Atomic line shapes in stellar spectra

2008 ◽  
Author(s):  
John F. Kielkopf ◽  
Nicole F. Allard ◽  
Marco Antonio Gigosos ◽  
Manuel Ángel González
Keyword(s):  
Atomic Line ◽  
Stellar Spectra ◽  
Line Shapes

Controlling Atomic Line Shapes

Science ◽  
2013 ◽  
Vol 340 (6133) ◽  
pp. 694-695 ◽  
Author(s):  
C. D. Lin ◽  
W.-C. Chu
Keyword(s):  
Atomic Line ◽  
Line Shapes

On the role of Dicke narrowing in the formation of atomic line shapes in the optical domain

2003 ◽  
Vol 36 (19) ◽  
pp. 3985-3998 ◽  
Author(s):  
D Lisak ◽  
A Bielski ◽  
R Ciury o ◽  
J Domys awska ◽  
R S Trawi ski ◽  
...  
Keyword(s):  
Atomic Line ◽  
Line Shapes ◽  
Optical Domain

Including all the lines: data releases for spectra and opacities

2017 ◽  
Vol 95 (9) ◽  
pp. 825-827 ◽  
Author(s):  
Robert L. Kurucz
Keyword(s):  
Energy Levels ◽  
Model Atmosphere ◽  
Stellar Atmosphere ◽  
Progress Report ◽  
Atomic Line ◽  
Radiation Hydrodynamics ◽  
Stellar Spectra ◽  
Stellar Interior ◽  
Laboratory Source ◽  
Spectrum Synthesis

I present a progress report on including all the lines in the line lists, including all the lines in the opacities, and including all the lines in the model atmosphere and spectrum synthesis calculations. The increased opacity will improve stellar atmosphere, pulsation, stellar interior, asteroseismology, nova, supernova, and other radiation-hydrodynamics calculations. At present I have produced atomic line data for computing opacities for 544 million lines for elements up through Zn. Of these, 2.11 million lines are between known energy levels so have good wavelengths for computing spectra. Work is continuing on heavier elements. I also report on using stellar spectra as the laboratory source for extending analyses to higher energy levels. Data for each ion and merged line lists are available on my website kurucz.harvard.edu .

scholarly journals The Belgian repository of fundamental atomic data and stellar spectra (BRASS)

2018 ◽  
Vol 612 ◽  
pp. A60 ◽  
Author(s):  
M. Laverick ◽  
A. Lobel ◽  
T. Merle ◽  
P. Royer ◽  
C. Martayan ◽  
...  
Keyword(s):  
Spectral Lines ◽  
Oscillator Strengths ◽  
Atomic Line ◽  
Atomic Data ◽  
Stellar Spectra ◽  
Line List ◽  
The Impact ◽  
Cross Match ◽  
Atomic Parameters ◽  
Non Parametric

Context. Fundamental atomic parameters, such as oscillator strengths, play a key role in modelling and understanding the chemical composition of stars in the Universe. Despite the significant work underway to produce these parameters for many astrophysically important ions, uncertainties in these parameters remain large and can propagate throughout the entire field of astronomy. Aims. The Belgian repository of fundamental atomic data and stellar spectra (BRASS) aims to provide the largest systematic and homogeneous quality assessment of atomic data to date in terms of wavelength, atomic and stellar parameter coverage. To prepare for it, we first compiled multiple literature occurrences of many individual atomic transitions, from several atomic databases of astrophysical interest, and assessed their agreement. In a second step synthetic spectra will be compared against extremely high-quality observed spectra, for a large number of BAFGK spectral type stars, in order to critically evaluate the atomic data of a large number of important stellar lines. Methods. Several atomic repositories were searched and their data retrieved and formatted in a consistent manner. Data entries from all repositories were cross-matched against our initial BRASS atomic line list to find multiple occurrences of the same transition. Where possible we used a new non-parametric cross-match depending only on electronic configurations and total angular momentum values. We also checked for duplicate entries of the same physical transition, within each retrieved repository, using the non-parametric cross-match. Results. We report on the number of cross-matched transitions for each repository and compare their fundamental atomic parameters. We find differences in log(gf) values of up to 2 dex or more. We also find and report that ~2% of our line list and Vienna atomic line database retrievals are composed of duplicate transitions. Finally we provide a number of examples of atomic spectral lines with different retrieved literature log(gf) values, and discuss the impact of these uncertain log(gf) values on quantitative spectroscopy.

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