Measurements of Transition Probabilities of some C I and O I Spectral Lines in the Near Infrared

Multicomposition of Er3+-Yb3+codoped tellurite oxide, TeO2-ZnO-PbO-TiO2-Na2O glass has been investigated. Detailed spectroscopic study of the Judd-Ofelt analysis has been performed from the measured absorption spectrum in order to obtain the intensity parameters Ωt(t=2, 4, 6). The calculated Ωtvalues were then utilized in the determination of transition probabilities, radiative lifetimes and branching ratios of the Er3+transitions between theJ(upper)-J(lower) manifolds. Both visible upconversion and near-infrared spectra were characterized under the 980 nm laser diode excitation at room temperature.

Download Full-text

Effects of fast rotation on the wind of Luminous Blue Variables

Proceedings of the International Astronomical Union ◽

10.1017/s1743921311009975 ◽

2010 ◽

Vol 6 (S272) ◽

pp. 56-61

Author(s):

Jose H. Groh

Keyword(s):

Near Infrared ◽

Rotational Velocity ◽

Spectral Lines ◽

High Resolution Spectroscopy ◽

Luminous Blue Variables ◽

Eta Carinae ◽

Fast Rotation ◽

Long Baseline ◽

Infrared Interferometry ◽

Fast Rotating

AbstractWhile theoretical studies have long suggested a fast-rotating nature of Luminous Blue Variables (LBVs), observational confirmation of fast rotation was not detected until recently. Here I discuss the diagnostics that have allowed us to constrain the rotational velocity of LBVs: broadening of spectral lines and latitude-dependent variations of the wind density structure. While rotational broadening can be directly detected using high-resolution spectroscopy, long-baseline near-infrared interferometry is needed to directly measure the shape of the latitude-dependent photosphere that forms in a fast-rotating star. In addition, complex 2-D radiative transfer models need to be employed if one's goal is to constrain rotational velocities of LBVs. Here I illustrate how the above methods were able to constrain the rotational velocities of the LBVs AG Carinae, HR Carinae, and Eta Carinae.

Download Full-text

Relative transition probabilities of F(I) spectral lines in the visible

Journal of Quantitative Spectroscopy and Radiative Transfer ◽

10.1016/0022-4073(83)90100-0 ◽

1983 ◽

Vol 30 (2) ◽

pp. 187-191 ◽

Cited By ~ 7

Author(s):

V. Lokner ◽

Č. Vadla ◽

V. Vujnović

Keyword(s):

Transition Probabilities ◽

Spectral Lines ◽

Relative Transition

Download Full-text

Experimental transition probabilities for spectral lines of seventy elements :

10.6028/nbs.mono.53 ◽

1962 ◽

Cited By ~ 308

Author(s):

Charles H Corliss ◽

William R Bozman

Keyword(s):

Transition Probabilities ◽

Spectral Lines ◽

Experimental Transition

Download Full-text

Properties of Magnetic Features from the Analysis of Near-Infrared Spectral Lines

Infrared Solar Physics ◽

10.1007/978-94-011-1926-9_48 ◽

1994 ◽

pp. 393-405 ◽

Cited By ~ 1

Author(s):

Sami K. Solanki

Keyword(s):

Near Infrared ◽

Spectral Lines ◽

Infrared Spectral ◽

Magnetic Features

Download Full-text

Properties of Magnetic Features from the Analysis of Near-Infrared Spectral Lines

Symposium - International Astronomical Union ◽

10.1017/s0074180900124660 ◽

1994 ◽

Vol 154 ◽

pp. 393-405

Author(s):

Sami K. Solanki

Keyword(s):

Near Infrared ◽

Velocity Structure ◽

Spectral Lines ◽

The Past ◽

Diagnostic Potential ◽

Theoretical Predictions ◽

Infrared Spectral ◽

Magnetic Features

An overview is given of the structure and the physics of magnetic features in solar plages, as derived from observations of near-infrared lines. First, the diagnostic potential of near-infrared lines is compared with that of lines in the visible and at 12 μm. Then, the results on the magnetic and velocity structure of magnetic features obtained from 1.5 μm lines are described, discussed and compared with results of observations in the visible and with theoretical predictions. Finally, the past and present achievements of near-infrared investigations of Zeeman-split lines are summarized.

Download Full-text