CO molecules in the Interstellar Medium via X-ray spectroscopy

Katerine Joachimi (1), Efraín Gatuzz (1,2), Javier A. Garcia (3), Timothy R. Kallman (4) (1) Escuela de Física, Facultad de Ciencias, Universidad Central de Venezuela, PO Box 20632, Caracas 1020A, Venezuela. (2) Max-Planck-Institut fur Astrophysik, 85741 Garching bei Munchen, Germany. … Continue reading

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Chromospheric Models and the Oxygen Abundance in Giant Stars

Dupree, A. K.; Avrett, E. H.; Kurucz, R. L. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA Realistic stellar atmospheric models of two typical metal-poor giant stars in Omega Centauri, which include a chromosphere (CHR), influence the formation of optical lines of O I: the forbidden … Continue reading

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New database of molecular line lists lifts the veil on the composition of exoplanet atmospheres

Now that scientists have identified a very high number of exoplanets, the next step—and probably the most exciting one—will consist in shortlisting actual Earth-like planets. Doing this requires an enormous quantity of spectroscopic data which the EXOMOL project just so … Continue reading

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The CHIANTI database, a consistency check on the accuracy of the stored cross-section values in He I to O I isoelectronic sequence ions

U Feldman Artep, Inc., Ellicott City, MD 21042, USA (ufeldman@verizon.net) CHIANTI is an atomic database with software for calculating emission properties. It is extensively used in deriving the atomic properties of spectra recorded from astrophysical and low density laboratory plasmas. … Continue reading

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Hyperfine-dependent gf-values of Mn I Lines in the 1.49-1.80 μm H Band

Andersson, M.; Grumer, J.; Ryde, N.; Blackwell-Whitehead, R.; Hutton, R.; Zou, Y.; Jönsson, P.; Brage, T. The three Mn I lines at 17325, 17339, and 17349 Å are among the 25 strongest lines (log (gf) > 0.5) in the H … Continue reading

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